Abstract: Theoretically, the anisotropy of subsurface medium resulted from fractures in approximately same strike can be characterized and predicted using the variation of reflection amplitude of P-wave seismic date with azimuth. The target stratum in studied area is carbonate reservoir of shallow-middle depth, which are characterized by the seismic data of wide-azimuth, high-fold and high S/N ratio. The technology of amplitude preservation is carefully used during seismic data processing for preserving amplitude variation from azimuth AVO and avoiding amplitude abnormity produced from acquirement and processing. The technologies of macro-binning and pre-stack time migration (PSTM) are used for improving the imaging quality of target stratum. Based on the PSTM data volumes of 5 different azimuthal angles, the strike and intensity of fractures in studied area are predicted. Along with the geologic data and the characteristic of P-wave azimuthal AVL, the prediction results are analyzed and discussed.

Key words: carbonate rock, fracture, P-wave, amplitude, azimuth, pre-stack time migration