Cross-well continuity logging using guided seismic waves

Cross-well seismic recording with sources and receivers in different wells can potentially image the internal structure of reservoirs with resolution on the order of a few feet. Transmission and reflection images can be made, but both have inherent limitations. The well separation is generally limited by the source strength to less than 2000 ft, and coplanar wells are desired. Also, adequate imaging requires a large number of source and receiver locations, resulting in expensive acquisition costs. Removal of production tubing from both wells is often necessary, adding even more to the cost. Given these limitations, imaging methods are generally restricted to densely drilled mature fields where budgets for data acquisition are limited.