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PT J
AU Ma, YS
He, DF
Cai, XY
Liu, B
AF Ma YongSheng
He DengFa
Cai XunYu
Liu Bo
TI Distribution and fundamental science questions for petroleum geology of marine carbonate in China
SO ACTA PETROLOGICA SINICA
AB The marine carbonate is widely distributed in inland and sea area around China, especially of its occurrence in mainland. The Chinese continent is composed of small-scale cratonic continental blocks, micro-continental blocks, and the intervening orogenic belts. The marine Paleozoic basins, developing upon those cratonic blocks, are characterized by small in scale, differentiated markedly in the basin interior, and modified extensively along the basin margins. The marine carbonates are deeply buried and highly thermal matured owing to the overlying Mesozoic and Cenozoic thick strata with a result of the strong heterogeneity of reservoirs and much complex for oil and gas pool-formation and occurrence. Since the discoveries of Weiyuan Gas Field in 1964 and Jingbian Gas Field in 1989, especially of such giant or super-giant oil and gas fields as Puguang, Yuanba, Tahe, and Anyue found in the recent years, the prospection for petroleum exploration in marine carbonate tends to be much more promising. The long-period exploration discovers the four types of reservoir in marine carbonate such as the reef and shoals, dolomites, karst caves, and fracture zones, which are controlled by the deposition, diagenesis, and tectonic evolution. The reef and shoals, the karst caves along slopes, the dissolution weathering crusts, and the fracture zones all have the potential to being large-scale pool-formed. At present, the on-going study and exploration on marine carbonate is faced to lots of key questions. As for the basic science, it' s involved in the old biocoene, paleo-ecology, paloeclimate, and paleo-geography and its coupling relationships, the genesis of cratonic basin and the mechanism for its tectonic and depositional differentiation, the proto-basin and its evolution, as well as the sedimentary filling, and so on. As far as the oil and gas exploration is concerned, it' s cared about the reconstruction of litho-facies paleo-geography, the description of carbonate platform margin, the delineation of the intra-structure of the platform, the superimposed and modified mechanism for multi-period reservoirs, the classification for karst reservoirs, and the description and evaluation of the heterogeneity carbonate reservoirs. It is needed to explore the linkage between the source rock and reservoir body, the processes for oil and gas pool-formation, the perseverance and adjustment or redistribution, and the principle for oil and gas enrichment and occurrence. The paper put forward to study the marine carbonate from a viewpoint of systematic and dynamic thought, to explore the whole factors and full processes for the "basin formation, diagenesis, reservoir formation, and the pool-formation", delineate the distribution of the paleo-rift trough, the paleo-platform, and the paleo-uplift, to make sure of the location of hydrocarbon source rocks, the distribution of the favorable reservoirs, such as the reef and shoals, dolomite, the along stratified and intervening stratified karst and fracture zones, and their coupling relationships, and to establish the oil and gas pool-formation models conserving to the real data. It will found a basis for the appraisal of oil and gas resource potential and prospection for favorable plays, and helpful for the continual oil and gas discoveries in the marine carbonate around China.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1007
EP 1020
UT WOS:000402585200001
ER  

PT J
AU Ma, YS
Mei, MX
Zhou, RX
Yang, W
AF Ma YongSheng
Mei MingXiang
Zhou RunXuan
Yang Wen
TI Forming patterns for the oolitic bank within the sequence-stratigraphic framework: An example from the Cambrian Series 3 at the Xiaweidian section in the Western Suburb of Beijing
SO ACTA PETROLOGICA SINICA
AB The Cambrian Series 3 in North-China Platform is approximately made up of the Maozhuang, Xuzhuang, Zhangxia and Gushang formations, and the mid- and upper parts of the Series 3 are marked by the large-area development of grainstones of the oolitic grain bank facies that does not conform to the concept of "the platform-margin grain bank" in the standard Wilson model of carbonate facies belts. The sequence-stratigraphic division that is on the basis of the sedimentary-facies successions demonstrates that these strata belonging to the oolitic-grain bank facies generally constitute the late-stage high-stand system tract of the forced-regressive system tract of the third-order depositional sequence and express a particular forming pattern that is responded to the relative sea-level fall; further, this forming pattern of the oolitic-grain bank facies does not fit to the standard model of sequence stratigraphy, in which deposition occurs principally during rise and stillstands of relative sea level and a continuous erosional unconformity develops during sea-level fall. Moreover, in contrast with mudstones and banded micrites belonging to the shelf facies that are formed during the transgressive stage, the oolitic-grain bank with the large-area development formed in the forced-regressive process might represent a new type of diversified Cambrian carbonate platforms, i.e. a carbonate platform that is characteristic of following features: the shallow shelf is mantled by grainy oolitic sediment, flanked seaward by a ramp and landward by tidal flats. Therefore, a particular forming pattern of oolitic-grain banks delegated by the sequence-stratigraphic position within the Cambrian Series 3 at the Xiaweidian section in the Western Suburb of Beijing might implicate a new type of diversified Cambrian carbonate platforms, which will provide an important clue and a thinking approach for the regional tracing and correction, as well as the palaeogeographical reconstruction for the Cambrian Series 3 in the North China Platform.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1021
EP 1036
UT WOS:000402585200002
ER  

PT J
AU He, DF
Ma, YS
Cai, XY
Zhang, J
Zhang, YJ
AF He DengFa
Ma YongSheng
Cai XunYu
Zhang Jian
Zhang YiJie
TI Comparison study on controls of geologic structural framework upon hydrocarbon distribution of marine basins in western China
SO ACTA PETROLOGICA SINICA
AB The marine middle and lower petroliferous associations of Tarim, Sichuan, and Ordos basins in West China are the key areas for oil and gas exploration around the country. To disclose the characteristics of oil and gas distribution is crucial for the on-going exploratory discoveries and the exploration efficiency promotion. Based upon the new discoveries and the new advances in petroleum exploration during the recent years, the paper applied the comparative method to discuss the tectonic controls upon oil and gas occurrence. It is shown that the marine basins, such as Tarim, Sichuan, and Ordos basins, are located in the composite area of the Paleo-Asia Ocean and the Tethys Ocean tectonic domains, and are multi-cycle superimposed basins developed upon the pre-Cambrian crystalline basement. They underwent three extension-compression cycles during the Sinian to Middle Devonian, (Late Devonian-) Middle Carboniferous to Triassic, and Jurassic to Quaternary periods, respectively. Each cycle develops the independent hydrocarbon source-reservoir-cap rock assemblages, characterizing by the excellent source rocks occurred in the differentially subsided areas during extension periods, and the large-scale spreading of the reservoir rocks and the trap associations during compression periods. The basin structures are featured of stratified vertically and faulted blocks horizontally. The basement sub-division played a role in the formation of the above sedimentary proto-type basins. It is demonstrated that the superimposing styles among the proto-type basins controlled the hydrocarbon accumulation strata and accordingly the rich areas and plays. The oil and gas enrichment areas in the basins are formed due to the two constructive tectonic movements such as the Middle Caledonian and the Indo-China, and the two adjustment movements such as the Late Yanshanian (Late Jurassic to Early Cretaceous Period) and the Late Himalayan (Pliocene to Quaternary). It is common for pool-formation in the neo-tectonic period. The marine superimposed basins are entitled of a series of petroliferous beds and intervals, especially of the superimposed boundaries among the proto-type basins proved to be an important area for oil and gas accumulation; and many oil and gas accumulation zones or areas occurring along the uplift belt, the fault zone, the platform marginal zone as well as the litho-facies variation zones. It is concluded that the middle and lower association of the superimposed basins is favorable for the next on-going breakthrough in petroleum exploration.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1037
EP 1057
UT WOS:000402585200003
ER  

