Tectonic attributes, spatio-temporal evolution and petroleum geological significances of the Tongnan negative structure in the central Sichuan Basin, SW China

TIAN Fanglei, WU Furong, HE Dengfa, ZHAO Xiaohui, LIU Huan, ZHANG Qiaoyi, LE Jingbo, CHEN Jingyu, LU Guo

doi:10.11698/PED.20220859

0 20231014 - 20231014

DOI: https://doi.org/10.11698/PED.20220859

Tectonic attributes, spatio-temporal evolution and petroleum geological significances of the Tongnan negative structure in the central Sichuan Basin, SW China

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1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China;
2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China;
3. Southwest Geophysical Research Institute, BGP, CNPC, Chengdu 610213, China

Received date: 2022-12-26

Revised date: 2023-08-10

Online published: 2023-08-21

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Abstract

The Tongnan secondary negative structure in central Sichuan Basin has controls and influences on the structural framework and petroleum geological conditions in the Gaoshiti-Moxi area. To clarify the controls and influences, the deformation characteristics, tectonic attributes and evolution process of the Tongnan negative structure were investigated through a series of qualitative and quantitative methods such as balanced profile restoration, area-depth-strain (ADS) analysis, and structural geometric forward numerical simulation, after comprehensive structural interpretation of high-precision 3D seismic data. The results are obtained in three aspects. First, above and below the P/AnP unconformity, the Tongnan negative structure demonstrates vertical differential structural deformation. It experiences two stages of structural stacking and reworking: extensional depression (from the Sinian Dengying Formation to the Permian), and compressional syncline deformation (after the Jurassic). The multi-phase trishear of the preexisting deep normal faults dominated the extensional depression. The primary depression episodes occurred in the periods from the end of Late Proterozoic to the deposition of the 1^st-2^nd members of the Dengying Formation, and from the deposition of Lower Cambrian Longwangmiao Formation-Middle-Upper Cambrian until the Ordovician. Second, the multi-stage evolution process of the Tongnan negative structure controlled the oil and gas migration and adjustment and present-day differential gas and water distribution between the Tongnan negative structure and the Gaoshiti and Moxi-Longnusi structural highs. Third, the Ordovician, which limitedly distributes in the Tongnan negative structure and is truncated by the P/AnP unconformity on the top, has basic geological conditions for the formation of weathering karst carbonate reservoirs. It is a new petroleum target deserving attention.

Key words： tectonic attribute; structural evolution; Sinian Dengying Formation; oil and gas; Tongnan negative structure; Gaoshiti-Moxi area; Sichuan Basin

Cite this article

TIAN Fanglei, WU Furong, HE Dengfa, ZHAO Xiaohui, LIU Huan, ZHANG Qiaoyi, LE Jingbo, CHEN Jingyu, LU Guo . Tectonic attributes, spatio-temporal evolution and petroleum geological significances of the Tongnan negative structure in the central Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 0 : 20231014 -20231014 . DOI: 10.11698/PED.20220859

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