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Influence of Multi-Period Tectonic Movement and Faults on Shale Gas Enrichment in Luzhou Area of Sichuan Basin, China

Author

Listed:
  • Xuewen Shi

    (Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China)

  • Wei Wu

    (Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China)

  • Yuguang Shi

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum, Beijing 102249, China)

  • Zhenxue Jiang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum, Beijing 102249, China)

  • Lianbo Zeng

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China)

  • Shijie Ma

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China)

  • Xindi Shao

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum, Beijing 102249, China)

  • Xianglu Tang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum, Beijing 102249, China)

  • Majia Zheng

    (Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China)

Abstract

The Luzhou area in the southern Sichuan Basin has experienced multiple tectonic movements, forming a complex fault system; the activity has an important impact on the enrichment of shale gas in this area. In order to reveal the influence of the fracture system on the differential enrichment of shale gas, this paper takes the southern Sichuan Basin as the research object. The structural evolution process and fracture development characteristics of the different tectonic units in Luzhou area of southern Sichuan were characterized by conducting a seismic profile analysis, structural recovery using a back-stripping method, and core hand specimen description. We clarified the control effect of the structural deformation and fracture on the differential enrichment of shale gas, and we established a differential enrichment model of shale gas in the Luzhou area. The results show that: (1) The Luzhou area has undergone the transformation of a multi-stage tectonic movement. There are many sets of detachment structures in the longitudinal direction, and the plane structural form is a thin-skin fold-thrust belt composed of wide and narrow anticlines in the north–south direction. (2) The faults in the study area are affected by the Himalayan tectonic movement. The high-angle reverse faults are developed, and the number of large faults is small. The second and third faults are mainly developed. The second faults are only developed at the high position of the structure, which has a significantly destructive effect on shale gas reservoirs, while the third and fourth faults have no significant destructive effect on shale gas reservoirs. (3) In the study area, the types of cracks are categorized into transformational shear cracks, bed-parallel shear cracks, intraformational open cracks, lamellation cracks, shrinkage cracks, and abnormal high-pressure cracks. The thickness of the shale rock mechanical layer, brittle mineral content, and organic matter content jointly control the crack development degree in the shale of the Wufeng–Longmaxi Formation. (4) The uplift erosion, structural deformation, and fracture development caused by the structural evolution have affected the preservation of shale gas, resulting in the differential enrichment of shale gas reservoirs in the region. Based on the enrichment factors of shale gas, we established a differential enrichment model of shale gas in typical structural units and optimized the favorable enrichment areas, which are important contributions for guiding shale gas exploration and development in the Sichuan Basin.

Suggested Citation

  • Xuewen Shi & Wei Wu & Yuguang Shi & Zhenxue Jiang & Lianbo Zeng & Shijie Ma & Xindi Shao & Xianglu Tang & Majia Zheng, 2022. "Influence of Multi-Period Tectonic Movement and Faults on Shale Gas Enrichment in Luzhou Area of Sichuan Basin, China," Energies, MDPI, vol. 15(18), pages 1-25, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:18:p:6846-:d:919200
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    References listed on IDEAS

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