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7564740 |
Methods of enhancing separation of primary reflection signals and noise in seismic data using radon transformations
Improved methods of processing seismic data which comprise amplitude data assembled in the offset-time domain in which primary reflection signals and noise overlap are provided for. The methods...
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7561491 |
Radon transformations for removal of noise from seismic data
Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. Assembled seismic data are transformed from the offset-time domain to the...
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7558154 |
Method of and apparatus for processing seismic data
A method determining a calibration filter to calibrate a first component of multi-component seismic data relative to a second component of the seismic data comprises determining the calibration...
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7551515 |
Source signature deconvolution method
A method of filtering seismic signals is described using the steps of obtaining the seismic signals generated by activating a seismic source and recording signals emanating from the source at one...
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7508734 |
Method and apparatus for acoustic data transmission in a subterranean well
The disclosure describes a method and apparatus for effectively communicating data along an acoustic transmission path. The method comprises driving an acoustic transmitter to send a data signal...
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7447114 |
Non-linear seismic trace matching to well logs
A method and apparatus for seismic trace matching to well logs.
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7436734 |
Shaped high frequency vibratory source
The present invention is a method of processing seismic data in which one or more seismic vibrators are activated with one or more pilot signals and vibrator motions are recorded along with seismic...
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7433265 |
Converted wave energy removal from seismic data
Coherent wave noise energy is removed from seismic data by modeling both the P-wave primary energy and the coherent wave noise energy. The P-wave primary energy is modeled first and then subtracted...
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7382685 |
Method and apparatus for filtering irregularly sampled data
A method and apparatus for filtering data acquired at a plurality of discrete data points is described, using the steps of defining a filter having defined filter values at defined filter points at...
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7382682 |
Processing seismic data
The invention relates to processing seismic data that contains both a desired signal and swell noise. The method is applicable to seismic data is in the frequency-space domain method and comprises...
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7366054 |
Tau-P filters for removal of noise from seismic data
Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. The methods comprise the steps of assembling seismic data into common geometry...
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7239578 |
Removal of noise from seismic data using radon transformations
Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. The methods comprise the steps of assembling seismic data into common geometry...
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6987706 |
Removal of noise from seismic data using high resolution radon transformations
Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. The seismic data is transformed from the offset-time domain to the time-slowness...
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6961283 |
Adaptive filtering apparatus and method for seismic data acquisition
The present invention provides an adaptive filtering method for substantially eliminating ground roll noise encountered during seismic data acquisition. An apparatus for acquiring seismic data is...
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6956790 |
Borehole sonic data processing method
A method of processing sonic wireline or logging while drilling data acquired in a borehole that includes filtering the sonic data to attenuate tool-borne and borehole-borne arrivals; migrating the...
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6912467 |
Method for estimation of size and analysis of connectivity of bodies in 2- and 3-dimensional data
A method for performing region growing in a data volume that accounts for noise in the data on a probabilistic basis. The data volume is divided into discrete cells, and a probability distribution...
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6882938 |
Method for separating seismic signals from two or more distinct sources
A method is disclosed for separating energy resulting from actuating at least two different seismic energy sources from seismic signals. The sources are actuated to provide a variable time delay...
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6856575 |
Monitoring a microseismic event
A method of monitoring a microseismic event includes detecting the event to produce a first signal dependent on the event. The first signal includes noise at a frequency of, for example 50 Hz. A...
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6836448 |
System and method for seismic wavefield separation
A system and method of creating a filter for use with locally dense seismic data is disclosed. The method includes obtaining survey geometry characteristics from a locally dense seismic survey. A...
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RE38567 |
Apparatus and method for self adjusting downlink signal communication
An apparatus for sending signals downhole during drilling operations uses a main pump to pump mud from a mud pit at a substantially constant flow rate. The bulk of the pumped mud goes downhole to...
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6757217 |
Method for time-aligning multiple offset seismic data volumes
Near-offset and far-offset seismic data volumes are time-aligned by first selecting a plurality of time shifts. The near-offset and far-offset seismic data volumes are cross-correlated at the...
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6691073 |
Adaptive state space signal separation, discrimination and recovery
This invention unifies a set of statistical signal processing, neuromorphic systems, and microelectronic implementation techniques for blind separation and recovery of mixed signals. A set of...
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6674689 |
Method for morphologic analysis of seismic objects
A method for analyzing and classifying the morphology of seismic objects extracted from a 3D seismic data volume. Any technique may be used to extract the seismic objects from the 3D seismic data...
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6636816 |
Vector signal analysis method and apparatus therefor
An error-suppression signal measurement system and method therefor is provided. The system transmits a test signal from a first probe, through a device under test, and into a second probe. The...
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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...
