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| Number | Title | Issue Date |
| 7376046 | Method of seismic surveying The present invention provides a seismic surveying method in which vibrators in a first vibrator group are actuated at time T0 and vibrators in a second vibrator group are actuated at time T1, where T0 | 05/20/2008 |
| 7330401 | Seismic vibratory acquisition method and apparatus A method and related apparatus are described for generating acoustic signals for use in a vibratory seismic survey, including the step of combining into a drive signal a high frequency sweep signal, which sweeps upwardly through a high frequency band during a first ... | 02/12/2008 |
| 7260021 | Method of harmonic noise attenuation in correlated sweep data The present invention provides a method for harmonic noise attenuation in correlated sweep data in seismic exploration. The method includes forming a plurality of correlation data subsets using a plurality of sweep data sets and a correlation reference sequence. The... | 08/21/2007 |
| 7050356 | Method of seismic surveying A method of seismic surveying comprising the steps of actuating the or each vibrator in a first vibrator group at time T0, and subsequently actuating the or each vibrator in a second vibrator group at time T1 that satisfies T0 | 05/23/2006 |
| 6934219 | Methods and systems for acquiring seismic data Methods and systems are provided for acquiring seismic data. Data are collected representing acoustic signals received from the Earth at distinct geographic locations. Data representing an ambient signal at the distinct geographic locations are also collected. For e... | 08/23/2005 |
| 6766368 | System and method for providing an internet-based correlation service A method and system are disclosed for efficiently correlating events within a data processing system and then transmitting messages to various network entities in response to an occurrence of a particular network event. According to the present invention, a network ... | 07/20/2004 |
| 6704245 | Seismic prospecting method and device using simultaneous emission of seismic signals obtained by coding a signal by pseudo-random sequences Seismic prospecting method and device using simultaneous emission of seismic signals obtained by coding a signal by pseudo-random sequences, and notably a periodic signal phase modulated by such sequences. Signals such as, for example, periodic signals phase m... | 03/09/2004 |
| 6681199 | Peak time detecting apparatus and method A product-sum operation portion for performing a product-sum operation (wavelet transformation) with respect to an input time-series signal by using as a base of integral a complex function in which the imaginary number portion is π/2 shifted in phase fr... | 01/20/2004 |
| 6631783 | Mapping reservoir characteristics using earth's nonlinearity as a seismic attribute This invention relates to mapping the hydrocarbon reservoir characteristics by mapping the reservoir formations that display dynamic elastic nonlinearity responses to the seismic signals. The main reason of this nonlinear behavior in the reservoir rocks i... | 10/14/2003 |
| 6302204 | Method of obtaining improved geophysical information about earth formations The present invention provides a method for forming wellbores. In one method, one or more wellbores are drilled along preplanned paths based in part upon seismic surveys performed from the surface. An acoustic transmitter conveyed in such wellbores transm... | 10/16/2001 |
| 6289284 | Method of imaging the permeability and fluid content structure within sediment A non-destructive method of measuring physical characteristics of a medium, such as uncemented sediment, sandstone, or limestone. A pseudo-random code is generated and is used to generate a pseudo-random acoustic signal. This signal is transmitted into th... | 09/11/2001 |
| 6061300 | Method of imaging the permeability and fluid content structure within sediment A non-destructive method of measuring physical characteristics of a medium, such as uncemented sediment, sandstone, or limestone. A pseudo-random code is generated and is used to generate a pseudo-random acoustic signal. This signal is transmitted into th... | 05/09/2000 |
| 5999487 | Seismic reflection data acquisition and processing method and device for prospecting in tectonically complex environments A seismic reflection data acquisition and processing method and device for prospecting in tectonically complex environments are disclosed. In particular, the seismic reflection data acquisition and processing method is useful for providing a summation rat... | 12/07/1999 |
| 5991236 | Method of measuring buried objects, geological formations and sediment properties An apparatus and method are provided for detecting buries objects, geological formations or sediment properties by transmitting an acoustic signal and receiving a scattered signal. An acoustic source and an array of receivers are used to correlate the sca... | 11/23/1999 |
| 5406530 | Pseudo-random binary sequence measurement method A non-destructive method of measuring physical characteristics of sediments to obtain a cross-sectional distribution of porosity and permeability values and variations, and of shear modulus and shear strength. A pair of boreholes have borehole entries spa... | 04/11/1995 |
| 5241513 | Correlation system for nonlinear vibratory signals Seismic data is cross correlated with a correlation reference which is an amplitude modified version of a nonlinear sweep. The amplitude modification provides both deboost and tapering.... | 08/31/1993 |
| 5226018 | Geophysical prospecting method using pseudo-random pulse sequences A geophysical prospecting method comprises injecting signal energy in the form of at least two pseudo-random pulse sequences of the complementary sequence type into an underground formation. Next, the signal energy is detected after it has been attenuated... | 07/06/1993 |
| 5010526 | Method of digital filtering An improved method for filtering noise bands from seismic data is described. The data is analyzed to determine the frequency component of the undesired noise, and a precise autocorrelation function is generated and used to design a filter to remove the un... | 04/23/1991 |
| 4899321 | Method and apparatus for determining the source signature of land vibrators Methods and apparatus for processing vibrative seismic data. Baseplate phaselock vibrative energy, reaction mass phaselock vibrative energy and ground force phaselock vibrative energy are transmitted into the earth using a land vibrator and the reflection... | 02/06/1990 |
| 4853903 | Method and apparatus for removing sinusoidal noise from seismic data Method and apparatus for removing sinusoidal noise from seismic traces comprised of a seismic data component and a sinusoidal noise component. Seismic traces acquired by conventional seismic exploration of a subsurface formation are utilized to produce a ... | 08/01/1989 |