PT J
AU Liu, SG
Sun, W
Zhong, Y
Deng, B
Song, JM
Ran, B
Luo, ZL
Han, KY
AF Liu ShuGen
Sun Wei
Zhong Yong
Deng Bin
Song JinMin
Ran Bo
Luo ZhiLi
Han KeYou
TI Evolutionary episodes and their characteristics within the Sichuan marine craton basin during Phanerozoic Eon, China
SO ACTA PETROLOGICA SINICA
AB The Sichuan superimposed basin, located at western China, is founded on the Sichuan marine craton. The Phanerozoic evolution within the Sichuan marine craton can be divided into two episodes. The first episode is from Late Sinian (Edicarian) Epoch to Carboniferous Period, while the second one from Permian Period to Middle Triassic Epoch. Both of the two episodes are characterized with a gentle extensional stage and a subsequent gentle shortening stage. However, there are intense extension and shorting at the correspondent episodes in the margins of the Sichuan marine craton. The beginning of the both gentle extensional stages within the Sichuan marine craton accommodated widespread stable deposits of marine platform facies, (i.e., Upper Sinian Dengying Formation, Middle Permian Qixia and Maokou formations), which were superimposed by subsequent uplifting and erosion with typical karstification. Furthermore, an extensional stage is characterized by the formation of intracratonic sags (e.g., the Early Cambrian Mianyang-Changning sag, the Late Permian to Early Triassic Kaijiang-Liangping sag) with maximum extension at the northwestern part of the craton, decreasing into the center of the craton. It should be noted that the intracratonic sags may be different in sedimentation and geodynamics. For example, the Early Cambrian Mianyang-Changning intracratonic sag is with thick mudstone, indicating of compensation-type filling process, in contrast to the Late Permian to Early Triassic Kaijiang-Liangping sag dominated with thin mudstone as a result of starvation-type filling process. In a gentle shortening stage, it is usually characterized by the formation of paleo-uplifts (i.e., the Caledonian Leshan-Longnvshi paleo-uplift, Indosinian Kaijiang paleo-uplift), of which the maximum highhills located at the southwestern part of the craton, indicating of a geodynamic decrease from the southwest to the center of the craton. In particular, there is a substantial intersection angle between the intracratonic sage and the correspondent paleo-uplift, even to perpendicular. Besides, the areas of the intracratonic sags and the correspondent paleo-uplifts are different. The Early Cambrian Mianyang-Changning sag and Caledonian (Early Paleozoic) Leshan-Longnvshi paleo-uplift are with area of 5. 4 x 10(4)km(2) and 6 x 10(4)km(2), respectively; while the Late Permian to Early Triassic Kaijing-Liangping sag and Indosinian (Triassic) Kaijiang paleo-uplift with area of 2. 0 x 10(4)km(2) and 0. 8 x 10(4)km(2), and the Late Permian to Early Triassic Pengxi-Wusheng sag and Indosinian Luzhou paleo-uplift with area of 2. 0 x 10(4)km(2) and 4. 2 x 10(4)km(2), respectively. The evolutionary characteristics marine craton have controlled the hydrocarbon accumulations and their distributions across the Sichuan superimposed basin.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1058
EP 1072
UT WOS:000402585200004
ER  

PT J
AU Mei, MX
Zhang, R
Li, QY
Jie, L
AF Mei MingXiang
Zhang Rui
Li QiYao
Jie Lei
TI Calcified cyanobacterias within the stromatolotic bioherm for the Cambrian Furongian Series in the northeastern margin of the North-China Platform
SO ACTA PETROLOGICA SINICA
AB The Furongian Series in the northestern margin of the North-China Platform can be subdivided into the Changshan and Fengshan formations, in which three third-order depositional sequences can be discerned on the basis of the depositional trend reflected by the cyclicity of sedimentary-facies successions. These third-order sequences make up of the depositional sequence belonging to the type of a drowned-unconformity,, which are constituted by a generally upward shoaling succession from a condensational succession of deeper-water fine deposits made up by both calcareous mudstones of the shallow-shelf facies and marls of the deep-ramp facies in the lower part to a shallow-water carbonate succession belonging to the mid- and shallow-ramp facies in the upper part. Stromatolitic bioherms that are similar to the microbial reef are typically developed in the forced-regressive system tract of third-order sequence made up of both the Changshan Formation and the lower part of the Fengshan Formation, which represent the typical depositional record that is the response to the third-order relative sea-level falling. Furthermore, micrites and microspars are the fundamental composition for stromatolites making up the stromatolitic bioherm, and some calcified cyanobacteria fossils within these stromatolites are resulted from the calcification of microbial mats that are dominated by cyanobacterias. Importantly, there are lots of "Lithocodium" within those column and domical stromatolites composed by rough lamina, which become an important singles of microbial activities and demonstrate that these stromatolites might be resulted from a sophisticated microbial precipitation together with other calcified cyanobacteria fossils. Lithocodium, one enigmatic cyanobacteria fossil that had been frequently described in Mesozoic microbial carbonates and had been grouped into the Codium belonging to a high-grade green algal, or had been interpreted as a kind of encrust foraminiferas as well as the sponge spicule network, which reflect that its biological affinity have strongly been debated. Therefore, stromatolitic bioherms of the Furongian in the northwestern margin of the North-China Platform provide an important example for the further understand of the building action of microbial reefs or bioherms during " a resuscitate period of microbial carbonate from Cambrian to the Early Ordovician" or " the first episode of the Cyanobacteria Calcification Events in the Phanerozoic", since their particular sequence-stratigraphic position might delegate a record of the forced-regression and their composition of specially calcified microbes might represent an important signal of complex microbial activities during both the growth and forming process of stromatolites.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1073
EP 1093
UT WOS:000402585200005
ER  

