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0 20230403 - 20230403

DOI: https://doi.org/10.11698/PED.20220456

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

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  • 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

Received date: 2022-11-13

  Revised date: 2023-01-15

  Online published: 2023-01-31

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Abstract

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.

Key words： structural type of platform margin; mound-shoal complex on the platform margin; lithologic trap; Sichuan Basin; Deyang-Anyue Rift; Sinian Dengying Formation; exploration direction

Cite this article

ZENG Fuying, YANG Wei, WEI Guoqi, YI Haiyong, ZENG Yunxian, ZHOU Gang, YI Shiwei, WANG Wenzhi, ZHANG San, JIANG Qinchun, HUANG Shipeng, HU Mingyi, HAO Cuiguo, WANG Yuan, ZHANG Xuan . Structural features and exploration direction of platform margins in Sinian Dengying Formation in Deyang-Anyue Rift, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 0 : 20230403 -20230403 . DOI: 10.11698/PED.20220456

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