Summary

The results presented in this paper are: 1) The azimuthal variation of the near-offset amplitudes (7o ) best matched the calibration data of the Star Trak image log and micro-seismic (m-s) data; the AVOaz results were acceptable, but did not match as well as the 7o angle of incidence azimuthal amplitudes; 2) the m-s events for most of the frac stages studied showed the NE-SW spatial distribution indicating a NE-SW maximum horizontal stress orientation, consistent with the NE-SW azimuth of VINTfast; 3) at several frac stage centers, the m-s events showed detailed spatial patterns that track the azimuth and density of the natural fractures as interpreted from azimuthal amplitudes, specifically, the 7o angle of incidence azimuthal amplitudes. 4) To explain the m-s data, knowledge of the in-situ stress (azimuthal VINT)

and

the natural fractures (azimuthal amplitudes) must be used.

Keywords:
amplitude, negative avo gradient, gradient, avo gradient, modeling, average avo gradient, carbonate, seg denver 2014, azimuth, fracture parallel
Subjects:
Reservoir Characterization, Seismic processing and interpretation
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2014. Society of Exploration Geophysicists
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