--> Abstract: Rock Physics and Seismic Modeling Guided Application of 4-D Seismic Attributes to Monitoring Enhanced Oil Recovery CO<SUB>2</SUB>-Flood in a Thin Carbonate Reservoir, Hall Gurney Field, Kansas, U.S.A., by Abdelmoneam E. Raef, Richard D. Miller, Alan Byrnes, and William E. Harrison; #90039 (2005)
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Rock Physics and Previous HitSeismicNext Hit Modeling Guided Application of Previous Hit4-DNext Hit Previous HitSeismicNext Hit Attributes to Monitoring Enhanced Oil Recovery CO2-Flood in a Thin Carbonate Reservoir, Hall Gurney Field, Kansas, U.S.A.

Abdelmoneam E. Raef, Richard D. Miller, Alan Byrnes, and William E. Harrison
Kansas Geological Survey, Lawrence, KS

Use of time-lapse Previous HitseismicNext Hit to monitor enhanced oil recovery (EOR) programs in carbonates has seen limited success. This has been due to various non-Previous HitseismicNext Hit factors such as the highly heterogeneous nature of carbonates, diagenetic complications of porosity distribution, shallow depth and thinness of many carbonate reservoirs, and low compressibilities that reduce fluid-effect. Other complications related to Previous HitseismicNext Hit imaging include resolution limitations, low signal-to-noise ratios, low-fold coverage at shallow depths, near-surface irregularities, and small-field economic constraints.

Following unconventional approaches to survey design, Previous HitdataNext Hit acquisition, and Previous HitdataNext Hit Previous HitprocessingNext Hit and interpretation, high-resolution time-lapse/4D Previous HitseismicNext Hit surveying effectively imaged movement of miscible CO2 through a thin (about 5 m), shallow (about 900 m), Oomoldic limestone reservoir during a tertiary oil recovery program. Extremely short survey-to-survey temporal separations (two months) between high-resolution time-lapse surveys enabled the evaluation of high-resolution time-lapse Previous HitseismicNext Hit sensitivity to changes in pore-fluid composition. Simulations uniquely displaying reservoir heterogeneities using rock physics and Previous HitseismicNext Hit attributes clearly depict a well constrained fluid flow scenario that is consistent with production Previous HitdataNext Hit.

Selected 4D-seismic attribute maps that have undergone weak-anomaly enhancement through color balancing successfully monitored the movement of the injected miscible EOR-CO2 front and illuminated bypassed hydrocarbon areas. Rock physics and Previous HitseismicNext Hit modeling aided the understanding of response of Previous HitseismicTop attributes to both effective pore-fluid and geometrical time thickness variations in this thin carbonate target.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005