Patent ID: 6393363
Filing Date: 2002-05-21
Classification: G01V

Abstract:
A method for measuring characteristics of a geologic formation, said method comprising:producing, within a first area or said geologic formation, a first magnetic field; sensing, within a second area of said geologic formation, a second magnetic field, with said second area being spaced-apart from said first area, with said first and second magnetic field being produced with one of said first and second areas being surrounded with an electrically conductive liner, said liner having an attenuation factor associated therewith; forming a signal corresponding to said second magnetic field, said signal including information corresponding to said attenuation factor; calculating a modeled magnetic field corresponding to said second magnetic field in an absence of said electrically conductive liner, defining a modeled representation; obtaining a quantitative value of said attenuation factor by dividing said signal by said modeled representation, removing said information from said signal by dividing said signal with said quantitative value, defining a corrected signal; and measuring said characteristics as a function of said corrected signal.