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DOI: https://doi.org/10.11698/PED.20220655

The timing and evolution of the strike-slip faults in the central Sichuan Basin, SW China

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  • 1. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China

Received date: 2022-09-25

  Revised date: 2023-02-06

  Online published: 2023-02-20

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Abstract

Based on 3D seismic and drilling data, the timing, evolution and genetic mechanism of deep strike-slip faults in the central Sichuan basin are thoroughly examined by using the U-Pb dating method of fault-filled carbonate cement and seismic-geological analysis methods. The results show the strike-slip fault system was initially formed in the Late Sinain, basically finalized in the Early Cambrian with dextral transtensional structure, was overlaid with at least one stage of weak transpressional deformation before the Permian, then was reversed into a sinistral weak transtensional structure in the Late Permian. Only a few of these faults were selectively activated in Indosinian and later periods. The strike-slip fault system was affected by the preexisting structures such as Nanhua rifting normal faults and NW-striking deep basement faults. It is an oblique accommodated intracratonic transfer fault system developed from the Late Sinian to Early Cambrian to adjust the uneven extension of the Anyue trough from north to south, and matches the Anyue trough in evolution time and intensity. In the later stage, multiple inversion tectonics and selective activation occurred under different tectonic backgrounds.

Key words： strike-slip fault; fault timing; fault evolution; seismic-geological analysis; U-Pb dating; faulting mechanism; cratonic; Sichuan Basin

Cite this article

MA Bingshan, LIANG Han, WU Guanghui, TANG Qingsong, TIAN Weizhen, ZHANG Chen, YANG Shuai, ZHONG Yuan, ZHANG Xuan, ZHANG Zili . The timing and evolution of the strike-slip faults in the central Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 0 : 20230415 -20230415 . DOI: 10.11698/PED.20220655

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