基于各向同性双孔隙度模型的各向异性岩石物理模型及其应用

Anisotropic petrophysical model based on isotropic dual porosity model and its application

为对各向异性孔隙介质进行储层参数评价和岩石性质预测,在各向同性双孔隙度(IDP)模型基础上建立了新的各向异性地层的岩石物理模型。新模型综合考虑了岩石速度的各向异性、岩石的泥质含量以及粘土颗粒等矿物在地层中不规则排列的影响,采用差分有效介质理论(DEM)与自适应近似理论(SCA)相结合的方法计算干岩样骨架的弹性模量,用Brown和Korringa模型计算流体驱替参数。现场应用结果表明,各向异性岩石物理模型的散射和测量误差非常小,应用效果明显优于IDP模型。

In order to develop a general model to estimate reservoir parameters and predict rock properties in anisotropic porous media, an anisotropic petrophysical model was proposed based on isotropic dual porosity（IDP） model, in which the anisotropy of rock velocity, the shale content of rock and the anomalous array of the mineral were considered. Anistropic differential media （DEM） theories and self-consistent approximation （SCA） theories were used to calculate the elastic moduli for a dry rock frame of rocks with aligned pore distributions. The fluid displacement parameters were calculated using Brown and Korringa model. Applied to the field data, the results show＂ that the scattering deviation and measuring error of the model are little, and the model indicates a greater value in processing the comprehensive data of anisotropic rocks than IDP model does.