西南石油大学学报(自然科学版)

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Acoustic Properties of Low Permeability Cores and its Application to#br# Reservoir Gas Predication

Fan Yiren1,2*, Xing Donghui1,2, Deng Shaogui1,2, Li Runze3, Ge Xinmin1,2   

  1. 1. College of Geosciences,China University of Petroleum,Qingdao,Shandong 266580,China
    2. CNPC Key Laboratory of Well Logging,China University of Petroleum,Qingdao,Shandong 266580,China
    3. Natural Gas Development Company,Qinghai Oilfield Company,PetroChina,Germu,Qinghai 816000,China
  • Online:2015-10-01 Published:2015-10-01

Abstract:

To solve the problem in qualitative identification and quantitative prediction of gas content in low permeability
reservoir,an acoustic rock physics experiment was carried out which simulates the reservoir conditions and a quantitative
research of the influence of confining pressure,pore pressure,effective stress and pore fluid on compression and shear wave
velocity was done. Then the relationship between compression and shear wave velocity,elastic parameters and the gas saturation
was systematically analyzed. And the experimental result was checked with Krief elastic parameters prediction method. The
experimental results and numerical simulations show that the acoustical properties are affected by combination of factors such
as porosity,pressure,fluid property etc.,and shear wave velocity ratio-wave impedance intersection and compression and shear
wave square intercept can be used to identify gas. The ability of using acoustic logging data to identify reservoir fluid can be
improved with the two methods.

Key words: low permeability rocks, pressure, wave velocity, gas content, intersection method

CLC Number: