METHOD FOR IMAGING SUBTERRANEAN FORMATIONS

摘要

Disclosed is a method for imaging a subterranean formation traversed by a wellbore using a tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting response signals. In the method the tool is brought to a first position inside the wellbore, after which the transmitter is energized to propagate an electromagnetic signal into the formation. A response signal that has propagated through the formation is detected, and a derived quantity for the formation is calculated based on the detected response signal for the formation. The derived quantity for the formation is plotted against time. The tool is moved to at least one other position within the wellbore and the procedure above is repeated. Then an image of the formation within the subterranean formation is created based on the plots resulting from the repeated procedure above.