| 摘要 |
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 comprises 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, e.g. providing conventional controlled-source electromagnetic survey data. A subset of the field data is identified that comprises data obtained for source-receiver separations greater than a selected threshold offset. The threshold offset is chosen so that data beyond this offset are characteristic of magnetotelluric data. The subset of data is then processed in accordance with a first technique to obtain information on the background strata configuration. Other field data obtained for source-receiver separations less than the threshold offset is then processed in accordance with a second technique to obtain information on any subterranean resistive or conductive body within the background strata configuration. |
