基于方位各向异性弹性阻抗的裂缝岩石物理参数反演方法研究

裂缝储层岩石物理参数的准确获得对地下裂缝预测具有重要意义,而叠前地震反演是获得裂缝岩石物理参数的有效手段.本文从裂缝岩石物理等效模型的构建出发,从测井数据上估测了裂缝岩石物理参数,通过推导含裂缝岩石物理参数的方位各向异性弹性阻抗公式,探讨了基于方位各向异性弹性阻抗的裂缝岩石物理参数地震反演方法.实际工区地震数据应用表明,基于方位各向异性弹性阻抗的裂缝岩石物理参数反演方法合理、可靠,可以降低裂缝岩石物理参数估测的不确定性,为地下裂缝预测提供有力的依据.

Seismic inversion for fracture rock physics parameters using azimuthally anisotropic elastic impedance

It is important to obtain the accurate rock physics parameters of fractured reservoirs for underground fractures prediction. Pre-stack seismic inversion is an efficient means to estimate rock physics parameters. This paper begins with the building of fractured rock physics equivalent model. The velocity and fracture rock physics parameters can be estimated from well-log data by using the model. The paper also deduces the azimuthal elastic impedance formula which contains the fracture rock physics parameters. Based on the formula, it presents the method of direct inversion for fracture rock physics parameters using azimuthal elastic impedance. The practical test shows that the method is more stable and reasonable, which leads to reduce the uncertainty for the estimation of fracture rock physics parameters. And the method is a strong tool for fracture prediction.