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6353577 |
Seismic sensor units
A seismic sensor unit ( 10 ) comprises a case ( 12 ) containing electronic circuits ( 18, 20 ) that serve to digitise and digitally process the output signals of a seismic sensor element ( 16 )...
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6201764 |
Apparatus and method for correcting for capacitance variations in hydrophones
A method and an apparatus are provided for matching the response of hydrophones 22 to the response of geophones 24 and significantly reducing response variations between hydrophones caused by...
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6161076 |
Seismic data acquisition and processing using non-linear distortion in a vibratory output signal
A method for improving vibratory source seismic data uses a filter which converts a recorded seismic groundforce signal (including harmonic distortion therein) into a desired short-duration...
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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...
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6091669 |
Method of determining, displaying and using the relative changes of elastic modulus and density of underground rock
The general object of the present invention is to provide a method for determining and displaying the relative changes of elastic moduli and that of density of geologic formations and for utilizing...
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6028823 |
Geodetic position estimation for underwater acoustic sensors
A system and survey method for estimating the geodetic position of acoustic sensors placed at fixed but unknown locations on the seafloor is disclosed. Bottom mounted sensors are surveyed using an...
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6018500 |
Radon moveout
A conventional CMP gather is Radon transformed from t-x space to the τ-p domain. The Radon-transformed data are windowed or zoned into a plurality of data sets, each having an common independent...
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5982706 |
Method and system for determining normal moveout parameters for long offset seismic survey signals
A method and computer system for deriving and applying normal moveout corrections to seismic survey traces is disclosed. In each common midpoint (CMP) gather, a stacking velocity function of travel...
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5971095 |
Noise filtering method for seismic data
A method for filtering noise from discrete noisy seismic signals in a time interval ([1, . . . , T]) is provided. The method comprising the steps of using the noisy seismic signals for determining...
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5831934 |
Signal processing method for improved acoustic formation logging system
A method for analyzing received wave signal data in an acoustic logging system that includes a logging tool adapted to be moved through a borehole in the earth and comprising a transmitter section...
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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...
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5719822 |
Seismic data radon dip moveout method
A method of processing seismic signal data that uses a special Radon transform for dip moveout (DMO) including the steps of applying conventional pre-DMO steps to the traces, applying a special...
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5594706 |
Downhole processing of sonic waveform information
Methods for processing sonic logging data obtained by a sonic imaging tool or an MWD tool are provided. The sonic logging data are bandpass filtered and sampled according to techniques such as...
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5511008 |
Process and apparatus for extracting a useful signal having a finite spatial extension at all times and which is variable with time
A process for the extraction of a time-variable useful signal having a finite spatial extension by an array of N sensors or transducers (N being equal to or greater than 3), that receive the useful...
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5491669 |
Method for identifying and suppressing anomalous frequency components in seismic data
A method for spectral noise abatement from seismic data. The data are decomposed into organizational components from which a noise component can be resolved by well-known iterative methods. A...
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5400299 |
Seismic vibrator signature deconvolution
A method for processing seismic vibrator data. The method utilizes a deterministic signature deconvolution of the vibrator data to compress the impulse response of the data resulting in sharper,...
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5287328 |
Method for removing random source and receiver noise from seismic traces
Recorded seismic traces are gathered into common offset groups. Within each group, the traces are arranged according to shot point number. Mean and standard deviations are determined for each...
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5274604 |
Method for spatially filtering signals representing formation and channel echoes in a borehole environment
A method and apparatus for spatially filtering a signal set to enhance interface echoes representing a borehole configuration. The spatial filtering technique provides information regarding the...
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5237538 |
Method for removing coherent noise from an array of seismic traces
A space time gate is selected surrounding a coherent noise to be removed from an array of seismic traces. Signal-plus-noise within the selected gate is extracted from the array of seismic traces....
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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...
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5182730 |
Method and apparatus for transmitting information in a borehole employing signal discrimination
In conducting measurement operations in drill holes useful downhole information is obtained by selectively filtering data signals carrying the information from mixed signals. The mixed signals...
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5182729 |
Reduction of sideswipe noise from seismic data by null steering
Disclosed is a seismic surveying and data processing method to filter from seismic data any energy contributions that are not in the seismic line of profile. The surveying method requires a...
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5150333 |
Method and apparatus for providing improved pressure pulse characteristics for measuring while drilling
This invention deals with a telemetering system in logging while drilling which utilizes pressure pulses in the drilling fluid circulation system. More specifically this invention deals with...
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5146433 |
Mud pump noise cancellation system and method
Methods for recovering a LWD or MWD data signal in the presence of mud pump noise are provided and generally comprise calibrating the drilling mud pressure as a function of the mud pump piston...
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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...
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