Stress Prediction and Evaluation of Heterogeneous Reservoir

We proposed a new approach for stress prediction and evaluation of heterogeneous reservoir. New azimuthal P wave equation in form of Young’s modulus, Poisson’s ratio and crack density and Differential Horizontal Stress Ratio (DHSR) formula expressed by Poisson’s ratio and crack density which reflects the reservoir stress property were derived. Then, pre-stack angle gathers of different azimuth angle were applied to execute AVAZ inversion for elastic parameters and crack density. We utilized the inverted Poisson’s ratio and crack density to estimate DHSR. The real data application showed that stress predicted result agreed with geology deposition property and the new drilled well interpretation. The novel approach can offer reliable and convenient stress evaluation evidence for heterogeneous reservoir.