| US 7,542,851 B2 | ||
| Electromagnetic surveying for hydrocarbon reservoirs | ||
| Michael Tompkins, Houston, Tex. (US) | ||
| Assigned to OHM Limited, Aberdeen (United Kingdom) | ||
| Filed on Dec. 03, 2007, as Appl. No. 11/858,478. | ||
| Application 11/858478 is a continuation of application No. 11/671654, filed on Feb. 06, 2007, granted, now 7,356,412. | ||
| Application 11/671654 is a continuation of application No. 11/058529, filed on Feb. 15, 2005, granted, now 7,191,063. | ||
| Claims priority of application No. 0410129.1 (GB), filed on May 06, 2004. | ||
| Prior Publication US 2008/0068020 A1, Mar. 20, 2008 | ||
| Int. Cl. G01V 3/12 (2006.01) | ||
| U.S. Cl. 702—2 [702/7; 324/334; 324/337; 367/14] | 3 Claims |
| 1. A volume of hydrocarbon obtained from an area that contains a subterranean hydrocarbon reservoir, the hydrocarbon obtained
by:
performing an underwater controlled source electromagnetic (CSEM) survey of the area to provide electromagnetic field data
at a plurality of discrete frequencies between 0.01 Hz and 60 Hz for specific source and receiver locations;
performing a migration of the data for the source and receiver locations; and
applying an imaging condition to the migrated data at each subsurface location to produce an image parameter which represents
a desired physical property of the subsurface;
identifying the hydrocarbon reservoir from the values of the image parameter subsurface locations;
penetrating the identified hydrocarbon reservoir with a hydrocarbon-producing well; and
extracting the hydrocarbon from the reservoir using the well.
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