Inventors:
Tsili Wang - Katy TX, US
Daniel Georgi - Houston TX, US
Michael Phillips - Tallahassee FL, US
Eduard Van Wijk - Mauroux, FR
Christian Fulda - Sehnde, DE
Assignee:
Baker Hughes Incorporated - Houston TX
International Classification:
G01V 1/00
Abstract:
A resistivity logging tool suitable for downhole use includes a transmitter and two spaced apart receivers. The measured signals are inverted to determine the distance to an overpressured zone in the earth formation. The overpressured zone may be a transition zone in resistivity. The direction of drilling may be controlled based on the determined distance. Optionally, seismic-while drilling measurements may be made from which a separate estimate of the distance can be obtained. The SWD® measurements may also be processed to estimate the pore pressure.