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7586810 Directional de-signature for seismic signals  
The present invention provides a method and apparatus for directional de-signature of a seismic signal. The method includes forming a plurality of far-field signatures representative of a plurality...
7535800 Seismic imaging and tomography using seabed energy sources  
In-sea seismic energy sources, deployed at or near the seabed, generate seismic waves in earth formations beneath the seabed when activated by a triggering mechanism at a precise time synchronized...
7496488 Multi-scale finite-volume method for use in subsurface flow simulation  
A multi-scale finite-volume (MSFV) method to solve elliptic problems with a plurality of spatial scales arising from single or multi-phase flows in porous media is provided. The method efficiently...
7466632 Method and apparatus for positioning a center of a seismic source  
The present invention provides a method and apparatus for positioning a center of a seismic source. The method includes determining a desired center-of-source of the seismic source and selecting...
7463549 Apparatus and method for carrying out seismic surveys  
A 4D seismic source comprising a series of sub-arrays of guns on flotation devices. Each flotation device has a GPS device. For firing, the guns in the e.g. three sub-arrays identified as being...
7359282 Methods and apparatus of source control for borehole seismic  
A method and apparatus for controlling seismic sources. The method and apparatus enable firing of a seismic sources at either a precise time or a precise position of the seismic source. Controlling...
7257049 Method of seismic surveying, a marine vibrator arrangement, and a method of calculating the depths of seismic sources  
A method of seismic surveying comprises emitting seismic energy at two or more different depths during a sweep. In one embodiment, the depth of a seismic source is varied during a sweep, by raising...
7218572 Method of seismic source monitoring using modeled source signatures with calibration functions  
Physical parameters are measured for an array of seismic sources, preferably for each activation of the seismic sources. Calibration functions are obtained and the measured physical parameters and...
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...
6944095 Terrestrial seismic acquisition process and apparatus, in particular for a vertical seismic acquisition  
A method for the acquisition of seismic signals, in which at least two sources of the air gun type are placed within one or more vertical holes extending in the subsoil and in which one or more...
6906981 Method and system for acquiring marine seismic data using multiple seismic sources  
A method for seismic surveying is disclosed which includes towing a first seismic energy source and at least one seismic sensor system. A second seismic energy source is towed at a selected...
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.
6791899 Acoustic logging apparatus and method for anisotropic earth formations  
The patent discloses a signal processing technique for determining the fast and slow shear wave polarizations, and their orientation, for acoustic waves in an anisotropic earth formation. The...
6571906 Underwater sound mitigation system for explosive testing  
A sound mitigation system and method reduce the transmission of acoustic output from explosions underwater. The system is submerged to bottom terrain of a body of water and has at a series of...
6552961 Seismic source sensor  
A system for detecting source acoustic energy in seismic operations. The system is operable on land and in marine applications. On land, a piezoelectric film is positioned between a vibrator or...
6151556 Method and apparatus for doppler smear correction in marine seismology measurements  
A seismic system is provided with a method of reducing distortions caused by motion of a source and receiver in marine seismic measurements. In one embodiment, the seismic system comprises a...
6147928 Anti-noise component for flat cable  
An anti-noise component for a flat cable including a flat O-like ferrite core having a slit-like hole through which a flat cable is passed, and an openable and closeable case which covers the...
6091668 Static marine seismic system and method  
A system and method for periodically providing information about subsurface formations in a marine environment using a non-towed seismic signal source (3) and a static array of seismic signal...
6089345 Elastic wave exploration tool for wells  
A well tool in accordance with the invention comprises an attenuation device which attenuates tube waves associated with an elastic wave emission and/or reception set (1, 12). The attenuation...
6046959 Sound source arrangement  
A sound source arrangement for use in carrying out a seismic survey comprises flexible structural modules connected together end-to-end to form an elongated flexible structure of substantially...
6026056 Method and apparatus for reducing the effect of rough sea surface conditions on marine seismic sources  
6018494 Signature estimation of a seismic source  
A marine seismic survey is described which uses measurements made in a mid-field region of the source signature to correct an estimate of the far-field source signature as derived from individual...
5469404 Method and apparatus for seismic exploration  
A marine seismic signal source apparatus and method that maximizes the usable acoustical (db) energy of the array signature in a lower frequency bandwidth. The apparatus forms a three dimensional...
5457688 Signal processor having multiple paralleled data acquisition channels and an arbitration unit for extracting formatted data therefrom for transmission  
A system for acquiring data from a plurality of analog signal sources inces a multiple-channel asynchronously operating first-stage subsystem each channel of which outputs composite digital...
