西南石油大学学报(自然科学版)

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Theoretical Simulation and Analysis Factors of Resistivity in
Vuggy Reservoir

Zhang Zhaohui1, Gao Chuqiao2, Gao Yongde3   

  1. 1. Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou,Gansu 730020,China
    2. School of Geophysics and Oil Resource,Yangtze University,Jingzhou,Hubei 434023,China
    3. Research Institute of West of South Sea,CNOOC,Zhanjiang,Guangdong 524057,China
  • Online:2014-04-01 Published:2014-04-01

Abstract:

Because of the many factors influencing the resistivity of carbonate reservoir and the complex conductive mechanism,
it is difficult to identify the reservoir and interpret the property of fluids. On the basis of pore-structure physical model,
we simulated the resistivity of reservoir,and analyzed the factors which affect the resistivity of reservoir. The factors include
the throat size,the resistivity of formation water,and the resistivity of matrix,and the vuggy size,and so on. At last,the
influencing degree to resistivity of reservoir is discussed and the reason of abnormal resistivity in carbonate is interpreted in
this paper. The resistivity of reservoir gradually reduces with the throat diameter increasing,and increases as the resistivity of
matrix and formation water increases. Vuggy extension influence on resistivity along the direction of the current is higher than
that along the vertical current direction. With the vuggy size along current direction increasing,the resistivity reduces. The
effect of throat diameter on the resistivity of reservoir is bigger than vuggy size. The effect of throat diameter on the resistivity
of completely water-saturated rocks is bigger than on completely oil-saturated rocks,but for the resistivity of the matrix and
the formation water,the extended direction and size of the vuggy,the condition is opposite.

Key words: vuggy reservoir, pore structure, physical model, theoretical simulation, resistivity