VSP techniques provide information in the vicinity of the borehole. VSP is a class of seismic measurements that can obtain high resolution images near the wellbore (Hardage, 2000). VSP acquisition utilizes sensors deployed within a borehole and sources located at the surface, whereas crosswell tomography uses sources and receivers both deployed in boreholes. The advantage of VSP, crosswell seismic, and other high resolution methods is to obtain more precise estimations of the CO2 induced effects on seismic properties. Results from high resolution testing can be used as a calibration for lower resolution surface seismic. A potential advantage of these borehole methods, relative to surface seismic methods, is higher vertical resolution imaging. This approach has been deployed.
