--> Abstract: Dynamic Reservoir Characterization: Application of Time-Lapse (4-D), Multicomponent Seismic to a CO2 EOR Project, Vacuum Field, New Mexico, by S. L. Roche, T. L. Davis, R. D. Benson, and L. Duranti; #90905 (2001)
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Dynamic Reservoir Characterization: Application of Time-Lapse (Previous Hit4-DNext Hit), Multicomponent Previous HitSeismicNext Hit to a CO2 EOR Project, Vacuum Field, New Mexico

S. L. Roche1, T. L. Davis2, R. D. Benson2, and L. Duranti2
1Output Exploration, LLC
2Colorado School of Mines

A time-lapse (Previous Hit4-DNext Hit), multicomponent (9-C), Previous HitseismicNext Hit Previous HitdataNext Hit survey was acquired, processed and interpreted in conjunction with a CO2 Enhanced Oil Recovery (EOR) project at Vacuum Field, New Mexico, USA. The CO2 injection program induced bulk rock property variations due to fluid saturation and pore pressure changes associated with reservoir production processes. Previous HitSeismicNext Hit monitoring utilized four separate 9-C Previous HitseismicNext Hit surveys to form a dynamic reservoir characterization of the San Andres reservoir in the study area.

Interpretation of the P-wave and S-wave Previous HitdataNext Hit volumes, and integration with geological and reservoir engineering Previous HitdataNext Hit, demonstrate that changes in bulk rock properties associated with the CO2 injection program could be detected using multicomponent surface Previous HitseismicNext Hit Previous HitdataNext Hit. The primary Previous HitseismicNext Hit attribute used to detect the Previous Hit4-DNext Hit response was variations in shear wave anisotropy.

Acquisition of the time-lapse (Previous Hit4-DNext Hit), multicomponent Previous HitdataNext Hit included generating both P-wave and S-wave energy at each source location using vibrator source units. Each receiver location recorded three components of the Previous HitseismicNext Hit wavefield resulting in a full 9-C Previous HitseismicNext Hit survey over the project area. Previous HitDataNext Hit acquisition of the surface Previous HitseismicNext Hit Previous HitdataNext Hit was augmented with the simultaneous recording of a single, 3-C geophone, positioned in a wellbore centrally located in the survey area at a depth of 1000 m.

A Previous HitdataNext Hit Previous HitprocessingNext Hit methodology for time-lapse, multicomponent, Previous HitseismicNext Hit survey was developed and applied to the P-wave and S-wave Previous HitdataNext Hit volumes. Significant features of the Previous HitdataNext Hit Previous HitprocessingNext Hit method are application of surface consistent processes, windowed crosscorrelation of common-trace pairs between the initial and repeat surveys with subsequent decomposition to source and receiver components, and the use of information from the downhole 3-C geophone to constrain P-wave and S-wave Previous HitdataNext Hit Previous HitprocessingTop.

AAPG Search and Discovery Article #90905©2001 AAPG Southwest Section Meeting, Dallas, Texas