用反射斯通利波确定地层裂缝宽度和渗透率

Determining Fracture Width and Permeability of a Layer from Reflected Stoneley Wave

为了寻找反演地层裂缝宽度和渗透率的方法，采用平板状裂缝模型和渗透带模型模拟实际地层，根据斯通利波在裂缝性地层和渗透性地层中的传播特性，提出用反射斯通利波反演地层裂缝宽度和渗透率．当声源的中心频率为１ｋＨｚ时．在±５００Ｈｚ的范围内，从合成斯通利波波形中处理得到的反射系数与计算的反射系数相等，反演结果表明，地层裂缝宽度和渗透率的反演值与给定值相符．

Fractured model in flat bed and permeable belt model are used to simulate real medium in order to find a method of inversing fracture width and permeability of formatiom. From the propagation characteristic of Stoneley wave in fractured strata and permeable strata, the reflected Stoneley wave is employed to inverse the fracture width and permeability of the strata. When the central frequency is 1 kHz and its frequency width is ±500 Hz, reflective coefficients from synthetic Stoneley wave are equal to calculated ones. The results show the inverse fracture width and permeability are consistent with given values.