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| Number | Title | Issue Date |
| 7835224 | Reconstructing low frequency data recordings using a spread of shallow and deep streamers A technique includes obtaining first data indicative of seismic measurements acquired by seismic sensors of a first set of towed streamers and obtaining second data indicative of seismic measurements acquired by seismic sensors of a second set of towed streamers. Th... | 11/16/2010 |
| 7248052 | Electric power grid induced geophysical prospecting method and apparatus A geophysical prospecting method and apparatus that utilizes the harmonics and sub harmonics waves induced into the earth by the electric power grid. The amplitude-frequency data are converted to amplitude-depth data and further converted to a differential curve. Th... | 07/24/2007 |
| 7227362 | Electric power grid induced geophysical prospecting method and apparatus An underground prospecting method and apparatus that utilizes the harmonics and fractional harmonic waves induced into the earth by the electric power grid. The data are converted to amplitude-depth and phase-depth data. The resulting data may be plotted and are com... | 06/05/2007 |
| 7068568 | Method of processing seismic data A method of de-ghosting seismic data acquired in a marine seismic survey comprises estimating ∂zp (where p is the fluid pressure) from a time-derivative of p and a derivative of p in a horizontal direction such as the x-direction. The time-derivative of... | 06/27/2006 |
| 7031223 | Method for correcting seismic data for receiver movement during data acquisition A method is disclosed for processing seismic data. The method includes determining a position of a seismic energy source and seismic receivers at a time of actuation of the source. A velocity of the seismic receivers with respect to the source position is determined... | 04/18/2006 |
| 7026826 | Vector sensor device and calibration method A sensor includes a piezoelectric hydrophone and at least one accelerometer. In calibration mode, the hydrophone is connected to a source of a known electrical signal and outputs a mechanical/acoustic signal that the accelerometer detects. Comparison of the known el... | 04/11/2006 |
| 6918299 | Method and apparatus for improving performance of a force balance accelerometer based on a single-coil velocity geophone The invention concerns methods and apparatus for improving the performance of a force-balance accelerometer based upon a conventional, single-coil, velocity geophone. Specifically, the operating temperature range is increased through the use of both a temperature-co... | 07/19/2005 |
| 6906754 | Electronic display with compensation for shaking A display device includes a display screen, and horizontal and vertical display signals. The horizontal and vertical display signals are to render an image on the display screen. A first and second accelerometers are directly coupled to the display screen. First and... | 06/14/2005 |
| 6891776 | Vibrator sweep shaping method This invention relates to improved methods to generate shaped sweeps, and for the acquisition of vibroseis data with a shaped pilot sweep. ... | 05/10/2005 |
| 6678207 | Trapped water bottom multiple and peg-leg multiple suppression for ocean bottom seismic data The invention is a method for removing trapped water bottom multiples, receiver side peg-leg multiples, and source side peg-leg multiples from dual sensor OBC data, where the data includes both pressure signals and velocity signals. The pressure and veloc... | 01/13/2004 |
| 6246637 | Method and system for combining three component seismic data A system and method of processing seismic signals wherein seismic data resulting from a reflected seismic wave is received at a multi-component receiver. A mask trace is generated as a function of the seismic data received at the multi-component receiver,... | 06/12/2001 |
| 6021090 | Horizontal and vertical receiver-consistent deconvolution for an ocean bottom cable The objective of this invention is to provide a method for estimating, in the frequency domain, deconvolution operators for removing spurious resonant coupling responses from the cross-line and the vertical seismic signal components in OBC surveys. The pu... | 02/01/2000 |
| 5991238 | Weighted backus filter method of combining dual sensor traces A method for attenuating water column reverberations in a dual sensor seismic signal, whereby a pressure signal and a velocity signal are transformed from the time domain to the frequency domain, generating a transformed pressure signal and a transformed ... | 11/23/1999 |
| 5696734 | Method and system for eliminating ghost reflections from ocean bottom cable seismic survey signals A computer system and method for eliminating the effects of ghost reflections from marine seismic survey traces obtained via ocean bottom cables are disclosed. Dual sensors are used in the ocean bottom cables, to obtain both pressure and velocity traces. ... | 12/09/1997 |
| 5621700 | Method for attenuation of reverberations using a pressure-velocity bottom cable A method is described that attenuates reverberations in ocean bottom cable data used to generate a seismic profile. First, a seismic wave is generated and recorded by pressure and particle velocity sensor pairs. Adding the product of the pressure data tim... | 04/15/1997 |
