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8982668 Semiconductor device and method of forming same for correlation detection  
In an embodiment a semiconductor device correlates a received signal with a known pattern. A correlation output is used as a basis for forming a confidence reference level. The confidence...
8982665 Dithered slip sweep vibroseis acquisition system and technique  
A technique includes generating vibroseis sweeps for a vibroseis survey to produce seismic data acquired in response to seismic signals produced by the sweeps. The generation of the vibroseis...
8958267 Seismic true estimated wavelet  
The invention relates to processing seismic data that includes signals from at least two sources and typically three or four sources where source separation is necessary for geophysical analysis....
8792300 Low-frequency content boost for vibratory seismic source and method  
Computer software, computer and method for generating with a computing device a desired pilot signal for driving a vibratory source to generate seismic waves. The method includes steps for...
8773950 Method and seismic sources with high productivity  
A method for seismic prospecting that includes a step of deploying plural vibratory sources on the ground; a step of receiving at each vibratory source a corresponding pilot signal for driving the...
8675447 Device and method for de-blending simultaneous shooting data  
A device, medium and method for de-blending seismic data associated with a subsurface of the earth. The method includes a step of receiving seismic data “d” recorded with one or more land...
8189426 Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture  
Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture are described. According to one embodiment, an earth analysis method includes...
8027223 Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture  
Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture are described. According to one embodiment, an earth analysis method includes...
7869304 Method and apparatus for pre-inversion noise attenuation of seismic data  
A method and apparatus for pre-inversion noise attenuation of seismic data. The method can generally comprise: (a) acquiring seismic data including receiver data corresponding to vibratory signals...
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,...
7656748 Method of determining impulse responses from a medium in relation to the transmission of waves between different points  
The invention relates to a method of determining impulse responses from a medium (2) in relation to the transmission of waves between different points (T1-TN). The inventive method consists in:...
7627433 Phase control of seismic data  
Method for controlling the phase spectrum of seismic data to match assumptions inherent in subsequent processing steps. The source signature, after processing with the same initial processing...
7519480 Driving-force output of a reciprocating actuator  
The force exerted by a reciprocating actuator is estimated as a weighted sum of three quantities: a reaction-mass acceleration, a baseplate acceleration, and a relative acceleration of the...
7515505 Method for continuous sweeping and separation of multiple seismic vibrators  
A method for simultaneously operating multiple seismic vibrators using continuous sweeps (little or no “listening” time between sweeps) for each vibrator, and recovering the separated seismic...
7508733 High-frequency processing of seismic vibrator data  
A method of processing seismic data obtained using a seismic vibrator that includes estimating travel times of direct wave arrivals between the seismic vibrator and an array of seismic receiver...
7440357 Methods and systems for determining signatures for arrays of marine seismic sources for seismic analysis  
Embodiments of the present invention provide systems and methods for deriving a source signature for an array of seismic sources for marine seismic analysis, wherein the systems and methods...
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...
7295490 System and method of phase encoding for high fidelity vibratory seismic data  
In accordance with the present invention, there is provided a method of determining whether a particular high fidelity vibratory seismic survey phase encoding is likely to be a good one based on...
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...
6678617 Mapping subsurface open fractures using elastically nonlinear interaction of two surface-generated waves  
This invention relates to mapping the open fractures in the reservoir subsurface formations. To map these open fractures, the elastically nonlinear interaction of the two surface generated seismic...
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...
6418079 Method of reducing harmonic interference while using overlapping source point seismic recording techniques  
Segmenting the spectral distribution of overlapped vibratory signals improves the efficiency of data acquisition while providing reduced harmonic distortion in the time zones of interest. Two...
6208587 Method of detecting seismic events and for detecting and correcting geometry and statics error in seismic data  
Methods are provided for automatic detection of linear seismic events and the detected events are used in correction of statics and geometry error. According to an example embodiment, a method is...
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...
5901112 Signal energy enhancement for seismic exploration  
Harmonics, which appear with seismic reflection signals and are responsive to actual vibrations of a land-vibrator for petroleum exploration, are effectively utilized in pulse compression...
5822269 Method for separation of a plurality of vibratory seismic energy source signals  
A method for separating and pre-processing vibratory source data includes varying the phase of vibratory sources according to two patterns. A first pattern is used for odd numbered sources while a...
5790473 High fidelity vibratory source seismic method for use in vertical seismic profile data gathering with a plurality of vibratory seismic energy sources  
A method for recording and pre-processing vertical seismic profile high fidelity vibratory seismic data includes the steps of measuring the motion of the vibrator which is related to the vibrator...
