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7672194 |
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,...
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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...
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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...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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.
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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3697938 |
SEISMIC PROSPECTING WITH RANDOM INJECTED SIGNAL
A method of seismic prospecting using an injected seismic signal which includes a series of impulses spaced in time from one another by time intervals of a random nature. The time spacing is...
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3676841 |
SEISMIC PROSPECTING WITH A CONTINUOUS SEISMIC SOURCE
A method of seismic prospecting involves making seismic records utilizing a seismic source in substantially continuous operation and motion, and in which a first signal representative of the...
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3353624 |
Minimizing multiple reflections by the application of a particular seismic wave to the earth
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3351859 |
Communication system employing multipath rejection means
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3268860 |
Correlation apparatus
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3264606 |
Method and apparatus for continuous wave seismic prospecting
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