摘要
对四川盆地碳酸盐岩地层28块岩样不同含气饱和度下衰减特性的超声波测试表明:①纵波衰减随含气饱和度的增加呈先增大后减小的趋势,当含气饱和度处于0.4～0.6范围时衰减出现一个峰值;横波衰减则随含气饱和度增加呈线性减小,变化幅度相对纵波较小。②含气饱和度对纵波衰减的影响程度随频率增加而变大。③对纵波而言,含气饱和度对衰减的影响程度随孔隙度的增加而变大;对横波而言,含气饱和度高于0.6时受孔隙度的影响不明显,含气饱和度低于0.3时,随孔隙度的增加而增大。
The ultrasonic tests of 28 carbonate samples with different gas saturation from Sichuan Basin for energy attenuation characteristics were conducted and the results show that: ①P-wave and S-wave attenuation coefficients are different.With the gas saturation increase,P-wave attenuation increases firstly and then decreases.The maximum attenuation coefficient appears when gas-saturation in the range of 0.4~0.6.S-wave attenuation shows linear decrease with gas saturation increase,and its attenuation coefficient is smaller than that of P-wave.②For a given gas saturation,P-wave attenuation increases with frequency increase.③For a given gas saturation,P-wave attenuation increases with the porosity increase.With the porosity increase,S-wave attenuation has little increase when the gas-saturation is higher than 0.6,but much larger increase when the gas-saturation is less than 0.3.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2012年第6期926-930,1024+840,共5页
Oil Geophysical Prospecting
基金
中国石油科技创新基金项目(2009D-5006-03-02)资助
