Integrated seismic study of naturally fractured tight gas reservoirs
Reflection seismic methods are, and will continue to be, the key geophysical tool for imaging these heterogeneities in the subsurface of the earth. However, in spite of great advances in field acquisition techniques and computer processing power, the primary product of conventional seismic work is still only the spatial pattern of reflectivity, which is a measure of velocity variations. Most of the amplitude information goes unused. Although fracture zones may have a reflectivity signature, more often they will not, because of steeply dipping angles, limited offset range in the acquisition, a subtle impedance mismatch, or too thin a fractured zone relative to the wavelength. In fact, there is probably no single seismic attribute that will always tell us what we need to know about fracture zones. Our objective, in the project, is to integrate the principles of rock physics into a quantitative interpretation scheme that exploits the broader spectrum of fracture zone signatures: anomalous compressional and shear wave velocities; Q and velocity dispersion; increased velocity anisotropy amplitude variation with offset (AVO) response. Our goal is to incorporate four key elements: Acquisition and processing of seismic reflection field data. Theoretical studies of the anisotropic signatures of fractured rocks. Laboratory measurements of seismic velocity, velocity anisotropy, and attenuation in reservoir and cap rocks. Integration and interpretation of seismic, well log, and laboratory data, incorporating forward modeling.
- Research Organization:
- Stanford Univ., CA (United States). Dept. of Geophysics
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-91MC28087
- OSTI ID:
- 10119905
- Report Number(s):
- DOE/MC/28087-94/C0291; CONF-931156-5; ON: DE94006019; BR: AB0505000/AB0520000
- Resource Relation:
- Conference: Fuels technology contractors` review meeting,Morgantown, WV (United States),16-18 Nov 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Multi-Attribute Seismic/Rock Physics Approach to Characterizing Fractured Reservoirs
Integrated seismic study of naturally fractured tight gas reservoirs. Technical progress report, April 1, 1993--June 31, 1993