Surveying using vertical electromagnetic sources that are towed along with survey receivers
AssigneeWesternGeco L.L.C.
InventorsDavid L. Alumbaugh, Andrea Zerilli, H. Frank Morrison, Martin Howlid, James P. Brady, Leendert Combee, Edward Nichols, Nestor Cuevas
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Abstract
A system to perform a marine subterranean survey includes at least one vertical electromagnetic (EM) source and at least one EM receiver to measure a response of a subterranean structure that is responsive to EM signals produced by the vertical EM source. At least one tow cable is used to tow the EM source and EM receiver through a body of water.
Claims19
A system for performing a marine subterranean survey, comprising:
- at least one vertical electromagnetic (EM) source, wherein the vertical EM source includes a first horizontal EM source and a second horizontal EM source, the first and second EM sources having opposing moments;
- at least one EM receiver to measure a response of a subterranean structure that is responsive to EM signals produced by the vertical EM source;
- and
- at least one tow cable to tow the at least one vertical EM source and the at least one EM receiver through a body of water.
An apparatus for performing a marine subterranean survey, comprising:
- at least one vertical electromagnetic (EM) source to be towed through a body of water, wherein the vertical EM source includes a first horizontal EM source and a second horizontal EM source, the first and second EM sources having opposing moments;
- and
- at least one EM receiver to be towed through the body of water, wherein the at least one EM receiver is to measure EM fields affected by a subterranean structure in response to EM signals generated by the at least one EM source.
A method of performing a marine subterranean survey, comprising:
- towing at least one vertical electromagnetic (EM) source through a body of water, wherein the vertical EM source includes a first horizontal EM source and a second horizontal EM source, the first and second EM sources having opposing moments;
- towing at least one EM receiver through the body of water;
- and
- measuring EM fields affected by a subterranean structure in response to EM signals produced by the at least one vertical EM source.
Dependencies are inferred from the claim text.