Seismic analysis for fractured reservoirs of south Komie 3D data

Khaled Al Dulaijan, Gary F. Margrave

The South Komie 3D seismic data was acquired within the Horn River basin of northeast British Columbia. The Horn River basin has two main targets of shale gas: the Muskwa and Evie formations. Even though being an unconventional reservoir, standard seismic techniques are quite useful for such reservoirs. South Komie 3D seismic data is analyzed to identify gas sweet spots. Because the reservoirs consist of shale. Fractures are important because they can act as fluid conduits. There, the data is analyzed to identify fractures as well.

In this study, a strong channel system is observed within the near surface. The post-stack P-impedance inversion can help indicating sweet spots within Evie and Muskawa reservoirs. Also, post-stack amplitude, instantaneous frequency, and curvature attributes are useful for identifying fracture direction and intensity. Results of amplitude and instantaneous frequency correlate very well with in Evie reservoir. AVO analysis was found to help identifying top and base of Evie gas away from the well.