Reservoir modeling of a thin carbonate reservoir using geostatistics and 4-D seismic attributes, Weyburn field, Saskatchewan, Canada

Enhanced oil recovery through CO2 injection is a commercially<br>proven technology and allows additional<br>recovery of typically 10-15% of the OOIP. Time-lapse<br>seismic data provide a valuable insight on dynamics of<br>a reservoir, which otherwise would not be possible by<br>analyzing conventional, one-time seismic data. Analysis<br>of seismic data acquired over the same area but at<br>different periods in time helps to monitor fluid front<br>movement, assists in detecting changes in rock properties<br>caused by CO2 injection, allows optimization of the field<br>production and, therefore, improve economical effect.<br>Weyburn field experiment was carried out by the Reservoir<br>Characterization Project of the Colorado School of<br>Mines with the cooperation from the field operator, En-<br>Cana corporation.<br>The seismic acquisition program at Weyburn includes<br>three 3-D 9-C surveys with the base survey acquired in<br>2000 just before the CO2 injection program began. Two<br>additional monitoring surveys were shot in 2001 and 2002,<br>exactly one and two years later.