| 5621699 | Apparatus and method of calibrating vertical particle velocity detector and pressure detector in a sea-floor cable with in-situ passive monitoring A method of processing data from a co-located hydrophone-geophone pair of seismic receivers of an ocean-bottom cable system. Ambient noise is obtained for the hydrophone and geophone. A relative noise signal is determined by finding the normalized differe... | 04/15/1997 |
| 5528555 | System and method for compensating for towed array motion induced errors A system for compensating for noise induced in a sensor data stream from a sensor array towed by a towing device includes a towing device motion data input receives a towed motion data stream representative of towing motion of the towing device. A sensor ... | 06/18/1996 |
| 5511008 | Process and apparatus for extracting a useful signal having a finite spatial extension at all times and which is variable with time A process for the extraction of a time-variable useful signal having a finite spatial extension by an array of N sensors or transducers (N being equal to or greater than 3), that receive the useful signal to which have been added q spatially coherent addi... | 04/23/1996 |
| 5442591 | Method for adaptively suppressing noise transients in summed co-sensor seismic recordings Seismic data from co-located sensors of different genera are formatted into common velocity-receiver gathers and common pressure receiver gathers. A first ratio between the velocity signature amplitudes and the pressure signature amplitudes is measured wi... | 08/15/1995 |
| 5148406 | Method for simultaneous collection of seismic data from shallow and deep targets A method for simultaneous collection of seismic data of shallow and deep targets, in which two seismic streamers are towed at different water depths (1 and 2 in FIG. 2), and only one acoustic source of seismic signals is used. The seismic data recorded by... | 09/15/1992 |
| 5030913 | Multiple sensor magnetometer with temporal noise rejection and controllable spatial response on a moving platform A mobile magnetometry processing system which scans an area in order to mure the magnetic field strength over the area, comprising: a plurality of N sensors for sensing the magnetic field of the area being scanned, each sensor generating an output signal, for... | 07/09/1991 |
| 4918668 | Marine vibrator tuneable array A method of reducing horizontally propagating pressure waves in marine seismic exploration improves the signal-to-noise ratio at associated receivers and reduces interference at unassociated receivers. Marine vibrators are arranged into an array with a gi... | 04/17/1990 |
| 4751687 | Methods of reducing harmonic distortion in continuous wave seismic exploration Described is a method of driving a seismic vibrator with a control signal to produce an output signal having minimized harmonic distortion. The method includes the steps of producing a plurality a harmonic distortion signals related to a fundamental frequ... | 06/14/1988 |
| 4744064 | Method and apparatus for seismic exploration Method and apparatus for digitally deriving arrays from seismic data. Indentical parallel processing elements connected between common input/output buses are each preselected to derive different pluralities of arrays. Array specifications defining the arr... | 05/10/1988 |
| 4538251 | Marine seismic streamer cable for providing selectable detector array connections A marine seismic cable comprising a plurality of universal sections, each section including a plurality of fundamental arrays, preferably positioned end-to-end. Each of the arrays are separately wired to a logic circuit in one of the connectors or cans be... | 08/27/1985 |
| 4509149 | Directional long array for logging vertical boundaries A logging sonde has directivity control of multiple sources and receivers in linear arrays. Each of the sources produces acoustic pulses which are delayed by a time delay between the sources to direct acoustic energy at an angle such that the resulting ac... | 04/02/1985 |
| 4276620 | Method and apparatus for obtaining a composite field response _to a variable source array using weighting coefficients A multi-channeled digital seismic field stacking system is disclosed for obtaining the composite response to a variable source array. A variable source array is synthesized by applying preselected weighting coefficients to the seismic signals produced in ... | 06/30/1981 |
| 4254480 | Frequency independent directionally sensitive array in seismic surveying A novel array of vertically and horizontally spaced hydrophones is shown which is capable of high ratio of desired signal to noise because of good directional sensitivity when used with any seismic source. Alternatively, a novel directionally sensitive ar... | 03/03/1981 |
| 4253164 | Multi-purpose seismic transducer A multi-purpose seismic transducer includes a first seismic sensor having a first transfer function. A transfer-function shaping filter is coupled to the output of the first seismic sensor. The filter is adjustable to shape the first transfer function to ... | 02/24/1981 |
| 4011539 | Seismic detector arrays A new and improved seismic survey cable, and method of seismic exploration with such a cable is disclosed. The system has detectors or hydrophones spaced in the cable so as to achieve a detector density conforming to a Gaussian frequency distribution with... | 03/08/1977 |
| 3939468 | Differential charge amplifier for marine seismic applications A differential charge amplifier for use in towed marine seismic streamers and the like involving towed hydrophone arrays wherein the hydrophone outputs are conducted by long twisted pairs of leads to signal processing equipment, the differential charge am... | 02/17/1976 |
