41
Svein Torleif Vaage, Stig Rune Lennart Tenghamn, Claes Nicolai Borresen: System for combining signals of pressure sensors and particle motion sensors in marine seismic streamers. PGS Americas, E Eugene Thigpen, Charles R Schweppe, March 23, 2010: US07684281 (27 worldwide citation)

Signals of pressure sensors and particle motion sensors located in marine seismic streamers are combined to generate a seismic wavefield. At least a part of the particle motion sensor signal is calculated from a recorded pressure signal and the calculated at least a part of the particle motion senso ...


42
James W Rector: Method for reducing noise in drill string signals. Western Atlas International, E Eugene Thigpen, September 4, 1990: US04954998 (26 worldwide citation)

The invention is a method for improving quality of seismic data generatd with a source positioned substantially at the lower end of a drill string within a wellbore. A pilot signal is detected at the upper end of the drill string for cross-correlation with signals detected by field sensors positione ...


43
Kurt M Strack: Integrated borehole system for reservoir detection and monitoring. KJT Enterprises, E Eugene Thigpen, Richard A Fagin, December 30, 2003: US06670813 (26 worldwide citation)

A method is disclosed for generating an image of earth formations penetrated by a wellbore. The method includes generating an initial model of the earth formations using formation resistivity measured by a direct current signal. A response to the initial model of an instrument used to make the direc ...


44
Hocine Tabti, David Helmer Carlson: Method for combining pressure and motion seismic signals from streamers where sensors are not at a common depth. PGS Geophysical, E Eugene Thigpen, Richard A Fagin, November 10, 2009: US07616523 (25 worldwide citation)

A method for using signals measured by pressure responsive seismic sensors and motion responsive seismic sensors disposed in a seismic cable includes simulating a selected range frequency response of the motion responsive sensor signals for each of a plurality of selected depths in a body of water. ...


45
Matthew H Karazincir: Three-dimensional two-way acoustic wave equation pre-stack imaging systems and methods. PGS Geophysical, E Eugene Thigpen, March 27, 2007: US07196969 (25 worldwide citation)

A system and method for pre-stack imaging system that includes multiple processors, with each processor configured to perform two-way wave equation-based forward wave propagation of a source event to obtain a source wave field using high order spatial finite differences for a shot gather, and to per ...


46
William B Pramik: Seismic source and source array having depth-control and steering capability. PGS Geophysical, E Eugene Thigpen, Richard A Fagin, November 25, 2008: US07457193 (24 worldwide citation)

A marine seismic energy source includes a seismic tow cable configured to be towed by a vessel from one end and at least one seismic source coupled proximate another end of the tow cable. The at least one seismic source is associated with a depth controller. The depth controller is configured to mov ...


47
John Brittan, Joel Gordon Starr: Method for processing dual sensor seismic data to attenuate noise. PGS Exploration, E Eugene Thigpen, Richard A Fagin, May 17, 2005: US06894948 (24 worldwide citation)

A method is disclosed for processing seismic data from concurrently recorded co-located pressure sensors and geophones. The seismic data are processed by first determining an upgoing wavefield and a downgoing wavefield in the seismic data. Adaptive subtraction is then applied to at least one of the ...


48
Joseph F Mifsud: Exxon Production Research Company, E Eugene Thigpen, March 29, 1977: US04014403 (24 worldwide citation)

In a variable frequency seismic vibrator including an earth coupling plate, means for generating a reaction impedance, and an energy source for generating reciprocating movement of the coupling plate relative to the reaction impedance, the reaction impedance is generated by a reaction mass and a spr ...


49
Roger M Logan, James A Sackett: Geophone spring. Western Atlas International, E Eugene Thigpen, July 28, 1992: US05134593 (23 worldwide citation)

A spring for a seismometer for suspending one body relative to a fixed reference point within a housing including an outer ring and an inner ring interconnected by a plurality of arcuate legs. Each leg has an inner and an outer edge which may be defined by a plurality of arcs of different radii and ...


50
Stig Rune Lennart Tenghamn: PGS Geophysical, E Eugene Thigpen, Richard A Fagin, February 1, 2011: US07881158 (23 worldwide citation)

A seismic vibrator includes a transducer, a reactive mass, a base plate to couple motion of the reactive mass to subsurface formations and a linkage system configured to couple motion of the transducer to the reactive mass and the base plate. The linkage system cooperates with the reactive mass and ...