Seismic tomography is a rapidly developing technology which is attracting considerable interest in the petroleum industry. lts primary use at this time is in reservoir imaging applications, including EOR monitoring. As a result, this multifaceted and interdisciplinary technology is beginning to play an important role in improved oil recovery. New developments in seismic tomography promise to solve or contribute to the solution of many problems associated with reservoir management. When used properly, seismic tomography may enable us to improve the efficiency of our programmes, cut our ultimate costs and increase our recoverable reserves.