A combined reversed vertical seismic profile (RVSP), crosshole, and surface seismic experiment was performed to image the subsurface between two 1000 ft wells separated by 600 ft. RVSP data, consisting of 48 offsets ranging from 25 ft to 1200 ft, were processed with a ray-tracing method to produce an equivalent stacked seismic section. The crosshole data were processed with an SIRT traveltime transmission tomography algorithm to produce a velocity cross-section. The stacked RVSP subsurface image and the crosshole tomography velocity cross-section both have higher resolution than does the surface seismic image. However, all three methods agree within the limits of their common resolution. The results indicate that RVSP and crosshole tomography can potentially be used to image steeply dipping beds or complex structures. -from Authors