PT J
AU Bao, HP
Yang, F
Bai, HF
Wu, CY
Wang, QP
AF Bao HongPing
Yang Fan
Bai HaiFeng
Wu ChunYing
Wang QianPing
TI Sedimentology study on sub-member lithofacies paleogeography mapping and its petroleum exploration significance: Taking Ma5 member of Lower Ordovician Majiagou Formation in central-eastern Ordos Basin for example
SO ACTA PETROLOGICA SINICA
AB The central-eastern Ordos Basin develops evaporate and carbonate cyclic strata with a thickness of 500 similar to 900m. The study on lithology and sedimentary facies of the fifth member (Ma5) of Lower Ordovician Majiagou Formation, which has a thickness of 200 similar to 350m, shows that it has secondary depositional cycle. The discussion on sedimentology and lithofacies paleogeography of its subdivision intervals not only makes the understanding of the variation in lithologic facies and the sedimentary evolution much clear, but also plays an important role in the Ma5 gas exploration. The key results are got as follows; (1) the prediction for favorable sedimentary facies zone (especially of the sedimentary facies for gas reservoir) is much precise and the lithofacies paleogeography mapping for sub members of the main play is more purpose-direction; (2) the mechanism for dolomitization is further explored, and dolomitization in the short-period transgressive sequence is influenced by the inherited paleogeography pattern and sedimentary sequence evolution; (3) the establishment of a large-scale lithologic play model for the Ordovocian middle assemblage (consisting of the Ma5_5 to Ma5_10 sub-members) in the eastern slope of the central paleo-uplift and the discovery of the gas province with a reserve of trillions cubic meters; and (4) the proving of the lateral hydrocarbon charging model for Ordovician sub-salt reservoirs and its important breakthrough in the recently exploration. The lithofacies paleogeography mapping for sub-members thus holds an important advance in paleogeography and it plays an important role not only in the study on facies zone distribution, sequence evolution and its dolomitization, but also in the prediction of favorable reservoirs and understanding of trap and pool-formation.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1094
EP 1106
UT WOS:000402585200006
ER  

PT J
AU Guo, XS
Hu, DF
Huang, RC
Duan, JB
Ji, CH
AF Guo XuSheng
Hu DongFeng
Huang RenChun
Duan JinBao
Ji ChunHui
TI Developing mechanism for high quality reef reservoir (Changxing Formation) buried in ultra-depth in the big Yuanba Gas Field
SO ACTA PETROLOGICA SINICA
AB The formation and preservation mechanism of ultra-deep burial high quality hydrocarbon reef reservoirs in Changxing Formation of Yuanba Gas Field were revealed by the systematically analysis of reservoir petrology and geochemistry, combined with dynamic simulation of carbonate corrosion and reservoir historical pressure recovery. The results show that early surficial corrosion and shallow burial dolomitization are the basic diagenesis of matrix porosity development. The overpressure generation hydraulic fractures, which formed by the cracking of deep-buried oil in paleo-reservoirs, are the key of reservoir permeability development. Pore-fracture coupling controls the formation of ultra-deep burial high quality reservoir. Based on the results of this study, a heterogeneous "pore-fracture dualistic structure" model of reef reservoirs was constructed, which provided the theoretical foundation for reef reservoir prediction.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1107
EP 1114
UT WOS:000402585200007
ER  

PT J
AU Wen, HG
Zhou, G
Zheng, RC
Peng, C
Zhang, B
Xu, WL
Zhang, YL
Luo, LC
AF Wen HuaGuo
Zhou Gang
Zheng RongCai
Peng Cai
Zhang Bing
Xu WenLi
Zhang YuLu
Luo LianChao
TI The sedimentation-diagenesis-reservoir formation system of reef dolomites from Changxing Formation in the eastern of Kaijiang-Liangping platform-shelf, Sichuan Basin
SO ACTA PETROLOGICA SINICA
AB The reef dolomite of Upper Permain Changxing Formation is one of the most significant gas reservoir types in Northeast Sichuan Basin. This paper aims to make an analysis of reef dolomites petrofabrics, diagenetic evolutionary sequences, trace elements (Fe, Mn, Sr), stable isotopes (C, O, Sr), fluid inclusions, hydrocarbon properties and sources from the Permian Changxing Formation in the east of Kaijiang-Liangping platform-shelf. Palaeogromorphology controlled the distribution of different types of platform margin reefs, and palaeosealevel changes controlled the geometry and scale of reefs of Changxing Formation. Reef flat or reef cap microfacies of platform margin, combined with locally framework reef facies, controlled the development position and spatial distribution of favorable gas reservoirs. The Changxing Formation dolomites in the east of Kaijiang-Liangping platform-shelf are divided into two main genetic types: penecontemporaneous dolomite and burial dolomite. High quality dolomite reservoirs of reef flat facies are only related to multiple burial dolomitization. We speculate that the main source of diagenetic fluids is high salinity deep-burial circulated seawater with low Mn and Fe contents, high Sr content, high delta(13) C values and Sr-87/Sr-86 ratios from the dissolution of widely distributed Early-Middle Triassic evaporites during the burial diagenetic process. Changxing syngenetic brine and deep hydrothermal fluids with organic acid are the secondary components of the diagenetic fluids. The Changxing Formation dolomites are divided into four diagenetic systems based on the hydrographic regime which include marine derived-associated brine, sealed brine, mixed hot brine and mixed hydrothermal fluid of deep source. The key to improve the reservoir quality is burial dolomitization and dissolution, which are developed in the diagenetic system of mixed hot brine. This paper demonstrates the existence of diagenesis-reservoir formation system which is the unity of burial dolomitization and hydrocarbon charging-accumulation and both of them are controlled by the same fluid carrier system. It reveals the coupling relationship among sedimentation, diagenesis and reservoir formation of dolomites in Changxing Formation. Meanwhile, the present research provides direction and guidance for further exploration.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1115
EP 1134
UT WOS:000402585200008
ER  

PT J
AU Hu, DF
Li, YP
Duan, JB
Zhang, KM
Fan, ZW
AF Hu DongFeng
Li YuPing
Duan JinBao
Zhang KuangMing
Fan ZhiWei
TI Sedimentary features of carbonates and evolution of isolated platforms in Devonian in Guizhong area
SO ACTA PETROLOGICA SINICA
AB Guizhong depression, which is a large scale Late Paleozoic marine residual basin that formed basically in the stable craton of Late Paleozoic to Mesozoic, have excellent requirements of oil & gas accumulation and exploration potential. Although there is no significant breakthrough in hydrocarbon exploration at present time, it is one of the favorable areas for oil & gas exploration in South China marine deposits because of its steady later structures, dominant uplifting and subsiding movements, weak faulting and compressing deformation and excellent reservoir formation conditions. Based on previous studies, the sequence litho-paleogeographic and sedimentary evolution of the host area in Devonian were analyzed by means of field inspection, well logging, seismic facies analysis and microscope observation in this paper. In order to study the sedimentary features and evolution of isolated reef in Devonian in host area, the following aspects are described in this paper: (1) The general geological conditons of the host area. After the Caledonian movement, it began to be pulled apart in the Devonian and continued to develop in the whole of the Late Paleozoic. Controlled by the contemporaneous faults, isolated carbonate platforms of varying size developed in the deep-water basin. Thus a special paleogeographic framework of "platform-basin-hill-trough" formed in the host area. (2) The classification of the sequence stratigraphy in Devonian in host area. The Devonian in host area can be divided into 3 third-level sequence: SS1, SS2 and SS3. (3) The research on the litho-paleogeography in Devonian in host area. According to drawing method of sequence litho-paleogeography, taking the third-level sequence as combilation unit. Five litho-paleogeographic maps were drawn, which manifest sedimentary framework of different stage of Devonian in host area. (4) The characteristics and evolution of isolated reef in Devonian in host area. Devonian reef is developed in the host area, and drilling data of well DS1 & GZ1 support the opinion that high quality biolithite and dolomite reservoirs do exist in the host area. There are 3 types reservoirs of reef, which is identified the five stage in the growth of the isolated carbonate platform's reef in host area. Based on this study, it worked out that Guizhong depression turned into the sedimentary framework which was platforms and basins between them in the background of Early Hercynian extensional movement after Caledonian up warping. With the characteristics of three types and five stages reefs growing up in vertical direction, several isolated carbonate platform's reefs were Distributed in the host area, which generated from the early period to the late period of Middle Devonian.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1135
EP 1147
UT WOS:000402585200009
ER  