5774418 Method for on-line acoustic logging in a borehole  
An instant acoustic logging method for use in oil drilling is disclosed in which a drill bit arranged at one end of a drill string and rotated in a well is used as the acoustic source. The method...
5721710 High fidelity vibratory source seismic method with source separation  
A method of separating the effects of the earth response on vibratory energy from individual ones of multiple vibrators to geophones, in generating a seismic survey, is disclosed. According to the...
5719821 Method and apparatus for source separation of seismic vibratory signals  
A method of separating the effects of the earth response on vibratory energy from individual ones of multiple vibrators to geophones, in generating a seismic survey, is disclosed. According to the...
5511038 Process and device for detecting seismic signals in order to obtain vertical seismic profiles during bore drilling operations  
A process for preparing vertical seismic profiles (VSP) by bore drilling using, as the seismic source, the vibrations generated by the drilling bit. A cross-correlation between the bit signal and...
5410517 Method for cascading sweeps for a seismic vibrator  
A method for cascading or linking seismic vibrator sweeps to form a cascaded sweep sequence. According to the method, a first cascaded sweep sequence is generated containing N sweep segments...
5353223 Marine navigation method for geophysical exploration  
The present invention provides a method for on-line real-time processing of processing navigational data for determining the location of sensor and receiver points in a navigational network having...
5305285 Method and apparatus for subsoil exploration including emission of a series of seismic impulses  
Seismic impulses irregularly distributed in time (according to a random or a pseudorandom code for example) are transmitted into the soil, and the direct waves and those reflected by the subsoil...
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,...
5191557 Signal processing to enable utilization of a rig reference sensor with a drill bit seismic source  
An apparatus (10) for providing while drilling information on a subterranean geologic formation (28) includes a drilling rig (12) and a rotary drill bit (18) attached to the drilling rig (12) for...
5166905 Means and method for dynamically locating positions on a marine seismic streamer cable  
A marine seismic system includes a streamer cable which is towed by a vessel in a body of water. The streamer cable includes a plurality of hydrophones located at predetermined positions in the...
5151882 Method for deconvolution of non-ideal frequency response of pipe structures to acoustic signals  
A method of deconcolving the non-ideal frequency response from acoustic vibrations transmitted along a structure such as a drill string is disclosed. The deconvolution retains the values of the...
5134590 Method and apparatus for correcting the response of seismic sensors to an emission signal that does not have the same shape as a reference signal  
A method of correcting a seismic signal s(t) provided by a vibration sensor (100) in response to at least one emission signal F(t) produced by a least one seismic vibration generator (200). The...
4982374 Method of source coding and harmonic cancellation for vibrational geophysical survey sources  
A method is provided for significantly reducing the distortion and crossfeed from any selected order harmonic for any number of vibratory seismic sources operated concurrently, at the same time...
4969129 Coding seismic sources  
One or more seismic sources impart seismic pulses into the earth in a coded sequence. The coded sequence is composed of a minimum of three cycles of a Galois sequence of order N, where N is a...
4944036 Signature filter system  
A filtering system is provided for acquiring and processing signals using a sampled filter for signal separation and signal enhancement; such as for determing locations, distances, and times in a...
4926392 Method and apparatus for obtaining seismic vibrator reflection data  
A method and apparatus for obtaining seismic vibrator reflection data is disclosed with a significant signal to noise ratio. The earth is sinusoidally vibrated with source vibrations linearly...
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...
4864546 Vibrator seismic data correlation system  
A seismic data processing system utilizes vibration type shock waves which are delivered by a reactive mass (52) acting in conjunction with a base plate (50) to output low frequency shock waves to...
4837723 Method and apparatus for continuous time-variant digital filtering  
A continuous time-variant digital filtering method and apparatus. In particular, a method for continuous time-variant digital filtering of a digitized signal comprrises the steps of windowing the...
4823326 Seismic data acquisition technique having superposed signals  
Vibrator seismic sources are operated concurrently to reduce the time required for acquiring the data for a seismic survey. Separate seismic records are produced for each of the concurrently...
4799201 Methods and apparatus for reducing correlation sidelobe interference in seismic profiling systems  
In seismic profiling systems utilizing sweeps of signals which change in repetition frequency during the transmission interval, interference results from a spurious correlation against an...
4782446 Vibrator quality control method and system  
A field quality control system and real-time method for evaluating the performance of swept frequency vibrators is provided. The system includes independent sensing means adapted to be mounted...
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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