Monoclinic Rock Physics Model for Multiple Cracked Media

Summary Deep fractured reservoirs develop complex crack distribution characteristics, including low-angle bedding cracks and high-angle structural cracks, exhibiting complex monoclinic anisotropy. However, current crack rock physics models focus on the parallel aligned cracks without considering the crack distribution characteristics. In this paper, based on the complex crack distribution characteristics and anisotropic effective medium theory, the Bond transform matrix and Gaussian function are introduced to establish a monoclinic rock physics model for characterizing the complex crack distribution characteristics dominated by low-angle bedding cracks and high-angle structural cracks. Analysis indicates that crack distribution characteristic parameters, including the average crack inclination, the standard deviation of crack inclination angle and the integral interval of crack inclination angle can accurately characterize the variation of elastic modulus of monoclinic medium.