PT J
AU Yang, S
Chen, HD
Zhong, YJ
Zhu, XM
Chen, AQ
Wen, HG
Xu, SL
Wu, CS
AF Yang Shuai
Chen HongDe
Zhong YiJiang
Zhu XiaoMin
Chen AnQing
Wen HuaGuo
Xu ShengLin
Wu ChaoSheng
TI Microbolite of Late Sinian and its response for Tongwan Movement episode I in Southwest Sichuan, China
SO ACTA PETROLOGICA SINICA
AB The authors analyze the sedimentary environment of the second and third member of Dengying Formation and discuss start-stop time limit of Tongwan Movement episode I which has argued before by studying sedimentary features and geochemical features in Xianfeng profile. The deposition of Xianfeng profile, in Ebian area, Leshan, is continuous in Dengying period of Sinian. The depositional features of lower part in the second member of Dengying Formation is in rich microbolite while microbolite is poor in the upper part with decreasing bacteria according to the result of actual measurement of second and third member of Dengying Formation in Xianfeng profile. The sedimentary features in the third member of Dengying Formaiton are blue grey and dark grey mudstone and the contact relationship is obviously abrupt with the second member of Dengying Formation. Result of the geochemical analysis show sediment environment of original rock is seawater in this period. The rock type is dolomite with tidal flat facies, and can be divided into two major categories and eight small categories. delta(13) C appear obvious negative anomaly in second section of Dengying Formation, according to the relationship of delta(13) C with the sea level change and microbial, the authors think Tongwan Movement episode I should originate between rich algae layer and poor algal layer in second section of Dengying Formation. The tectonic uplift event is major factor, which caused decrease of sea level, decrease of paleoseawater temperature, decrease of paleo-salinity,, change of sedimentary environment, decrease of microbial population, transformation of rich algae to poor algal in the second member of Dengying Formaiton, and negative anomaly of delta(13) C.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1148
EP 1158
UT WOS:000402585200010
ER  

PT J
AU Song, Y
Zhou, L
Guo, XG
Chang, QS
Wang, XT
AF Song Yong
Zhou Lu
Guo XuGuang
Chang QiuSheng
Wang XiaTian
TI Characteristics and occurrence of lacustrine dolomitic tight-oil reservoir in the Middle Permian Lucaogou Formation, Jimusaer sag, southeastern Junggar Basin
SO ACTA PETROLOGICA SINICA
AB The Middle Permian Lucaogou Formation in the Jimusaer sag of the southeastern Junggar Basin is peculiar at developing lacustrine dolomitic and mixed reservoirs, differing from the conventional marine/lacustrine siliclastic/calcium reservoirs. Thus, the study of the Lucaogou reservoir is of scientific significance. Here we conduct a comprehensive study of the reservoir basic characteristics and occurrence regularities. Results show that the reservoir is composed mainly of dolarenite, sandy dolomite/dolomitic siltstone, and micritic dolomite in terms of lithology. A few siltstone and tufa were also observed. The reservoir space is mainly composed of secondary intergranular dissolution pores and some residual intergranular pores. Micro-cracks were developed only in some samples. The oilness of sample has a good correlation with physical property. Based on this correlation, the reservoir can be divided into three ranks. The first rank has porosity and permeability of > 12% and > 0. 1mD, respectively. The second rank is 7% similar to 12% and > 0. 01mD, respectively. The third rank is 4% similar to 7% and > 0. 001mD, respectively. Of these three ranks of reservoir, the first two are of relatively good quality. Their occurrence is characterized by thick in the south and thin in the north. The physical property is also better in the south compared with in the north. This is facies controlled and the sedimentary provenance is located in the south. This implies the favorable target areas for exploration. It is in the area along wells J32, J171, and J31 for the upper sweet point. It is in the area along wells J174, J251, and J36 for the lower sweet point. These results can be applied in the practical exploration.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1159
EP 1170
UT WOS:000402585200011
ER  

PT J
AU Sun, W
Liu, SG
Cao, JX
Deng, B
Song, JM
Wang, GZ
Yuan, Y
Wang, H
AF Sun Wei
Liu ShuGen
Cao JunXing
Deng Bin
Song JinMin
Wang GuoZhi
Yuan Yue
Wang Hao
TI Analysis on the formation conditions of large-scale marine deep and super-deep strata gas fields in the middle-northern segments of western Sichuan Superimposed Basin, China
SO ACTA PETROLOGICA SINICA
AB The discovery of the Lower Cambrian Mianyang-Changning intracratonic sag heavily enhanced the petroleum exploration prospects of the deep to super-deep strata ( marine carbonates ) in western Sichuan Superimposed Basin ( SSB ). In this paper, we have used drilling, seismic and outcrop data and combined the results of the previous studies to analyze the petroleum geological conditions of the marine deep to super-deep strata and the petroleum accumulation process of the Middle Triassic Leikoupo Fm. in western SSB. It shows that the petroleum geological conditions are very good in the marine deep to super-deep strata in western SSB. There is a multi source hydrocarbon-supply system in western SSB, which the Lower Cambrian huge mudstone is the main source rock. The superimposed marine reservoir rocks have developed in western SSB, including the Upper Sinian Dengying Fm. dolomite, Permian reef dolomite, and Middle Triassic Leikoupo Fm. dolomite and microbial rocks, and so on. There is a multi-sealing system of the petroleum accumulations in western SSB, which consisted of tight carbonate rocks, mudstone and gypsum strata. However, the three-dimensional conduit networks were developed, which consisted of faults, fractures, unconformities and high quality reservoir layers. These petroleum geological conditions mentioned above make the marine deep to super-deep strata probably form large-scale petroleum accumulations, and the western SSB is a gas-rich region of both primary gas pools and secondary gas pools because the deep burial made oil be cracked to gas. The formation process of the gas pools discovered in the fourth member of the Middle Triassic Leikoupo Fm. in western SSB probably includes four stages, which are hydrocarbon generating center ( Lower Cambrian source rocks, etc. ), gas generating center ( paleo-oil pools in the Upper Sinian and Permian carbonates, etc. ), gas accumulating center ( paleo-gas pools in the Upper Sinian and Permian carbonates, etc. ) and gas preserving center ( the secondary gas pools in the Middle Triassic Leikoupo Fm. Carbonates ).
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1171
EP 1188
UT WOS:000402585200012
ER  

