Time-Lapse Borehole Seismic Study in Vacuum Field, New Mexico – Velocity and Q Factor Changes Due to Co2 Injection within a Carbonate Reservoir

A-20 TIME-LAPSE BOREHOLE SEISMIC STUDY IN VACUUM FIELD NEW MEXICO – VELOCITY AND Q FACTOR CHANGES DUE TO CO2 INJECTION WITHIN A CARBONATE RESERVOIR GWÉNOLA MICHAUD¹² ¹Colorado School of Mines 1500 Illinios Street Golden CO 80401 USA ²Compagnie Generale de Geophysique Abstract 1 The Reservoir Characterization Project of the Colorado School of Mines has recorded two multicomponent borehole seismic surveys at Vacuum Field New Mexico. These two surveys were recorded in December 1997 and 1998 before and after eight months of CO2 injection. Each borehole dataset is composed of a near-offset VSP and a 3D VSP. The purpose of these