In view of the geological characteristics of low porosity and permeability,anisotropy and structure(such as fracture) of shale gas reservoirs,three-dimensional finite element method was used to study the effects of anisotropy,the influences of anisotropy,inclined angle and the diameters of mine shaft and others on the response of dual laterolog were also studied.The results show that,the anisotropy of shale gas reservoirs has a great effect on the lateral response of shale gas reservoirs,and the response increases with the increase of anisotropy coefficient.The dual laterolog response of the shale gas reservoir is large affected than the isotropic reservoir by borehole size,and the curve changes more intensely.When the other features of the fracture are constant,the bilateral lateral apparent resistivity increases with the inclination of the fracture.This study can provide some theoretical references for the well logging interpretation of shale gas reservoirs.%针对页岩气储层低孔低渗、各向异性突出、构造(如裂缝)发育复杂等地质特征,采用三维有限元法进行数值模拟,研究了水平井中页岩气储层的各向异性、裂缝倾角、井径大小等因素对双侧向测井响应的影响.结果表明,在水平井中,页岩气储层的各向异性对双侧向响应影响较大,响应随各向异性系数的增大而增大;页岩气储层的双侧向响应较各向同性储层的双侧向响应受井眼大小影响更大,曲线变化更剧烈;在裂缝其他特征不变的情况下,双侧向视电阻率随裂缝倾角增大而增大.该研究可对水平井页岩气储层的测井解释提供一定的理论依据.
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