PT J
AU Zhou, L
Li, D
Wu, Y
Zhong, FY
Ren, BB
Li, F
Zhang, XJ
AF Zhou Lu
Li Dong
Wu Yong
Zhong FeiYan
Ren BenBing
Li Fei
Zhang XinJi
TI The seismic response characteristics and distribution of the reefs in the Changxing Formation, northern Sichuan Basin
SO ACTA PETROLOGICA SINICA
AB The reefs that developed well on Upper Permian Changxing Formation in the northern Sichuan Basin were confirmed by the seismic and down hole drilling data. The development features of lithology and reservoir about reef are confirmed by way of analysis between the lithologic and electric information with typical well. The seismic forward digital modeling of platform margin reef can be built and analyzed on the basis of the lithologic and electric information combined with reflected event geometric features that between the reef and adjoining rock. The seismic response feature of organic reef can be confirmed via the method of comparing the sections between the seismic forward modeling and real seismic datum. The Seismic facies analysis can be got according with the seismic response feature of reef in the two-dimension seismic line system. The reef distribution in this region is analyzed by means of corresponding relationship of seismic facies and sedimentary facies. The depositional system named platform edge slope facies-platform edge reef facies-open platform facies which distribute around the platform-shelf and marine basin has a good correspondence with Northern Sichuan basin. The reef shows a hummocky facies or lens facies external and a disorder seismic reflection inside on the seismic section. A bright reflection can be found in the reef crest dolomite. There are humped and undercut reflection events on the bottom of reef interface. Also a draping structure can be traced on the upside of reef. The platform edge reef existed in the east and west of platform-continental shelf-sea basin on both sides that located on the northern Sichuan Basin which formed as a banding. The potential area of this reef comes to more than 2000km(2) which has a excellent potential exploration.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1189
EP 1203
UT WOS:000402585200013
ER  

PT J
AU Shi, KB
Jiang, QC
Liu, B
Pan, WQ
Tian, JC
AF Shi KaiBo
Jiang QiCai
Liu Bo
Pan WenQing
Tian JingChun
TI Sedimentary characteristics and evolution of Cambrian-Ordovician in Quruqtagh area, NE Tarim Basin, Xinjiang
SO ACTA PETROLOGICA SINICA
AB The Cambrian-Ordovician strata are preserved relatively intact in Quruqtagh of the Tarim Basin. It is significance to Cambrian-Ordovician hydrocarbon exploration in eastern Tarim Basin that a systematic study on the sedimentary characteristics and evolution of Cambrian-Ordovician in Quruqtagh area is carried out. In this paper, based on filed geological surveying and combined with published research achievements, we have discussed sedimentary characteristics, depositional model and evolution of Cambrian-Ordovician in Quruqtagh area. Study shows that Quruqtagh area experienced a second order transgression-regression cycle during Cambrian and there is a similar sedimentary characteristics in north and south region. In the early Cambrian, a rapid transgression result in deep-water shelf and basin depositional environment both north and south region; in the Late Cambrian, under the background of gradual regression, depositional environment began to appear a differentiation between north and south region. In Ordovician, Quruqtagh area experienced a new second order transgression-regression cycle and there is a significant sedimentary difference between north and south region. In north Quruqtagh, carbonate rock is dominant and development of the upward shallowing depositional facies sequence which consists of platform-marginal slope facies, open shelf facies, platform-marginal reef and shoal facies, open platform facies. In south Quruqtagh, clastic rock is dominant and development of the great thick deep-water flysch formation which consists of deep-water basin facies, shelf slope facies, turbidite deposit basin facies, clastic shelf facies. Carbonate ramp develop in Cambrian and margin steepen in the Early Ordovician due to platform building to the south and fault activity result in gravity flow deposit. On the basis of filling and leveling up, carbonate ramp develop again in the Middle Ordovician. In the Late Ordovician, suffering from periphery tectonic activity, Queerquek Mountain to Yaerdang Mountain area subside and development of distally steeped ramp.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1204
EP 1220
UT WOS:000402585200014
ER  

PT J
AU He, ZL
Li, SJ
Wo, YJ
Zhang, DW
Gu, Y
Zhou, Y
AF He ZhiLiang
Li ShuangJian
Wo YuJin
Zhang DianWei
Gu Yi
Zhou Yan
TI Major factors controlling hydrocarbon preservation condition in the marine basins of China and its evaluation ideas
SO ACTA PETROLOGICA SINICA
AB The marine basins of China are characterized with multi-cycle evolution, complex structure of basin-mountains and poor stability. Hydrocarbon preservation condition is the key factor controlling hydrocarbon exploration. Based on the analyses of characteristics of tectonic reconstruction and destruction styles of hydrocarbon reservoirs in the Chinese marine basins, this paper concluded the major factors controlling hydrocarbon preservation condition, and proposed the evaluation ideas of hydrocarbon preservation condition for the multi-cyclical strongly-reconstructed marine basins. Tectonic evolution of marine basins of China has characteristics with "five stages of tectonic movement superimposed on the same basin, and same sequence of tectonic evolution with different critical timing points for each stage of tectonic movement". The Mid-Late Yanshanian and Himalayan are the critical periods of tectonic changes for influencing hydrocarbon preservation. Destruction styles of marine hydrocarbon reservoirs mainly include the cutting of faults, uplifting and erosion, fold alteration, deep-burial cracking, baking of magma, fluid washing, biodegradation, long-term diffusion and etc. The major factors controlling preservation condition and its dynamic evolution include tectonic activity, seal rock, thermal regime, fluid activity and time. The evaluation ideas of hydrocarbon preservation conditions in Chinese marine basins are that the classification of evaluation units is made based on the dynamic analysis and evaluation of above-mentioned five major factors, as well as geological structures and source-seal assemblages. Based on the study of dynamic evolution of source-seal layers, systematic evolution of present- and paleo-fluids, dynamic processes of hydrocarbon accumulation, hydrocarbon preservation systems are dynamically evaluated, and then, favorable persevered units are selected.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1221
EP 1232
UT WOS:000402585200015
ER  

PT J
AU Liu, HG
Liu, B
Wu, SL
Zhang, XF
Tian, ZP
Shi, KB
Liu, JQ
AF Liu HongGuang
Liu Bo
Wu ShuangLin
Zhang XueFeng
Tian ZePu
Shi KaiBo
Liu JianQiang
TI The types and origin of the Penglaiba Formation dolomite in the Yubei area, Tarim Basin
SO ACTA PETROLOGICA SINICA
AB The Penglaiba Formation dolomites in the Yubei area can be divided into three types, which are laminated micritic-fine euhedral dolomite, medium euhedral-subhedral dolomite, coarse euhedral-anhedral dolomite respectively. The lamina of penecontemporaneous micritic-fine dolomite can be observed from both the core and the thin section. The REE normalized pattern and Sigma REE of micritic-fine dolomite resemble the characters of contemporaneous limestone. The delta O-18 shows similarity with the dolomite precipitated from the contemporaneous seawater. Those characters indicate that the dolomitization fluid of micritic-fine dolomite is contemporaneous seawater. The high salinity index shows a concentrated fluid character and in such an environment the rapid crystallization process results in less ordered dolomite. The high contents of Fe, Si and high Sr-87/Sr-86 in the intercrystal pores of dolostone demonstrate a relative low sea level and the mix of terrigenous material. The seepage reflux originated medium dolomite and coarse dolomite also have similar REE normalized pattern, Sigma REE and Sr-87/Sr-86 with the contemporaneous seawater, which show the seawater is still responsible for the dolomitization. The residual particles structure and the low diagenesis temperature calculated from the delta O-18 show that the reflux of seawater along the intergranular pores and fractures results in the dolomitization. The coarse dolomite experiences stronger recrystallization process than the medium dolomite during which the residual particles are destroyed and the value of Fe, Mn, delta O-18 are higher while Sr are expelled. The secondary outgrowth can also be recognized from the cathode-luminescence image from which we can figure out an obvious brighter margin in some dolostones.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1233
EP 1242
UT WOS:000402585200016
ER  

