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Sedimentary architecture and distribution of intra-platform shoal in sequence framework of Permian Changxing Formation in central Sichuan Basin,SW China

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Petroleum Exploration and Development 2023年第2期50卷 388-403页

作者： WANG Dong LIU Hong TANG Song BAI Jinhao ZHOU Gang LI Zhengyong LIANG Feng TAN Xiucheng GENG Chao YANG Ying State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Southwest Petroleum UniversityChengdu 610500China Sichuan Natural Gas Geology Key Laboratory Southwest Petroleum UniversityChengdu 610500China Southwest Petroleum University Division of Key Laboratory of Carbonate ReservoirsCNPCChengdu 610500China Central Sichuan Oil and Gas District PetroChina Southwest Oilfield CompanySuining 629000 Research Institute of Petroleum Exploration and Development PetroChina Southwest Oilfield CompanyChengdu 610041China Gas Production Administrative Department of Northern Central Sichuan Gas District PetroChina Southwest Oilfield CompanySuining 629000China Southern Sichuan Gas District PetroChina Southwest Oilfield CompanyLuzhou 646000China

Based on the comprehensive analysis of core, thin section, logging and seismic data, this study carried out the identification and comparison of Permian Changxing Formation sequences, clarified the typical sedimentary architectures of intra-platform shoal, investigated the vertical and horizontal development and distribution of intra-platform shoal in each sequence, and thus established the sedimentary evolution model of shoal body. The study results are reflected in four aspects.First, there are two complete third-order sequences(SQ1 and SQ2) in Changxing Formation in central Sichuan Basin. SQ1 is generally thick in the north and thin in the south, and SQ2 shows a thickness differentiation trend of “two thicknesses and three thinnesses”. Second, the Changxing Formation in central Sichuan Basin mainly develops intra-platform shoal, inter-shoal sea and intra-platform depression subfacies. In the vertical direction, the intra-platform shoal mainly presents two typical sedimentary sequences: stable superposed and high-frequency interbedded. Third, the stable superimposed sedimentary sequence is developed in the shoal belt at the edge of intra-platform depression, which is composed of two shoal-forming periods and located in the highstand systems tracts(HSTs) of SQ1 and SQ2. The high-frequency interbedded sedimentary sequence is developed in the southern shoal belt of intra-platform depression, which is composed of four shoal-forming periods and mainly located in the HST of SQ2. Fourth, during the SQ1 deposition, the intra-platform shoal was mainly developed at the edge of the intra-platform depression on the north side of the study area, and the inter-shoal sea subfacies was mainly developed on the south side. During the SQ2 deposition, the intra-platform shoal was widely developed in the area, forming two nearly parallel intra-platform shoal belts. The study results provide direction and ideas for exploration of Changxing Formation intra-platform shoal reservoirs in central Sichuan Basin.

关键词： Sichuan Basin Permian Changxing Formation intra-platform shoal sequence stratigraphic framework typical sedimentary sequence sedimentary evolution model

Mesozoic “Red Beds” and its Evolution in the Hefei Basin

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Acta Geologica Sinica(English Edition) 2012年第5期86卷 1060-1076页

作者： ZHANG Jiaodong CHEN Xuanhua LI Qiuli LIU Chengzhai LI Bing LI Jie LIU Gang REN Fenglou Chinese Academy of Geological Sciences Beijing 100037China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Shengli Oil Company Dongying 257100China

