With the interest to map azimuthal variation of horizontal stress as well as to improve the signal-to-noise ratio of unconventional resource plays, wide/full azimuth seismic data acquisition has become common. Migrating seismic traces into different azimuthal bins costs no more than migrating them into one bin. If velocity anisotropy is not taken into account by the migration algorithm, subtle discontinuities and some major faults may exhibit lateral shifts, resulting in a smeared image after stacking. Based on these two issues, we introduce a new way to compute coherence for azimuthally limited data volumes. Like multispectral coherence, we modify the covariance matrix to be the sum of the covariance matrix of each azimuthally limited volume, then use the integrated covariance matrix to compute the coherent energy.
Presentation Date: Wednesday, September 27, 2017
Start Time: 3:05 PM
Location: 340A
Presentation Type: ORAL