PT J
AU Chen, AQ
Yang, S
Chen, HD
Zhong, YJ
Xu, GM
Song, XB
Fu, SY
AF Chen AnQing
Yang Shuai
Chen HongDe
Zhong YiJiang
Xu GuoMing
Song XiaoBo
Fu SiYi
TI The sedimentary filling model of epeiric platform and new inspiration of innercratonic carbonate for oil & gas exploration
SO ACTA PETROLOGICA SINICA
AB The epeiric sea of intracraton is an important basin for the formation of the carbonate rocks. In addition to the karst reservoir occurred in the weathering crust, the non-karst dolomite reservoir which distributed widely hasn' t got enough attention for a long time. In recent years, with the progress of the deep and ultra deep exploration technology, the non-karst dolomite has been successively awarded hydrocarbon discoveries, but its prediction difficulty is far more than the "moving target" of rimmed platform reefs. In order to reveal the macro-development distribution of the non-karst dolomite reservoir fatherly, this paper focus on the study of high-precision lithofacies paleogeography and depositional filling model of Majiagou Formation of Ordovician, Ordos Basin, and Leikoupo Formation of Triassic, Sichuan Basin. The results showed that: the epicontinental platform located in stable intrarcraton basin and generally formed in the low latitude dry climate during the geological greenhouse period. The tidal platform distributed widely associated with salt lake is the hallmark characteristics of the epeiric sea. Its micro environment can be further divided into the mud rich dolomite supratidal flat, dolomite upper intertidal flat, upper intertidal microbial mats, lower intertidal sheet tidal-front beach, upper subtidal calcitedolomite lagoon, lower subtidal gypseous dolomite lagoon. Although intracraton epeiric platform is a relatively static environment, the sedimentary formation is not a homogeneous geologic material. Because the sea-level changes lead to sedimentary facies belt migrate frequently in such a flat intracraton geomorphology, the supratidal facies, intertidal facies and subtidal facies interact and stack frequently. This reciprocating migration process, the flat shaped of grain/particle/microbial dolomite developed broadly, which restricted by lagoon, paleo-uplift or tidal flat island. The sequence of epeiric facies is a typical upward shallowing structure, including two main depositional filling patterns, such as the tidal flat progradation wedge and mosaic of tidal flat islands. The sheet dolomite lens body formed by these two kinds of patterns, usually extending more than 100km, even across the whole epeiric platform, can be contrast in the sequence structure and the thickness, and is a favorable exploration target that can be comparable to the reef-bank complexes of the platform margin.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1243
EP 1256
UT WOS:000402585200017
ER  

PT J
AU Hou, MC
Deng, M
Shi, HS
Liu, J
Wang, RL
Zeng, Y
Zhou, XK
Wu, XC
AF Hou MingCai
Deng Min
Shi HeSheng
Liu Jun
Wang RuiLiang
Zeng Yi
Zhou XiaoKang
Wu XiChun
TI The process of growth, development and extinction of the Early Miocene carbonate rocks and controlling factors in the Pearl River Mouth Basin
SO ACTA PETROLOGICA SINICA
AB The disappearance of the carbonate platform is the frontier and hot field of sedimentary research. The Lower Miocene Zhujiang Formation carbonate deposited in the Dongsha uplift of Pearl River Mouth Basin is the latest marine carbonate in China. The process of origin, development and perished of the Zhujiang Formation carbonate is controlled by the tectonic movement, sea-level change and provenance, the research of this pattern can be served as a classical case study in the South China Sea and even in the world. According to the calcareous nannofossils and planktonic foraminifer zones collected from the drilling core, the upper bond of the Zhujiang Formation and the Middle-Lower Miocene boundary are classified in the boundary between calcareous nannofossil NN4 zone and NN5 zone, the lower bond of the Zhujiang Formation and the Miocene-Neocene boundary are divided in the bottom of foraminifer N4 zone. The ages of the foraminiferal N4-N8 zones and the calcareous nannofossils NN2-NN4 zones are determined, the lowest and the topmost boundary are 23. 03Ma and 15. 97Ma respectively, and the seismic reflection is located between T40 and T60. The carbonate platform firstly formed in 21Ma, and then was submerged by mudstone in 16. 5Ma. Earlier Dongsha uplift was higher in the south and lower in the north. After 21Ma, because of subsidence of the Dongsha uplift, the function of the provenance to Zhu 1 depression was lost. Carbonate platform was developed in the north of Dongsha uplift which subsided quickly. At the early stage, there was a carbonate ramp. After 20Ma, the whole Dongsha uplift was submerged, and then extensive development of carbonate formations was start, including the transition from carbonate ramp to platform. As the settle expanded to the southern, the Dongsha uplift gradually changed to higher in the north, the whole platform expanded continuously to the southeast, the platform sedimentary is gradually shrinking to local reel flat complexes, the top of northern paleogeomorphic remanet fragmentary patch reefs. After 16. 5Ma, the center of subsidence had been migrated to Zhu 2 sag, then the fragments from northern and northwest prograde continuously to Dongsha uplift, ultimately led to the termination of the platform. Combined with the analysis of geological events in the Zhujiang Formation period, this paper argues that the demise of early carbonate rocks is due to the global sea level down to the lowest at this time, which accelerate the supply of sediment in the region. The limestone is directly submerged by the sediment from the north. The disappearance time of carbonate rocks (formed from 20 +/- 0. 5Ma to 18. 3 +/- 0. 5Ma) is controlled by the change of relative sea level, volcanic action of basement and the migration of subsidence center. The dead time of the late phase carbonate may be after the tectonic inversion and the growth environment of carbonate rocks has changed which are caused by clastic sediment from the north. Therefore, the terrigenous clastic injection, subsidence center migration, relative sea level changes and ancient landform control the growth and death of carbonate rocks.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1257
EP 1271
UT WOS:000402585200018
ER  

PT J
AU Lin, LB
Yu, Y
Huang, QC
Shi, H
AF Lin LiangBiao
Yu Yu
Huang QiChen
Shi He
TI The geochemical characteristics and sedimentary environment analysis of Ordovician in Wangcang region, northern Sichuan Basin
SO ACTA PETROLOGICA SINICA
AB The Ordovician is well exposed with complete stratigraphy in northern Sichuan Basin. Two sections in Wangcang region were selected and twelve samples were collected, which were tested with major, trace and rare earth elements. Combined with field outcrop observation, the Ordovician were divided into five types sedimentary facies: shore, shelf, restricted platform, platform margin shoals and platform margin slope. Based on the geochemical characteristics of elements, the enrichment regularity and environmental analysis, the amount of Sr, Sr/Ca, Ni and Mn in the Ordovician carbonate rock were on the rise and Sigma REE also had an upward trend with the increase of water depth and the distance from land. These data indicate that the Ordovician sea level were overall deepens. The highest sea level appeared in the Xiliangsi Formation sedimentary period, and then changed the trend to shallow. Na/Ca ratio suggested that the salinity was reduced from restricted platform to platform margin slope. Fe2+/Fe3+ and V/(V + Ni) both indicated that the Zhaojiaba Formation and the Guniutan Formation sedimentary period were anoxic and reducing environment. But the Pagoda Formation sedimentary period were relative oxygen enriched environment, which suggested that the sea level may have a relative decline in this process, or may be associated with oxygen-rich sea water at this period.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1272
EP 1284
UT WOS:000402585200019
ER  