The Hefei Basin is the largest basin in the North China landmass with complete and well-preserved Mesozoic and Cenozoic strata. In the basin there developed a suite of extremely thick ＂red beds＂ in the Mesozoic. Owing to complex evolution processes and a lack of paleontological traces, there have been controversies regarding the division and correlation of this suite of red beds. Based on results obtained in recent years in drilling, seismic and surface geological investigations and in consideration of relationships between seismic sequences and regional tectonic events, as well as evidence in paleontology, petrology and isotopic dating, this paper preliminarily puts forward the following ideas about the sequence stratigraphic framework of the continental ＂red beds＂ in the Hefei Basin. （1） The Zhougongshan Formation and the Yuantongshan Formation have similar lithologic, geophysical and paleontological characteristics, so we incorporate them into a single formation, called the Yuantongshan Formation, and the original Zhougongshan and Yuantongshan Formations are regarded as the upper and the lower parts of the newly defined Yuantongshan Formation. Its age is the Middle Jurassic; （2） the Zhuxiang Formation belongs to the Upper Jurassic Series and （3） the age of the Xiangdaopu Formation is the Lower Cretaceous. Furthermore, signatures of depositional evolution are analyzed in the paper based on features of seismic reflection, outcrops and drilling data. The Early and Middle Jurassic is characterized by a foreland basin, which is influenced mainly by uplift and longitudinal compression of the Dabieshan Mountains; the Lower Jurassic System has a relatively small depositional area; the Middle Jurassic strata are distributed extensively over the whole basin, marking the summit of basin development; a flexure basin is characteristic of the Late Jurassic, manifesting a joint effect of the Dabieshan and Zhangbaling Mountains with the former being more significant. In the Early Cretaceous, the Xiangdaopu Formation was distr

关键词： Mesozoic Erathem red beds sequence stratigraphic framework depositional evolution Hefei Basin

High-Resolution Transgressive-Regressive sequence Stratigraphy of Chang 8 Member of Yanchang Formation in Southwestern Ordos Basin,Northern China

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Journal of Earth Science 2010年第4期21卷 423-438页

作者：吕明胜陈开远薛良清衣丽萍朱红涛 Research Institute of Petroleum Exploration & Development PetroChina School of Energy Resources China University of Geosciences China National Oil and Gas Exploration and Development Corporation Faculty of Earth Resources China University of Geosciences

The reservoirs within the Chang 8 Member of Yanchang(延长) Formation in the southwestern Ordos basin are characterized by low permeability.It is significant to build a high-resolution sequence stratigraphic framework for the exploration and development of these reservoirs.Based on an integrated investigation of well logs,seismic data,cores and outcrops,the Chang 8 Member is interpreted as a 3rd-order transgressive-regressive(T-R) sequence,which consists of six 4th-order T-R sequences,namely,K1,K2,K3,K4,K5 and K6,respectively,from base to top.Each 4th-order sequence comprises a transgressive systems tract overlain by a regressive systems tract.From K1 to transgressive systems tract of K4,it is characterized by the landward shifts of facies and overall retrogradational sequence stacking pattern due to accommodation increase more than sediment supply during the 3rd-order base-level rise.The distributary channels are mainly deposited in the transgressive systems tracts,and the interdistributary bays,sheet sands,and small-scale mouth bars are primarily developed in the regressive systems tracts in response to the 4th-order base-level fluctuations.From the regressive systems tracts of K4 to K6,it is characterized by the basinward shifts of facies and overall progradational sequence stacking pattern because of accommodation increase less than sediment supply during a fall in 3rd-order base level.The distributary channels are mainly accumulated in the transgressive systems tracts,and distributary channels and mouth bars are deposited in the regressive systems tracts as a result of the 4th-order base-level changes.Detailed stratigraphic and sedimentological analyses indicate that sequences K1,K2,K5 and K6,as well as the basin edge of K3 and K4,remain potential for exploration and development due to their high reservoir quality in response to the low accommodation and more sediment supply.

关键词： transgressive-regressive sequence base level sediment supply sequence stratigraphic framework Ordos basin.

The Cenozoic sedimentary environment and sedimentary filling evolution of Wan'an Basin in the western South China Sea

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Petroleum Research 2019年第3期4卷 257-267页

作者： Yibo Wang Zhigang Zhao Xiaojun Xie Huaizhong Yang Shuang Song CNOOC Research Institute Company Limited Beijing100028China

