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Processing for seismic data from slanted cable
OLR (1991) 38 (9)
G. New Patents
805
4992990
4992992
METHOD FOR DETERMINING THE POSITION OF SEISMIC STREAMERS IN A REFLECTION SEISMIC MEASURING SYSTEM
PROCESSING FOR SEISMIC DATA FROM SLANTED CABLE
Jan-£521 ge Langeland, Sheim Stein +521, Bjorn Nordmoen, Erik Vigen, Garnes, Norway assigned to Geco A S A method for determining the position of at least two seismicstreamers (S1, S2) in a reflection seismic measuring system, wherein hydroacoustic distance measurements are used which are taken by means of acoustic transceivers provided in vessels (1), buoys (8), floats (5), seismic sources (2) and in the seismic streamers (SI, S2). Absolute reference positions are determined by position determining equipment provided in at least two locations, for instance, on a vessel (l) or a float (5). The acoustic transceivers and the position determining equipment form a threedimensional structure. The position determination takes place by trilateration between the acoustic transceivers and the determination of at least two reference positions so that there is no dependency on compass bearings or optical visibility, and high redundancy is obtained. The method is particularly suited for application in connection with threedimensional marine seismicsurveys. The method may be integrated with suitable surface navigation systems in order to find the reference positions and provide absolute positions at any point within a marginal error of 5 to 10 m.
4992991 MARINE SEISMIC RECEIVING SYSTEM EMPLOYING MULTIPLE DEPTH HYDROSTREAMER CABLE Dewey R Young, Richard E Duren assigned to Exxon Production Research Company A marine seismic cable network including cables towed parallel to the surface of the sea at at least two depths for providing time analysis of reflected seismicdata to dimensionally clarify characteristics of reflecting surfaces.
William H Dragoset assigned to Western Atlas International Inc Marine seismic data is gathered using a cable towed behind a cable having a slanted orientation in the water. The recorded data is processed to remove the time offset in the recorded data of seismic signals arriving at the cable at varying plane wave angles. In a preferred embodiment of the invention, the recorded data is then processed to align the primary signals, thereby misaligning the ghost signals. The data is also processed to align the ghost signals, thereby misaligning the primary signals. The two resulting data sets may then be summed.
4992993 CORRECTION FOR VARIABLE WATER-COLUMN VELOCITY IN SEISMIC DATA Ronald Chambers assigned to Western Atlas International Inc In a marine seismic survey, a method for measuring the acoustic properties of the water mass at each seismic station along a line of survey by recovering acoustic reflections from discrete discontinuities within the water above the water-bottom reflection. A profile of the velocity distribution within the water column is calculated from a conventional velocity analysis.
4995011 ACOUSTIC MAPPING SYSTEM USING TOMOGRAPHIC RECONSTRUCTION John L Spiesberger assigned to Woods Hole Oceanographic Institute A technique for the non-intrusive position determination of one or more natural or artificial acoustic transmitters (Sl, S2, 83) in marine or terrestrial environments by processing data from
G. New Patents
805
4992990
4992992
METHOD FOR DETERMINING THE POSITION OF SEISMIC STREAMERS IN A REFLECTION SEISMIC MEASURING SYSTEM
PROCESSING FOR SEISMIC DATA FROM SLANTED CABLE
Jan-£521 ge Langeland, Sheim Stein +521, Bjorn Nordmoen, Erik Vigen, Garnes, Norway assigned to Geco A S A method for determining the position of at least two seismicstreamers (S1, S2) in a reflection seismic measuring system, wherein hydroacoustic distance measurements are used which are taken by means of acoustic transceivers provided in vessels (1), buoys (8), floats (5), seismic sources (2) and in the seismic streamers (SI, S2). Absolute reference positions are determined by position determining equipment provided in at least two locations, for instance, on a vessel (l) or a float (5). The acoustic transceivers and the position determining equipment form a threedimensional structure. The position determination takes place by trilateration between the acoustic transceivers and the determination of at least two reference positions so that there is no dependency on compass bearings or optical visibility, and high redundancy is obtained. The method is particularly suited for application in connection with threedimensional marine seismicsurveys. The method may be integrated with suitable surface navigation systems in order to find the reference positions and provide absolute positions at any point within a marginal error of 5 to 10 m.
4992991 MARINE SEISMIC RECEIVING SYSTEM EMPLOYING MULTIPLE DEPTH HYDROSTREAMER CABLE Dewey R Young, Richard E Duren assigned to Exxon Production Research Company A marine seismic cable network including cables towed parallel to the surface of the sea at at least two depths for providing time analysis of reflected seismicdata to dimensionally clarify characteristics of reflecting surfaces.
William H Dragoset assigned to Western Atlas International Inc Marine seismic data is gathered using a cable towed behind a cable having a slanted orientation in the water. The recorded data is processed to remove the time offset in the recorded data of seismic signals arriving at the cable at varying plane wave angles. In a preferred embodiment of the invention, the recorded data is then processed to align the primary signals, thereby misaligning the ghost signals. The data is also processed to align the ghost signals, thereby misaligning the primary signals. The two resulting data sets may then be summed.
4992993 CORRECTION FOR VARIABLE WATER-COLUMN VELOCITY IN SEISMIC DATA Ronald Chambers assigned to Western Atlas International Inc In a marine seismic survey, a method for measuring the acoustic properties of the water mass at each seismic station along a line of survey by recovering acoustic reflections from discrete discontinuities within the water above the water-bottom reflection. A profile of the velocity distribution within the water column is calculated from a conventional velocity analysis.
4995011 ACOUSTIC MAPPING SYSTEM USING TOMOGRAPHIC RECONSTRUCTION John L Spiesberger assigned to Woods Hole Oceanographic Institute A technique for the non-intrusive position determination of one or more natural or artificial acoustic transmitters (Sl, S2, 83) in marine or terrestrial environments by processing data from