Abstract: A hydrocarbon reservoir undergoing secondary recovery is subject to a first and then at least a second gravity gradient survey in which a gravity gradiometer takes gradient measurements on the surface above the reservoir to define successive data sets. The differences between the first and subsequent gravity gradient survey yields information as to sub-surface density changes consequent to displacement of the hydrocarbon and the replacement thereof by the driveout fluid including the position, morphology, and velocity of the interface between the hydrocarbon to be recovered and the driveout fluid.
Type:
Grant
Filed:
May 11, 1999
Date of Patent:
November 28, 2000
Assignee:
Lockheed Martin Corporation
Inventors:
Manik Talwani, Walter K Feldman, Melvin Schweitzer