Patent Number: 7,826,972

Title: Methods of electromagnetic logging using a current focusing receiver

Abstract: A method for determining a formation electrical property under a sea floor includes obtaining measurement data using a receiver having an impedance lower than an impedance of seawater at a measurement site; correcting the measurement data to obtain corrected data corresponding to data that would have been acquired using a receiver having an impedance matched with the impedance of the seawater; and deriving the formation property from the corrected data.

Inventors: Babour; Kamal (Bures sur Yvette, FR), Besson; Christian (Le Pecq, FR), Safinya; Kambiz (Garches, FR), Heelan; Philip (Co. Clare, IR), Nichols; Edward (Berkeley, CA)

Assignee: WesternGeco L.L.C

International Classification: G01V 3/26 (20060101)

Expiration Date: 2019-11-02 0:00:00