PT J
AU Wen, L
Wang, WZ
Zhang, J
Luo, B
AF Wen Long
Wang WenZhi
Zhang Jian
Luo Bing
TI Classification of Sinian Dengying Formation and sedimentary evolution mechanism of Gaoshiti-Moxi area in central Sichuan Basin
SO ACTA PETROLOGICA SINICA
AB The reserves of the Sinian Dengying gas reservoirs in central Sichuan Basin are large and the reservoirs are widely distributed. On the basis of Folk (1959) carbonate classification scheme and Zhang et al. (1996) rock classification scheme, combined with Dengying Formation of Sinian in Sichuan Basin, and the carbonate rocks of the Dengying Formation can be divided into 3 sub-classes, 10 kinds of micro-classes. The classification scheme is difference in that thrombolite belongs to grain rock, and microbial carbonate rocks are divided into three sub-classes according to their form. In addition, the development and distribution of sedimentary rocks are controlled by sedimentary sequences. The main sedimentary rock is orthochemical rock in the TST stage, such as micritic dolomite, microbolite and so on. The main sedimentary rock is allochemical rock, such as thrombolite, dolarenite and so on. In the vertical direction, the evolutionary characteristics of lithology is deep color micrite dolomite -> microbial carbonate -> grain dolomite -> light color micrite dolomite, and which is lagoon subfacies -> algal mound subfacies -> grain beach subfacies -> table subfacies. The thirdly, grain rock is the main reservoir rocks, such as thrombolite and dolarenite. The last, the development and distribution of different rocks in Dengying Formation carbonate rocks play a controlling role in reservoir development. In addition to the study of karstification, it is necessary to pay attention to the analysis of the characteristics of sedimentary palaeogeomorphology and lithofacies distribution, which can help to effectively predict the "reservoir dessert zone" of Dengying Formation.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1285
EP 1294
UT WOS:000402585200020
ER  

PT J
AU Zhang, SM
Liu, B
Qin, S
Tian, YJ
Zhang, XF
Guo, RT
AF Zhang ShanMing
Liu Bo
Qin Shan
Tian YongJing
Zhang XueFeng
Guo RongTao
TI Deeply buried diagenetic process and its significance for the carbonate of Changxing Formation in the northeastern Sichuan Basin
SO ACTA PETROLOGICA SINICA
AB The Upper Permian Changxing Formation, one of the main reservoirs in the northeastern Sichuan Basin is made up of crystalline dolomite, residual bioclastic/sand-clastic dolomite, biohermal dolomite and sparry bioclastic limestone. Observations on the thin sections display that the reservoir space is mainly made up of intercrystalline pore and intercrystalline solution pore, followed by biological cavity pore and residual intergranular pore, with a few caves and fractures. The high quality reservoir of Changxing Formation mainly develops in the platform margin reef facies and shoal facies which prefer to develop abundant primary pores and suffer meteoric dissolution first. The primary pores provide space for the interaction between the dolomitization fluid and carbonate during diagenetic process. The eogenetic pores transform into intercrystalline pores. Dolomite is more likely to preserve high porosity for its high anti compaction feature. Fast deeply buried in the Early Triassic makes Changxing Formation reach the middle-deep burial stage quickly. During the deep burial stage, fractures are less developed in the study area, which has a minor effect on Changxing Formation. Hydrocarbon emplacement in the Late Triassic isolates the contact between the carbonate and the pore fluid, which restrains the dissolution and cementation of the dolomite within the pores. The pre-existed pores are well preserved. Early fast deeply buried makes the early pores get into the closed system in a short time. The carbonate-fluid reaction reaches an equilibrium state in a nearly closed system in the deep burial stage, resulting in limited dissolution and cementation. Deep burial environment is the setting for porosity modification and preservation. It is just a redistribution of the pore space.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1295
EP 1304
UT WOS:000402585200021
ER  

PT J
AU Xing, FC
Lu, YC
Guo, TL
Li, ST
Hou, MC
Hu, HR
Wu, SY
AF Xing FengCun
Lu YongChao
Guo TongLou
Li SiTian
Hou MingCai
Hu HuaRui
Wu SiYue
TI Sedimentary texture diversity of different carbonate platform margins and it its significance for petroleum exploration: A case study of carbonate platform margins in Feixianguan period of the Early Triassic, NE Sichuan basin, China
SO ACTA PETROLOGICA SINICA
AB As research continues, the diversity of sedimentary textures and evolution about carbonate platform margin belts (abbreviated as platform margin belt) have been gradually realized, which not only records the palaeogeographic characters and its evolution process, but also significantly influenced on its carbonate oil and gas reservoir. Three parallel distributed Early Triassic Feixianguan period carbonate pateform marginal belts, which located in NE Sichuan basin, were studied to reveal the distribution of carbonate platform margin belts. Through the comprehensive analysis of well drilling, outcrops and seisimic data, the study verified that the distribution of the platform marginal reef shoal zones in the Late Permian Changxing period was obviously inherited by the platform marginal oolitic shoals in the Early Triassic Feixianguan period, and the distribution of oolitic shoals migrated toward east during the Early Triassic Feixianguan period. Results showed that there are obvious differences of texture between these three platform margin belts. Migration and aggradation, the two kinds of platform margin texture, can be identified obviously in different platform margins. Migration platform margin belts include Yuanba-Longgang-Liangping platform margin belt (abbreviated as No. 1 platform margin belt) and Jianchi-Jiwangdong-Shatuo platform margin belt (abbreviated as No. 3 platform margin belt), with typical characteristic of gentle platform -margin slope and obvious migration, resulting in wide and thin oolitic shoal developing, and mutual dolomitization along the carbonate platform margin. Aggradation platform margin belt distributs in Tiechanghe-Puguang-Luojiazhai platform margin belt (referred to No. 2 platform margin belt), which is characterized by aggradational sedimentary texture, and eastward migration at the later period. Aggradation platform margin belt general is always narrow with front slump, the oolitic shoal in aggradation platform margin belt is concentrated distribution with a great thickness and complete dolomitization. The distribution of sedimentation and reservoir is difference from each other in different platform margin oolitic shoals. The gradient of the No. 1 platform margin is alternation between gentle and steep, and the characteristics of oolitic shoals in gentle platform margin area are thin cumulative thickness, weak dolomitizaiton or non-dolomitizaiton, and obvious migration. However, oolitic shoals in steep platform margin area has the features of short distance migration, massive cumulative thickness and dolomitizaiton gradually enhancing upward. As facing relative open sea, influenced by storm obviously, the No. 3 platform margin is characterized by lateral dolomitization among layers and vertical dolomization enhancements. Due to the absence of supporting data, geomorphy features of the No. 3 platform margin belt need further researched. The thickness of oolite shoals in the No. 2 platform margin belt changes in transverse direction, but its aggradation texture and overall dolomitization is relatively stable. The diversity sedimentary texture in different platform margin belts at study area are influenced obviously by comprehensive factors, which includes palaeogeomorphology of Late Changing period, sea-level change, palaeowind direction and synsedimentary differential sagging during Feixianguan period. In this paper, sedimentary and dolomite distribution model of platform margin belts during the period of Lower Triassic Feixianguan Formation has been reconstructed.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1305
EP 1316
UT WOS:000402585200022
ER  

