Method of seismically delineating the permeable extent of oil-containing formations

摘要

A first seismic survey of an exploration area is conducted thereby giving the reflection characteristics of subsurface layering followed by the introduction of gas into one or more selected formations so that the gas is caused to flow into and through the permeable portions thereof, the gas having the characteristic of increasing amplitudes of seismic signals from the formations when it is present therein. A second seismic survey of the exploration area is conducted after the introduction of gas thereinto and the first and second seismic survey results are compared to delineate the locations of gas in the formations and the permeable extent thereof.