Reservoir fluid substitution effects on seismic profile interpretation: A physical modeling experiment

Details Reservoir fluid substitution effects on seismic profile interpretation: A physical modeling experiment Reservoir fluid substitution effects on seismic profile interpretation: A physical modeling experiment

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3710306w&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 10, CiteID L10306

Physics

Geophysics

Exploration Geophysics: Seismic Methods (3025, 7294), Exploration Geophysics: Data Processing, Structural Geology: Role Of Fluids

Scientific paper

P-wave seismic surveys are performed on realistic physical models of a reservoir formed of interbedded sand and shale layers and filled with gas, water, and oil. They show characteristic behaviour which can be used to distinguish between fluids, with significant implications for the interpretation of time-lapse experiments. Discontinuous reflections originate in gas-filled reservoirs, with widely varying amplitude compared to oil- or water-filled reservoirs. Anomalous changes in seismic amplitude difference attributes for reflections within the reservoir are seen for gas/oil substitution. Oil/water substitution results in only weak variations of reservoir elastic properties, thus amplitude difference attributes may be unsuitable for monitoring changes in oil/water saturation. However, direct differences between the time traces are strong. On time-lapse sections, strong amplitude difference anomalies do not necessarily correspond to the region where the fluid variations occur; this is significant for monitoring oil field development by water injection.

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