PT J
AU Huang, HY
He, DF
Li, YQ
Wang, B
AF Huang HanYu
He DengFa
Li YingQiang
Wang Bei
TI The prototype and its evolution of the Sichuan sedimentary basin and adjacent areas during Liangshan and Qixia stages in Permian
SO ACTA PETROLOGICA SINICA
AB The upper Yangtze region began to experience in large-scale transgression and forming a relatively stable carbonate platform in Permian. Understanding the sedimentary-filling pattern and the tectonic characteristic of the prototype basin is the key to reveal the formation mechanism of the Sichuan Basin, and may also help to better understand evolution process of the typical Sichuan multicycle and superimposed basin. On the basis of predecessors' research results, we reconstruct the tectonic and palaeogeographic framework of the prototype basin and analyze the tectonic-sedimentary evolution process during Liangshan and Qixia deposition stages by comprehensively making use of borehole and outcrop data. Mainly controlled by the ancient land form of high in the central and low in the east and west from Late Carboniferous and the large scale transgression, the Liangshan stage was characterized by the tidal flat and shore face sedimentary system; and subsequently transitioned to an relatively stable carbonate platform sedimentary environmental during the early stage of Qixia deposition, influenced by extending action, the sea level rises relatively and characterized by open platform sedimentary environmental; and during the later stage of Qixia deposition, the sea level falls relatively and characterized by restricted platform, platform-margin beach sedimentary environmental. Thus, it reveals that the Sichuan basin and its adjacent areas mainly influenced by extending action and could be recognized as a typical intracratonic depression with edge rift basin. The cyclical change of the sea level and differential settlement of the basin play an important role in the evolution of the sedimentary-filling pattern and palaeogeographic framework.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1317
EP 1337
UT WOS:000402585200023
ER  

PT J
AU He, DF
Cui, YQ
Zhang, YY
Shan, SQ
Xiao, Y
Zhang, CB
Zhou, CA
Gao, Y
AF He DengFa
Cui YongQian
Zhang YuYing
Shan ShuaiQiang
Xiao Yang
Zhang ChuanBao
Zhou CongAn
Gao Yuan
TI Structural genetic types of paleoburied hill in Jizhong depression, Bohai Bay Basin
SO ACTA PETROLOGICA SINICA
AB Buried-hill is an important exploration target in Jizhong depression. Analyzing its geologic structure and disclosing its formation mechanism is key to deepen the understanding of its tectonic evolution and the oil and gas exploration fairways. Based on the high-resolution 2-D and 3-D seismic data, and hundreds of deep exploratory wells across the depression, the paper used the structural analysis method to explore the buried-hill stratigraphic strata, fault system, and tectonic evolution as a whole, and put forward a new scheme for buried-hill genetic classification. It is shown that the buried-hill in Jizhong depression underwent a series of processes such as the sedimentary rock formation before Mesozoic, the compression in Late Jurassic, the multi-phase extension during Cretaceous to Paleogene, and the thermal subsiding and burying during Neogene to Quaternary. According to the tectonic location, the structural deformation feature, and the strength of extension, the buried-hill can be divided into 14 kinds of basic genetic mechanism. Due to the long period of tectonic evolution and the combined influences of the inner- and exo-genetic geological processes, the buried-hill has largely of a composite genetics. In map-view, the different genetic buried-hill zones exhibit regularly. It gives 7 kinds of structural association, such as, the tilted block and high bulge, antithetic fault step, synthetic fault step and high bulge, transverse anticline or relay high and inverted slope, high bulge and extension allochthon block and inverted slope, high high-bi-direction rotation-high bulge; tilted block and metamorphic core complex, etc. Among these, such types of buried-hills as the antithetic tilted block, the high bulge, the fault step, the inverted slope, and the allochthon block have favorable petroliferous potential owing to the matching of the source rocks and the reservoir rocks, the timing for trapping and accumulating. The oil and gas resource is much rich in Jizhong depression. The above genetic classification of buried-hill is helpful for addressing the oil and gas accumulation and distribution.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1338
EP 1356
UT WOS:000402585200024
ER  

PT J
AU Xu, SL
Yuan, WJ
Hou, MC
Lin, LB
Ji, GJ
AF Xu ShengLin
Yuan WenJun
Hou MingCai
Lin LiangBiao
Ji GuangJian
TI Petrological characteristics and sedimentary environment of carbonate during Aeronlian stage of Early Silurian in the southern margin of Yangtze Craton
SO ACTA PETROLOGICA SINICA
AB The carbonate rocks which developed in the southern margin of upper Yangtze Craton during Aeronlian stage of Early Silurian had a huge potential of oil and gas exploration, but its rock components, petrological types and sedimentary environment are not clear. Combined with the profile measurements in the field and thin section identification in the indoor, this paper conducts rock components, petrological types and sedimentary environment analysis of carbonate rocks in the southern margin of Upper Yangtze Craton during Aeronlian stage of Early Silurian. The study shows that rock components of carbonate rocks are mainly bioclastic, intraclasts and ooide less. According to Mr. Zeng Yunfu' s classification scheme carbonate about rock structural genesis, carbonate rocks in this area are mainly seven types, includes sparry oolitic limestone, sparite bioclast limestone, coral reef limestone, sparry intraclastic calcarenite, intra-biomicrite, microcrystalline calcarenite, micrite. According to the analysis of the characteristics of petrology and outcrops, during the early stage of Aeronlian, Shiniulan Formation in the southern margin of Upper Yangtze Craton mainly consisted of carbonate ramp, further divided into the sedimentary facies zones includes inner ramp and outer ramp; during the later stage of Aeronlian, Shiniulan Formation in the southern margin of Upper Yangtze Craton mainly consisted of carbonate platform, which developed open platform, platform margin beach, platform margin reef, platform foreslope and so on. Based on the three order sequence, the regional distribution characteristics of the high energy reef flat facies are revealed, and the reef beach bodies are mainly developed in the SQ2 sequence, which is characterized by the zonal distribution.
SN 1000-0569
EI 2095-8927
PD APR
PY 2017
VL 33
IS 4
BP 1357
EP 1368
UT WOS:000402585200025
ER  

EF  

黔ICP备07002071号-2
主办单位:中国矿物岩石地球化学学会
印刷版(Print): ISSN 1000-0569 网络版(Online): ISSN 2095-8927
单位地址:北京9825信箱/北京朝阳区北土城西路19号
本系统由北京勤云科技发展有限公司设计

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