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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(6): 755-762
Wang Jia, Tan Xianfeng, Tian Jingchun, Luo Chao, Ran Tian, Chen Qing, Li Xia, Zeng Chunlin. Constraints of hydrocarbon migration in Longmaxi shale in Sichuan Basin on shale gas accumulation[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 755-762. doi: 10.11781/sysydz201706755
Citation: Wang Jia, Tan Xianfeng, Tian Jingchun, Luo Chao, Ran Tian, Chen Qing, Li Xia, Zeng Chunlin. Constraints of hydrocarbon migration in Longmaxi shale in Sichuan Basin on shale gas accumulation[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 755-762. doi: 10.11781/sysydz201706755
shu

Constraints of hydrocarbon migration in Longmaxi shale in Sichuan Basin on shale gas accumulation

doi: 10.11781/sysydz201706755
  • 1.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2. School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing 401331, China

  • 3. Exploration and Development Research Institute of Southwest Oil and Gas Field Company, PetroChina, Chengdu, Sichuan 610051, China

  • 4. Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China

  • Received Date: 2017-07-08
  • Rev Recd Date: 2017-10-12
  • Publish Date: 2017-11-28
    Abstract
  • A shale gas reservoir is typically a continuous hydrocarbon reservoir, and its formation and enrichment cannot be separated from the shale. The generation, migration and accumulation of natural gas are the key factors for the effective accumulation of shale gas in shale. The Longmaxi shale in Sichuan Basin has excellent geochemical parameters and reservoir characteristics as indicated by organic geochemical analysis, X-ray diffraction and scanning electron microscopy and on drilling and outcrop data. We studied the tectonic evolution of well PY1 in Sichuan Basin and the thermal evolution history of organic matter in the Longmaxi shale. Compared to the Barnett shale, the Longmaxi shale was buried deeper, and was preserved in an open state due to tectonic activity, which was unfavorable for free gas accumulation. Kerogen in the Longmaxi shale belongs to types I and Ⅱ. The early formed hydrocarbons discharged out of the shale in the form of oil, and only the late formed, overmature gas and secondary gas (from oil cracking) remained in the shale system, restricting the effective accumulation of shale gas to some extent.

     

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