利用纵波AVA进行裂缝储层和流体识别

摘要

裂缝储层的地震响应表现为各向异性,描述裂缝物理特征参数正柔量和剪切柔量是裂缝密度函数.含气裂缝和含油、水裂缝的剪切柔量相等;而含气时,正柔量不为零,含油、水时,正柔量为零.横波分裂能反演裂缝密度和方位,但是不能指示裂缝中流体类型.近年来,纵波速度和振幅的方位特征检测裂缝得到了广泛应用,这里根据线性滑动模型建立了描述裂缝物理特性参数和各向异性参数之间的关系,分析了流体类型识别的可行性,并利用多方位角纵波AVO反演各向异性参数和柔量参数,以此来预测裂缝中流体类型.%The seismic response of fracture reservoir is anisotropy. It is the density function that the fracture characteristic is described by the positive soft measure quantum and shear soft measure quantum .The shear soft measure quantum of gas fracture is equal to that of oil and water fracture. But the positive soft measure quantum of gas fracture is not equal to zero, and the positive soft measure quantum of oil and water fracture is equal to zero. It can not show fluid type of fracture in despite of it can be gotten that the density and azimuth of fracture by S-wave (after split). Recently, it is applied widely that the fracture is detected by P-wave velocity and amplitude's azimuth character. This paper shows that the relation of describing fracture characteristic parameter and anisotropy parameter is gotten by the linear slip interfaces model. After analyzing the possibility of recognizing fluids type in the fracture, the anisotropy parameter and soft measure quantum parameter are gotten by P-wave AVO inversion using multi azimuth which can be used to recognize fluid type in the fracture reservoir.