Cost effective application of 3D before stack depth migration (BSDM) in the Lobo gas fields of south Texas has resulted in increased confidence in reservoir structure maps. Successful infill development locations have been drilled as a result of improved reconciliation of existing production with fault block area. The improved image has also led to the identification of new fault blocks and improved well locations. The case history of one area will illustrate how the program has generated value of over 40 times the initial investment in seismic processing. To date, nine depth migration projects have been completed.