Rotated staggering grid forward modeling in fractured medium

The practice of oil exploration proves that the fractures are the storage space of oil and gas and channels of them to move, thereby the wave-field of cracked media draws more and more attention. The actual fractured reservoir is influenced by many factors and its physical properties are complex, showing strong anisotropy. There only exist high dip-angle cracks because the pressure in the overlying strata makes only a few of horizontal or low dip angle cracks exist. It will be convenient for the practical application if fracture reservoir is equivalent to HTI medium by linear slip theory. This paper simulated and analyzed two-component records based on the anisotropic elastic wave rotated staggered grid modeling. The result shows that the existence of the crack is equivalent to increase the reflection interface artificially. The larger the crack density is, the smaller the aspect ratio is, the greater the difference between background and fracture fillings is, and the larger the change caused by reflection wave energy is. The result provides a basis for the reservoir identification and prediction when using the seismic data.