Abstract

Exploration and development of naturally Fractured Basement reservoir is a challenging task. Often the real challenge is not limited to identification of Fractured Basement but is associated with Fracture preservation and performance of reservoir/wells. In the current work Seismic Anisotropy resulting from the preferred orientations of basement fractures has been leveraged. Seismic wavefront in the presence of fractures splits into two transverse directions one along the discontinuity and other across it; this phenomenon gives rise to Azimuthally Varying Amplitudes and Velocities (AVAz & VVAz). An ideal seismic dataset for such analysis should consist of all azimuths but the vintage data utilized in the current work has limited azimuthal coverage. The current work focusses on determining Fracture Intensities w.r.t nature of Reservoir flow as well as fracture orientations from seismic data followed by calibration with image logs. Fracture orientation derived in the form of displacement vectors have found to be great value. Additionally, AVAz intensity can be related to reservoir performance.