5247486 Method for determining the far-field signature of a plurality of seismic sources  
A method for determining a far-field signature FF(t) of a plurality of N seismic sources Si (i=1, . . . , N) comprises a stage of measuring a near-field signature NFi(t) of each seismic source Si....
5193077 Method and apparatus for improved seismic prospecting  
An improved method and apparatus for conducting seismic prospecting is provided wherein more accurate estimates of the source wavelet can be achieved. Receivers (202) detect pulses at vertically...
5184329 Method and device for optimizing the triggering of an array of marine seismic sources  
Each source of an array of seismic signal sources is associated with one or several sensors (Ci) which pick up the impulses the associated source emits at the time of triggering. The device...
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...
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...
4908801 Real-time simulation of the far-field signature of a seismic sound source array  
A method for extrapolating the far field signature of a seismic sound source array from near field measurements, by taking into consideration, the instantaneous firing and environmental parameters...
4868794 Method of accumulation data for use in determining the signatures of arrays of marine seismic sources  
In order to accumulate data from which the signature of an array of n interacting seismic sources 21 to 27, for instance marine seismic sources in the form of air guns, can be determined, the array...
4868793 Shared sub-array marine seismic source system  
Some of the laterally spaced air gun sub-arrays which are combined to form the sequentially fired source arrays of a marine prospecting system are shared between neighboring arrays. This double...
4858205 Multi-barrel air gun module  
The present invention comprises a multi-barrel seismic source air gun module for use in a marine environment, preferably comprising a plurality of air gun barrels symmetrically disposed in a single...
H000656 Method and system for controlling the moments of firing of marine seismic sources  
A method for controlling the firing times of a plurality of marine seismic sources which are towed as a seismic array behind a towing vessel is provided. The marine seismic sources are adapted to...
4827456 Method and device for determining the remote emission signature of a seismic emission assembly  
A method and device are provided for determining the remote emission signature of a seismic emission array. Interactions make the signatures of the different sources different from those that they...
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...
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...
4758997 Method and apparatus for the generation and transmission of signals for echo location and other signaling purposes, particularly in geophysical exploration  
A transmission from a hydroacoustic source, especially for underwater geophysical exploration, is generated in accordance with two binary codes (provided by two pulse trains or sequences having two...
RE32683 Stacked marine seismic source  
An arrangement of a plurality of individual gas expansible marine sources, wherein the positive portions of the primary shock waves are additive in effect, the negative portions of the primary...
4727956 Method and apparatus for signal improvement in marine seismic exploration  
A method of providing a marine seismic signal comprising the steps of: arranging a plurality of seismic sources into a seismic array having at least two seismic subarrays with each subarray having...
4725991 Method for controlling blasting operations  
A method for predicting the ground vibration and airborne noise at any position resulting from a blasting operation using the data obtained from one or more single-charge low level blasts. By using...
4712198 Process for optimizing the frequency spectrum of pulses emitted by an emission device comprising several seismic implosion forces  
A process is provided for optimizing the frequency spectrum of pulses emitted by implosion sources by attenuating the tripping or precursor peak preceding the main peak due to the implosion. A...
4658384 Method for determining the far-field signature of an air gun array  
The far-field pressure signature of an air-gun array is derived from near-field measurements. An array of air guns is deployed in the water at a desired depth. A hydrophone is suspended in the...
4644507 Scaling of sound source signatures in underwater seismic exploration  
The invention relates to a method of determining the location in the earth of sub-surface boundaries and/or the acoustic properties of sub-surface features substantially in the absence of the far...
4635746 Timing correction methods for seismic energy source operation  
A method for determining the effective or apparent firing time of a seismic source. The seismic detectors positioned at known distances from the source, but outside the non-linear acoustic region,...
4591864 Frequency independent twisted wave front constant beamwidth lens antenna  
A frequency independent constant beamwidth lens antenna concept is descri. The device may be configured in various ways such as with a cylindrical lens with a retina. The essential feature is that...
4590592 Display of response characteristics of seismic source arrays  
In seismic exploration, the response characteristics of an array of seismic sources is displayed by contours of equal values of amplitude response as a function of azimuth and dip angle in a...
4566083 Seismic timing control system  
A method for optimizing the acoustic signal-to-noise ratio during a useful maximal-length recording cycle within the time frame of a minimal-length recording episode. To implement the method,...
4511999 Gun shot control unit for seismic exploration  
A gun shot control unit for a seismic exploration system compensates for the inherent delay between the shot command signal and the actual occurrence of the seismic pulse. A digital clock is...
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...
Matches 1 - 50 out of 103 1 2 3 >