Patent ID: 7565245
Filing Date: 2009-07-21
Classification: E21B,G01V

Abstract:
1. A method of analysing results from an electromagnetic survey of an area that is thought or known to contain a subterranean resistive or conductive body within a background strata configuration, comprising: providing a set of electromagnetic field data obtained using at least one electromagnetic receiver and at least one electromagnetic source for a range of source-receiver separations; identifying a subset of the electromagnetic field data which comprises data obtained for source-receiver separations greater than a threshold offset; processing the subset of the electromagnetic field data for source-receiver separations greater than the threshold offset in accordance with a first technique to obtain information on the background strata configuration; and processing electromagnetic field data obtained for source-receiver separations less than the threshold offset in accordance with a second technique to obtain information on any subterranean resistive or conductive body within the background strata configuration.