公开(公告)号：US10132953B2

公开(公告)日：2018-11-20

申请号：US15248750

申请日：2016-08-26

Applicant: BAKER HUGHES INCORPORATED

Inventor： Andreas Hartmann ,  Sheng Fang

IPC: G01V3/20

Abstract: Methods and apparatus for determining at least one parameter of interest of an earth formation. Methods include using at least one transmitter to initiate at a single location in the formation a first electromagnetic signal at a first frequency and a second electromagnetic signal at a second frequency different than the first frequency for propagation through the formation; receiving the first electromagnetic signal propagating through the formation and the second electromagnetic signal propagating through the formation at a single receiver non-collocated with the at least one transmitter; estimating a relative phase shift of the second electromagnetic signal relative to the first electromagnetic signal; estimating a relative attenuation of the second electromagnetic signal relative to the first electromagnetic signal; using the relative attenuation and the relative phase shift to estimate a parameter of interest of the formation. The receiver may be unsynchronized with respect to the transmitter.