Waterflooding of the Rangely Oil Field of Colorado started in December 1957 in an effort to recover the maximum amount of oil from the reservoir. After 10 years of waterflooding, fluid production still exceeds fluid injection. As of October 1967 the deficit was 92 million barrels of fluid.
A seismic study using seismograms from the Uinta Basin Seismological Observatory near Vernal, Utah, was made of the Rangely area. The epicenters of the earthquakes centered on the reservoir and extended beyond its limits. No prominent secondary area of activity was found.
A study of the net fluid injected into the reservoir and the number of earthquakes that occurred disclosed no positive time correlation between these two parameters.
Figures & Tables
Prepared by the Case Histories Committee for the Engineering Geology Division of the Geological Society of America, these histories are intended as reference material for the practicing geologist and for the college student. This volume, the eighth in the Case History series, presents the seismological aspects of the works of man—the civil engineer or engineering geologist interacting with the environment. Topics are in two categories—changes at a point (nuclear or chemical explosions and well injection or withdrawal) and changes on a line (damming a river or construction along a coastline).