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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2018  >  40(1): 64-70
ZHANG Mengyin, LI Zheng, WANG Jin, HAN Chiyu, LIU Shuang, QIAN Hua. Vertical variation of rocks and minerals in Wufeng-Longmaxi formations in Fuling shale gas field, Sichuan Basin: A case study of well JYA[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(1): 64-70. doi: 10.11781/sysydz201801064
Citation: ZHANG Mengyin, LI Zheng, WANG Jin, HAN Chiyu, LIU Shuang, QIAN Hua. Vertical variation of rocks and minerals in Wufeng-Longmaxi formations in Fuling shale gas field, Sichuan Basin: A case study of well JYA[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(1): 64-70. doi: 10.11781/sysydz201801064
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Vertical variation of rocks and minerals in Wufeng-Longmaxi formations in Fuling shale gas field, Sichuan Basin: A case study of well JYA

doi: 10.11781/sysydz201801064

  • Research Institute of Petroleum Exploration and Development, SINOPEC Jianghan Oilfield Company, Wuhan, Hubei 430223, China

  • Received Date: 2017-10-13
  • Rev Recd Date: 2017-12-04
  • Publish Date: 2018-01-28
    Abstract
  • The Fuling shale gas field is the first to achieve commercial development in China. The well JYA in the Jiaoshiba area of Sichuan Basin was used as an example to study the vertical variation of rock and mineral composition based on thin section observation and scanning electron microscopy (SEM), and combined with X-ray diffraction of whole rock and organic carbon determination. The results showed that quartz and clay minerals are dominant in the Wufeng-Longmaxi shale, accounting for over 70%, followed by feldspar and carbonate, and a small amount of pyrite. From bottom to top, the contents of quartz, feldspar and pyrite gradually decrease, while that of clay minerals increases. The effects of shale mineral vertical variation on shale reservoir property, gas content and compressibility were discussed. With the increase of biogenic silicate and the reduction of clay mineral in vertical direction, the shale shows a tendency of increasing organic matter content, organic matter pore development, shale reservoir performance and shale gas content from top to bottom. At the same time, with the increase of brittle mineral content, the compressible property of shale is also gradually enhanced.

     

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