The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 30, 2012
Filed:
May. 16, 2007
Brian Anthony Farrelly, Rådal, NO;
Svein Erling Johnstad, Bønes, NO;
Brian Anthony Farrelly, Rådal, NO;
Svein Erling Johnstad, Bønes, NO;
Norsk Hydro ASA, Oslo, NO;
Abstract
A method for electromagnetic geophysical surveying of rock formations () under a sea-floor () comprising the following steps: *—towing first and second alternating field (E, E) emitting sources (s, S) in first and second depths below the sea surface, said first field (E) having a first phase (Φ);—said second alternating field (E) given a second phase (Φ) different from said first phase (Φ), said sources (S, S) constituting a phased array emitter antenna with directivity for transmitting a major proportion of the combined electromagnetic energy downwards;—said first and second fields (E, E) for propagating partly down through the sea-floor () and being reflected and/or refracted through said rock formations () and partly propagating back through the seafloor ();—said first and said second fields (E, E) for merging to a total field and being measured by electromagnetic receivers (r, r, . . . , r) recording corresponding field registrations (E(t), E(t), E(t), . . . , E(t)).