Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (6): 720-725,731.doi: 10.11743/ogg20090608

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Current terrestrial stress direction of the Shaximiao Formation in the Yanjinggou Structure of the West Sichuan Depression

Deng Hucheng1, Zhou Wen1,2, Jiang Haogang3, Jiang Wenli4   

  1. 1. Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan 610059, China;
    3. SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China;
    4. Strategic Research Center of Oil & Gas Resources, Ministry of Land & Resources, Beijing 100034, China
  • Received:2009-10-20 Online:2009-12-25 Published:2012-01-16

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Abstract:

Reservoir of the Shaximiao Formation in the West Sichuan Depression is of low porosity and permeability.To know the current terrestrial stress direction is the basis for effective fracturing in this area.Through tracking down the P-wave direction of natural earthquakes in the West Sichuan Depression over the years and referring to researches on current terrestrial stress direction in adjacent structures,the current terrestrial stress direction of the study area is analyzed and predicted.By the paleomagnetic directional experiments and velocity anisotropy experiment with single-well core,the maximum principal stress direction is measured and calculated.The results show that the calculated current terrestrial stress direction is consistent with that of the adjacent structures.Eventually,according to various data and experimental results,the current terrestrial stress direction of the Shaximiao Formation in the study area is determined to be a NW direction.

Key words: natural earthquake, velocity anisotropy, current terrestrial stress direction, Shaximiao Formation, Yanjinggou Structure, West Sichuan Depression

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