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Structural features and exploration targets of platform margins in Sinian Dengying Formation in Deyang-Anyue Rift, Sichuan Basin, SW China

查看全文 作　　者：ZENG [1,2]Fuying;YANG [2]Wei;WEI [2]Guoqi;YI [3]Haiyong;ZENG [4]Yunxian;ZHOU [4]Gang;YI [2]Shiwei;WANG [4]Wenzhi;ZHANG [5]San;JIANG [2]Qingchun;HUANG [2]Shipeng;HU [5]Mingyi;HAO [2]Cuiguo;WANG [2]Yuan;ZHANG [4]Xuan 高影响力作者 机构地区：[1]College of Geophysics,Chengdu University of Technology,Chengdu 610059,China;[2]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;[3]PetroChina Southwest Oil&Gas Feld Company,Chengdu 610051,China;[4]Exploration and Development Research Institute,PetroChina Southwest Oil&Gas Feld Company,Chengdu 610051,China;[5]School of Geosciences,Yangtze University,Wuhan 430100,China高影响力机构 出　　处：《Petroleum Exploration and Development》索引2023年第50卷第2期,共15页高影响力期刊 基　　金：Supported by the Science and Technology Project of PetroChina (2021DJ0605)。 摘　　要：Based on the seismic, logging, drilling and other data, the distribution, structural types and mound-shoal hydrocarbon accumulation characteristics of platform margins of the Sinian Dengying Formation in the Deyang-Anyue Rift and its periphery were analyzed. Four types of platform margins are developed in the Dengying Formation, i.e., single-stage fault-controlled platform margin, multi-stage fault-controlled platform margin, gentle slope platform margin, and overlapping platform margin. In the Gaoshiti West-Weiyuan East area, single-stage fault controlled platform margins are developed in the Deng 2 Member, which trend in nearly NEE direction and are shielded by faults and mudstones, forming fault-controlled–lithologic traps. In the Lezhi-Penglai area, independent and multi-stage fault controlled platform margins are developed in the Deng 2 Member, which trend in NE direction and are controlled by synsedimentary faults;the mound-shoal complexes are aggraded and built on the hanging walls of the faults, and they are shielded by tight intertidal belts and the Lower Cambrian source rocks in multiple directions, forming fault-controlled–lithologic and other composite traps. In the Weiyuan-Ziyang area, gentle slope platform margins are developed in the Deng 2 Member, which trend in NW direction;the mound-shoal complexes are mostly thin interbeds as continuous bands and shielded by tight intertidal belts in the updip direction, forming lithologic traps. In the Gaoshiti-Moxi-Yanting area, overlapping platform margins are developed in the Deng 2 and Deng 4 members;the mound-shoal complexes are aggraded and overlaid to create platform margin buildup with a huge thickness and sealed by tight intertidal belts and the Lower Cambrian mudstones in the updip direction, forming large-scale lithologic traps on the north slope of the Central Sichuan Paleouplift. To summarize, the mound-shoal complexes on the platform margins in the Dengying Formation in the Penglai-Zhongjiang area, Moxi North-Yanting area and Weiyuan-Ziyang area are large in scale, with estimated resources of 1.58×1012 m3, and they will be the key targets for the future exploration of the Dengying Formation in the Sichuan Basin. 关 键 词：Sichuan Basin Deyang-Anyue Rift structural type of platform margin mound-shoal complex on the platform margin lithologic trap Sinian Dengying Formation exploration direction
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