As one of the basins with extremely abundant oil and gas resources in South China Sea,the Wan'an Basin has attracted great attention from domestic and international geologists and hydrocarbon explorers.Currently,the sequence stratigraphic framework,distribution of sedimentary systems and sedimentary filling evolution of the Wan'an Basin are still not clear,consequently,it bring some difficulties for hydrocarbon exploration.Based on the palaeobios,well drilling,well logging,and seismic and other data,the sequence stratigraphic framework of the Wan'an Basin is established,and the sequence interfaces of T100,T60,T50,T40 and T30 in this study are identified.On this basis,the sedimentary environment and sedimentary filling evolution of the Wan'an Basin are systematically analyzed.The results show that the basin had experienced three tectonic evolution periods since Cenozoic,i.e.,the OligoceneeEarly Miocene extensional fault-depression period,Middle Miocene strike-slip reformation period and Late Miocene eQuaternary regional depression period.Thereinto,the provenance in the extensional faultdepression period(OligoceneeEarly Miocene)was mainly from the western uplift of the basin,where the deltaeshore-shallow lacustrineebathylimnetic sedimentary system during Early Oligocene and delta elittoral-neritic sedimentary system during Late OligoceneeEarly Miocene were developed respectively.The provenance during the strike-slip reformation period(Middle Miocene)was still mainly from the western uplift of the basin,where the deltaelittoral-neriticecarbonate platform sedimentary system was developed,and the carbonate platform began to develop abundantly.The provenance during the regional depression period(Late MioceneeQuaternary)is mainly supplied by input of the western distal large rivers,the deltaelittoral-shallow seaecarbonate platformebathyal sea sedimentary system was developed in the Late Miocene,and the shelf-margin deltaecontinental slopeebathyal sea sedimentary system was developed during Pliocene-Quaternary.Therefore,

关键词： Wan'an Basin Cenozoic sequence stratigraphic framework Tectonic evolution Sedimentary system Sedimentary filling evolution

Simulation of the Subsidence and Deposition Processes of the Foreland Basin in the Southwestern Margin of Ordos

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Acta Geologica Sinica(English Edition) 1996年第3期70卷 233-245页

作者： Liu Shaofeng, Li Sitian, Zhuang Xinguo, Jiao Yangquan and Lu ZongshengChina University of Geosciences, Wuhan China University of Geosciences W uhan

Characteristics of deformation in the thrust belt and sequence stratigraphic framework in the foreland basin, structural features of the basin margin, and the episodic thrusting are studied in this paper by combining the eastern Qilian thrust belt and the Late Triassic foreland basin on the southwestern margin of Ordos. On this basis, a geological model and a mechanical model of coupling mechanism were established for the pair of thrust belt and foreland basin, and the subsidence and deposition process of the foreland basin were simulated on given parameters.

关键词： thrust belt foreland basin sequence stratigraphic framework episodic thrusting simulation

Depositional sequences of Yitong Graben (Eastern China) and Its Response to Transform-Extensional Processes

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Journal of Earth Science 1999年第2期18卷 80-87页

作者： Lu Yongchao Ren Jianye Li Sitian Chen Ping Ye Hongpo Faculty of Earth Resources, China University of Geosciences, Wuhan 430074 Cui Xuezhou Li Bencai Institute of Exploration and Development of Jilin Oil Field, Fuyu 131200

The Yitong graben is located in the northeastern segment of the Tertiary rift system in East China. The graben is bounded by a steep dipping transform fault on the northwestern side and subparallel normal faults on the southeastern side, with very thick marginal fan complexes indicating syntectonic sedimentation. The graben is infilled with Tertiary sediments up to 6 000 m thick, in which a series of different scaled hiatuses and tectonic inversion events have been discerned during hydrocarbon exploration. According to regional and local conformities, the basin infill may be divided into three tectonic sequences, among which the major sequence TS2 is further subdivided into three sequence sets and fourteen subsequences. Based on the sequence stratigraphic framework, depositional system tracts which are characterized by marginal fan complexes on both sides of basin and deep or shallow lacustrine deposits in the central part are reconstructed. The subsidence curves show that the graben had undergone several rapid subsidence episodes, which is interpreted to have been caused by multiple stretching of the lithosphere. Integrative analysis of the depositional structural features shows that the regional tectonic stress system experienced a transformation from dextral transformational shear through thermal subsidence to sinistral compressional shear with a general extensional setting. Extension and wrenching dominated the graben evolution and affected the depositional style in different evolutionary stages, the spatial configuration of depositional system and its relationship with unconformities. The conclusions have been applied with some successes to studying the reservoir and hydrocarbon source rock distribution and lithologic stratigraphic traps in this basin.

关键词： sequence stratigraphic framework depositional system tract tectonic evolution Yitong graben.