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Volume 46 Issue 6
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(6): 1265-1274
WANG Junqiang, CHEN Anqing, HU Lin, HOU Mingcai, YOU Li, HE Xiaohu, CAO Haiyang, QUE Youyuan, XIONG Fuhao, WANG Wenbo. Combined control mechanism of weathering and tectonics for basement granite of Qiongdongnan Basin, South China Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1265-1274. doi: 10.11781/sysydz2024061265
Citation: WANG Junqiang, CHEN Anqing, HU Lin, HOU Mingcai, YOU Li, HE Xiaohu, CAO Haiyang, QUE Youyuan, XIONG Fuhao, WANG Wenbo. Combined control mechanism of weathering and tectonics for basement granite of Qiongdongnan Basin, South China Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1265-1274. doi: 10.11781/sysydz2024061265
shu

Combined control mechanism of weathering and tectonics for basement granite of Qiongdongnan Basin, South China Sea

doi: 10.11781/sysydz2024061265
  • 1.

    Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 3.

    Hainan Branch, CNOOC, Haikou, Hainan 570311, China

  • Received Date: 2023-10-07
  • Rev Recd Date: 2024-09-28
  • Publish Date: 2024-11-28
    Abstract
  • Reservoirs within buried hills in petroliferous basins represent a unique area of exploration. Recent discoveries in the Mesozoic granite buried hills of the Qiongdongnan Basin in the South China Sea show promising exploration prospects. Among these, the Songnan buried hill group in the basin's central part has rich drilling data, with several wells encountering basal granite reservoirs. Fracturing is crucial for reservoir formation in dense crystalline bedrock, but limited research on fracture characteristics and tectonic stress hampers basement buried hill reservoir exploration. This study examines multi-stage fracture development in the Songnan low uplift buried hill based on core observations, thin-section analysis, well logging, and seismic data from five wells. It analyzes cutting relationships, openness, morphology, orientation, and explores tectonic stresses forming two groups of fractures. Tectonic fractures and dissolution holes along them are the main reservoir spaces within the granite basement. They are categorized into northeast (NE) and northwest (NW) trending families. NE trending fractures result from the Paleo-Tethys Ocean closure during the Indosinian period, influencing NW trending fractures. Tectonic extrusion related to western Pacific Ocean subduction during the Yanshanian period contributes to both NE and NW trending fractures. High-density fractures in granite allow atmospheric and underwater seepage and dissolution, forming a three-layer weathered crust reservoir structure: sandstone conglomerate belts, weathering fracture zones, and inner fracture zones. The extensional detachment background during early Cenozoic rift basin formation activates pre-existing fracture systems, enhancing reservoir space through fracture relaxation.

     

    • All authors disclose no relevant conflict of interests.
    WANG Junqiang and CHEN Anqing were responsible for writing and revising the paper. HOU Mingcai was responsible for the direction of discussion of the thesis. HU Lin, HE Xiaohu, YOU Li, and WANG Wenbo provided data support. CAO Haiyang, QUE Youyuan, and XIONG Fuhao participated in the drawing of the drawings and the writing of some of the contents. All authors have read the last version of the paper and consented to its submission.
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