裂缝等效介质模型对裂缝结构和充填介质参数的适应性
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition)（2013）
Abstract
基于裂缝各向异性等效介质模型:定量分析了纵横波速度、弹性刚度张量随裂缝密度、裂缝孔隙纵横比及孔隙充填流体性质的变化规律；考察了Hudson模型、Pade近似和Liu含裂缝介质模型的适用条件和精度；重点分析了裂缝孔隙的结构参数、孔隙度大小及充填流体性质对弹性模量和纵横波速度的影响.基于Hudson模型的Pade近似,明确了它对高裂缝密度和大纵横比的适应性.Hudson模型、Pade近似和Liu含裂缝介质模型的响应模拟表明:在裂缝密度小于0.1时,Liu模型和Hudson二阶近似的响应基本一致,Liu模型和Pade近似均适用于裂缝密度小于等于0.2的裂缝介质；裂缝密度大于0.2时,前者适应性更好些.另外,纵横比对饱水裂缝介质标准化刚度模量的影响较干裂缝介质的影响大.
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Key words
Anisotropic effective medium,Aspect ratio,Compressive and shear wave velocities,Density,Elastic stiffness modulus,Fluid filled in fracture porosity,Fracture
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