METHOD FOR ELECTROMAGNETIC GEOPHYSICAL SURVEYING OF SUBSEA ROCK FORMATIONS

METHOD FOR ELECTROMAGNETIC GEOPHYSICAL SURVEYING OF SUBSEA ROCK FORMATIONS

A method for electromagnetic geophysical surveying of rock formations (1) under a sea-floor (3) comprising the following steps: *-towing first and second alternating field (E1, E2) emitting sources (s1, S2) in first and second depths below the sea surface, said first field (E1) having a first phase...

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Hauptverfasser: JOHNSTAD, SVEIN, ERLING, FARRELLY, BRIAN, ANTHONY
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
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creator JOHNSTAD, SVEIN, ERLING
FARRELLY, BRIAN, ANTHONY
description A method for electromagnetic geophysical surveying of rock formations (1) under a sea-floor (3) comprising the following steps: *-towing first and second alternating field (E1, E2) emitting sources (s1, S2) in first and second depths below the sea surface, said first field (E1) having a first phase (Φ1);-said second alternating field (E2) given a second phase (Φ2) different from said first phase (Φ1), said sources (S1, S2) constituting a phased array emitter antenna with directivity for transmitting a major proportion of the combined electromagnetic energy downwards;-said first and second fields (E1, E2) for propagating partly down through the sea-floor (3) and being reflected and/or refracted through said rock formations (1) and partly propagating back through the seafloor (3);-said first and said second fields (E1, E2) for merging to a total field and being measured by electromagnetic receivers (r1, r2, . . . , rn) recording corresponding field registrations (Er1(t), Er2(t), Er3(t), . . . , Ern(t)).
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subjects DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
title METHOD FOR ELECTROMAGNETIC GEOPHYSICAL SURVEYING OF SUBSEA ROCK FORMATIONS
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