| 4780856 | Off-shore seismic prospection method using a coded vibratory signal and a device for implementing this method An offshore reflection seismic prospection method is provided including a vibratory signal coded in accordance with a pseudo-random code. Correlation of the signals received by the seismic sensors by means of the cycle of the coded signal transmitted allows se... | 10/25/1988 |
| 4768174 | Method for generating and collecting random vibratory seismic data wherein a pre-specified wavelet of minimum side lobe content is always produced in the final correlations by maintaining domain consistency A method of producing random sweeps for seismic vibrator sources is described which produces correlograms with reduced side lobe contamination. Digital random phase digital codes activate non-impulsive sources. Detected signals are processed using periodi... | 08/30/1988 |
| 4729066 | Method and apparatus for the generation and transmission of signals for echo location and other signaling purposes, particularly in geophysical exploration A transmission which requires only a single source to transmit is generated in accordance with a code which is binary (a pulse train having two levels which produces a specific harmonic line spectrum). The pulses are generated by pulse time modulation of ... | 03/01/1988 |
| 4675851 | Method for seismic exploration Sweeps of seismic signals consisting of pulse trains having a predetermined number of pulses in which the periods or durations of the pulses are randomized and in which the wave shape and relative time displacements of the pulses in different trains provi... | 06/23/1987 |
| 4607353 | Seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes to simulate an impulsive, causal generating, recording and pre-processing system and processing the results into distortion-free final records The disclosed invention is a method of seismic exploration using non-impulsive vibratory sources activated by filtered stationary, Gaussian codes. The method adds a distortion-free quality to the full-waveform seismic records.... | 08/19/1986 |
| 4601022 | Seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes, and processing the results in distortion-free final records particularly useful in urban areas The disclosed invention is a method of seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes in urban areas. The method adds a distortion-free quality to the full-waveform seismic records.... | 07/15/1986 |
| 4598391 | Seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes, detecting vibrations via receivers within a wellbore and processing the results into distortion-free final records The disclosed invention is a method of seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes in a wellbore environment. The method adds a distortion-free quality to the full-waveform seismic records.... | 07/01/1986 |
| 4549285 | Apparatus for real time correlation in seismic prospection The invention provides an apparatus for seismic prospecting which is to effect a correlation in real time between a pilot signal and a picked-up seismic signal. With N being the number of samples corresponding to the desired thoroughness of investigation,... | 10/22/1985 |
| 4545039 | Methods for seismic exploration Sweeps of seismic signals consisting of pulse trains having a predetermined number of pulses in which the periods or durations of the pulses are randomized and in which the wave shape and relative time displacements of the pulses in different trains provi... | 10/01/1985 |
| 4543632 | Robust estimation method for determining when subsequent data processing can include sign-bit representations of full-waveform seismic traces A method is disclosed for determining if sign-clipped variations of full-waveform traces can be used in subsequent cross-correlation processing without undue hardship. In accordance with one aspect, the present invention examines skewness of the amplitude... | 09/24/1985 |
| 4486866 | Seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes, and processing that results in distortion-free final records particularly useful in stratigraphic trap determination The disclosed invention is a method of seismic exploration using non-impulsive vibratory sources activated by stationary, Gaussian codes. The method has the channel-capacity economy of sign-bit recording and the distortion-free quality of full-waveform se... | 12/04/1984 |
| 4390973 | Method for determining the extent of subsurface reaction involving acoustic signals A method determines the extent of subsurface reactions in which random acoustic signals are radiated from a whole area covered by the reaction or from a boundary region, hereafter termed reaction front, between largely undisturbed rocks and those already ... | 06/28/1983 |
| 4346461 | Seismic exploration using vibratory sources, sign-bit recording, and processing that maximizes the obtained subsurface information The disclosed invention is a method of seismic exploration using vibratory sources activated by stationary, Gaussian codes. The method has the channel-capacity economy of sign-bit recording, at both the sources and receivers, without the sacrifice of any ... | 08/24/1982 |
| 4204278 | Methods and apparatus for the generation and transmission of signals for echo location and other signalling purposes, as in geophysical exploration Quasi periodic pulse trains are generated and swept in repetition frequency over an octave. Spectral harmonics of the pulse trains which prevent the trains from having a constant or "flat" power spectrum over a frequency range much greater than an octave ... | 05/20/1980 |
| 4136326 | Apparatus for obtaining seismic data Apparatus for obtaining seismic data or information in the field comprises electrical communication paths established between seismic detectors distributed over the ground, and a digital seismic data recorder. Each of the paths comprises a pre-amplifier, ... | 01/23/1979 |
| 4049077 | Seismic vibrator control system This invention is a control system for a hydraulic vibrator that permits the injection into the ground of seismic signals having pseudo-random code patterns or other broad band signals. Feedback for controlling vibrator operation is taken from the couplin... | 09/20/1977 |
| 4044356 | Process and device for correlation for use in a doppler radar installation In a double correlation device incorporated in a radar installation for muring distance, the transmitted high-frequency signal is modulated, by frequency displacement, by a series of pseudo-random pulses. The first correlation is carried out between each... | 08/23/1977 |
| 4011924 | Device for producing mechanical waves A device for generating sound waves for use in shallow terristrial seismology incorporates a percussion mass, a motor for driving the percussion mass to strike the ground for intermittent contact and adjustable to vary the frequency of impact, and a sensi... | 03/15/1977 |
| 3968471 | Method for suppressing side lobes in correlation processes This invention relates to an improved method of seismograph exploration by means of time-variant oscillatory signals whereby the side lobes of the correlograms (or of the output waveforms) are randomized to prevent constructive reinforcement during vertic... | 07/06/1976 |
