Integrated Seismic/Rock Physics Approach to Characterizing Fractured Reservoirs

摘要

We have presented an interpretation and integration strategy for detecting and characteriz-ing natural fractures in rocks. We used a formalism based in probability theory to integrate prior geologic models of fracture occurrence, geophysical (log and seismic) data and theoretical rock physics models linking fractures, background rock properties and observable seismic attributes. In a field study of a fractured tight limestone, we find agreement between the mean fracture orientations derived from the azimuthal variation of the seismic amplitudes at far offsets and the fracture orientations derived from the FMI logs from a nearby well. There also is agreement between the mean fractures' strike from azimuthal variation of amplitude and the present regional stress field.