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Determination of satur ation exponent in shaly formation

LI Xianpeng   

  1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education,
    Yangtze University, Jingzhou 434023, China
  • Online:2008-06-15 Published:2008-06-15

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Abstract:

Archie formula is important for calculatingwater saturation of the reservoir, but it is only applicable to pure
sandstone reservoirs. In the shaly formation, it is nonlinear relationship between the logarithm of the resistivity index
and the logarithm of water saturation. The saturation exponent changes with resistivity index, with different changes
under different pore structure and shale conditions. According to capillary tube theory, statistical theory, integration
principle and volume model method, the relationship among saturation exponent, shale content, the parameters of pore
structure and the resistivity index in shaly formation is derived, and the saturation exponent of shaly formation under
different condition is determined.

Key words: oolitic beach, dolomitization, reservoir property, Feixianguan Formation, northwestern Sichuan

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