Abstract：When gas reservoirs are in sandstone and shale,it is very difficult to distinguish them from surrounding rocks using conventional acoustic impedance inversion methods because reservoir P-wave velocity decreases.But based on logging data analysis,the Poisson's ratio of reservoirs is diffe-rent from that of surrounding rocks.So Poisson's ratio is the key parameter to identify this kind of reservoirs.This paper presents a method which uses the high accuracy of zero-offset VSP data to obtain accurate P-wave and S-wave velocities,and then the Poisson's ratio curve at well site.At the same time,we can get P-wave and S-wave sections from offset VSP data,which can be translated to AI,EI and Poisson's ratio sections by joint P-wave and S-wave inversion.The prediction is made on Poisson's ratio sections.Prediction results obtained by this method in SLG gasfield match very well with drilling.
杜金玲, 蔡银涛, 张固澜, 李陶, 刘振亚, 付京会. VSP资料在储层预测中的应用[J]. 石油地球物理勘探, 2013, 48(2): 268-272.
Du Jinling, Cai Yintao, Zhang Gulan, Li Tao, Liu Zhenya, Fu Jinghui. VSP data application in reservoir prediction. OGP, 2013, 48(2): 268-272.
