Computational methods for improving the resolution of subsurface seismic images. Progress report, September 15, 1991--September 14, 1993
Our interactive modeling for Gaussian beam modeling in two-dimensional, triangulated complex geologic structure, has been generalized to include transmission losses at interfaces, and density and Q-characterization of attenuation in layers. Also, multiple reflections and the option to model data from VSP acquisition geometry have been included. Shortcomings when the structure contains first-order discontinuities, however, limit the full geologic complexity that presently can be modeled by the Gaussian beam method. Other studies of wave filtering that arises for waves propagating nearly parallel to bedding reveal the importance of tunneling evanescent filtering on the propagating wavelet. Likewise, for reflections from steep interfaces, we have developed a dip-divergence correction to compensate for shortcomings in the conventional divergence correction for energy spreading. A new direction this past year, which we will be pursuing in the year ahead is analysis of errors in migration and dip-moveout (DMO) that arise when conventional imaging processing, which ignores anisotropy, is applied to data acquired where the subsurface is transversely isotropic. We are also developing approaches for taking anisotropy into account in these important imaging processes. Similarly, we have developed an efficient approach to performing DMO on P-SV-mode-converted data. Our interests in taking anisotropy into account have led us to study the importance of anisotropy in the overburden on reflection amplitude variations with offset (AVO).
- Research Organization:
- Colorado School of Mines, Golden, CO (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-89ER14079
- OSTI ID:
- 10159954
- Report Number(s):
- DOE/ER/14079-24; ON: DE93015882
- Resource Relation:
- Other Information: PBD: May 1993
- Country of Publication:
- United States
- Language:
- English
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