Results from Using the CSAMT Geophysical Technique to Map Oil Recovery Processes

Abstract

ABSTRACT Use of electromagnetic geophysical prospecting techniques to map EOR processes depends upon electrical resistivity changes of the affected region. Sandia is evaluating the use of the controlled source audio-frequency magnetotelluric (CSAMT) electromagnetic geophysical prospecting technique to map steamflood and fireflood EOR processes. Results are presented of the CSAMT technique mapping of a steamflood, tar sand oil recovery experiment (depth, 500 ft) and of the mapping of a fireflood heavy oil recovery experiment (depth, 360 ft). In both experiments, contours of constant apparent resistivity for measurements taken several months apart show the movement and asymmetry of both processes. The CSAMT shows promise as a technique to map EOR processes.