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Volume 44 Issue 1
Jan.  2022
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2022  >  44(1): 41-50
PENG Xianfeng, DENG Hucheng, HE Jianhua, LEI Tao, ZHANG Yeyu, HU Xiaofei. Characteristics and genesis of fractures in Middle Ordovician Majiagou Formation, Daniudi Gas Field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(1): 41-50. doi: 10.11781/sysydz202201041
Citation: PENG Xianfeng, DENG Hucheng, HE Jianhua, LEI Tao, ZHANG Yeyu, HU Xiaofei. Characteristics and genesis of fractures in Middle Ordovician Majiagou Formation, Daniudi Gas Field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(1): 41-50. doi: 10.11781/sysydz202201041
shu

Characteristics and genesis of fractures in Middle Ordovician Majiagou Formation, Daniudi Gas Field, Ordos Basin

doi: 10.11781/sysydz202201041
  • 1.

    College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2.

    Sichuan Energy Industry Investment Group CO., LTD., Chengdu, Sichuan 610095, China

  • 3.

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

  • 4.

    Exploration and Development Research Institute, North China Oil and Gas Company, SINOPEC, Zhengzhou, Henan 450006, China

  • 5.

    Sichuan Keyuan Testing Center of Engineering Techonology, Chengdu, Sichuan 610073, China

  • Received Date: 2021-03-30
  • Rev Recd Date: 2021-11-19
  • Publish Date: 2022-01-28
    Abstract
  • The Daniudi Gas Field in the Ordos Basin has great natural gas potential, but a variety of fractures with complex origins was developed in the weathering crust karst reservoirs in the Middle Ordovician Majiagou Formation. In order to study the characteristics of fractures in the reservoirs, petrology and logging techniques were used to compare the differences between the fractures caused by steep ridges and structural fractures in terms of fracture development frequency, effectiveness, period, occurrence layer, shape, dip angle, etc. With elastic theory and fracture mechanics theory, the stress component at the end of fractures was analyzed, and the cause of the steep ridge fractures was discussed. Results show that the fractures caused by steep ridges are mainly vertical fractures and high-angle fractures. The fracture extension direction and fracture shape are irregular, and the fracture surface is uneven, with the characteristics of wide top and narrow bottom, and no bifurcation at the tail end. There is dissolution between the fractures, which is in a non- to semi-filled state, and the effectiveness of the fractures is high. The steep ridge fractures were controlled by factors such as ancient steep slope angle, rock layer inclination, initial fracture density and rock mechanical properties. Compared to structural fractures, the steep ridge fractures are more favorable for hydrocarbon migration. Studying the characteristics and causes of steep ridge fractures will help to further understand the distribution of weathered crust karst reservoirs, and identify favorable areas for the next exploration and development of the Daniudi Gas Field.

     

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