Aligned vertical fractures, HTI reservoir symmetry,
and Thomsen seismic anisotropy parameters

James G. Berryman

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ABSTRACT

The Sayers and Kachanov (1991) crack-influence parameters are shown to be directly related to Thomsen (1986) weak-anisotropy seismic parameters for fractured reservoirs when the crack/fracture density is small enough. These results are then applied to the problem of seismic wave propagation in reservoirs having HTI symmetry due to the presence of aligned vertical fractures. The approach suggests a method of inverting for fracture density from wave speed data.