|
Match
|
Document |
Document Title |
|
|
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 steps...
|
|
|
7602670 |
Method of seismic surveying
A method enables the time required to complete a seismic survey and the noises recorded in the seismic data to be reduced. One aspect of the method includes actuating a first vibrator group to...
|
|
|
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 include...
|
|
|
7382684 |
Method for selective bandlimited data acquisition in subsurface formations
The method for exploring desired characteristics of a subsurface sector, having at least one resonant frequency, is based on selectively transmitting suitable narrowband energy waves into the...
|
|
|
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 T 0 and vibrators in a second vibrator group are actuated at time T 1, ...
|
|
|
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 an...
|
|
|
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...
|
|
|
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 T 0 , and subsequently actuating the or each vibrator in a second vibrator...
|
|
|
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 linked...
|
|
|
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 with...
|
|
|
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...
|
|
|
4766574 |
Method for depth imaging multicomponent seismic data
The present invention relates generally to a method of geophysical exploration and more particularly to a novel method for imaging multicomponent seismic data to obtain better depth images of the...
|
|
|
4718048 |
Method of instantaneous acoustic logging within a wellbore
Method of instantaneous acoustic logging within a wellbore. The method is characterized in that it consists of locating on drill-pipe and ground recordings elementary recordings corresponding to...
|
|
|
4715021 |
Method for filtering and combining seismic data having different spectral characteristics
A method of filtering and combining seismic data, such as data from two or more seismic sources having different spectral characteristics. A plurality of seismic signals are transmitted into a...
|
|
|
4707812 |
Method of suppressing vibration seismic signal correlation noise
A method of seismic prospecting in which there is employed conventional upsweep and downsweep and opposed polarity of signals that are being sent into the earth as seismic signals and in which...
|
|
|
4706224 |
Method of vertical seismic profiling and exploration
The present invention generally relates to a method of seismic exploration. In particular, a novel method of obtaining a vertical seismic profile of the earth's subterranean formation surrounding a...
|
|
|
4686654 |
Method for generating orthogonal sweep signals
A first sweep signal consists of a plurality of waveforms having non-invariant fundamental periods exhibiting a monotonic frequency progression of at least one octave over the duration of the...
|
|
|
4686655 |
Filtering system for processing signature signals
A filtering system is provided for acquiring and processing signals using a sampled filter for signal separation and signal enhancement; such as for determining locations, distances, and times in a...
|