G - Physics – 01 – V
Patent
G - Physics
01
V
341/106, 349/9
G01V 1/38 (2006.01)
Patent
CA 1089075
ABSTRACT OF THE DISCLOSURE Methods for maintaining a steerable paravane supported seismic energy source, as an air gun, positioned laterally at a precise constant predetermined distance from a geophone mounted on a submerged geophone streamer cable while recording offshore marine seismic reflection data from a seismic tow system including electrical controls on a recording boat for towing the paravane and geophone streamer cable are disclosed. Two modifications of an offshore maring seismic energy source tow system are also disclosed. Both systems com- prise transmitters and receivers therein for continuously measuring the distance between a vessel towed submerged geophone streamer cable and a towed seismic air gun support- ing paravane on each side of the streamer cable for generating and transmitting corrective steering signals to the paravane for maintaining each seismic air gun spaced from the towed submerged geophones at an exact predetermined distance for producing more accurate seismic velocity measurements. One embodiment has the acoustic transmitter on the geophone streamer cable and an accoustic receiver on each paravane in line with the transmitter, and a second embodiment has an acoustic transmitter on each paravane and a corresponding accoustic receiver for each paravane on the geophone streamer cable transversely of the transmitter. Methods for assem- bling the above two systems are disclosed.
291246
Itria Oswald A.
Todd James D.
Smart & Biggar
Texaco Development Corporation
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