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Class 702/17 - Filtering or noise reduction/removal


Subclass of Class 702 - Data processing: measuring, calibrating, or testing
Definition: Subject matter comprising means for removing certain frequency
No. of patents: 388
Last issue date: 01/10/2012


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NumberTitleIssue Date
8095320Method, program product, and system for suppression of residual water bottom energy in surface seismic data
Systems, program product, and methods of suppressing residual water bottom energy in seismic data, are provided. An example of a system, program product, and method can be applied to post-stack datasets and can combine multi-channel deconvolution with novel sorting ...
01/10/2012
7987054Efficient multiple prediction in two and three dimensions
A method is disclosed that uses (a) source-receiver reciprocity and (b) a method such as ISR DMO (U.S. Patent Application Publication No. 2006/0098529) that allows reconstruction of densely sampled gathers at arbitrary surface locations, to efficiently predict multi...
07/26/2011
7957906Method for attenuating low frequency noise in a dual-sensor seismic streamer
A calculated vertical velocity sensor signal is determined from a recorded pressure sensor signal. A constructed vertical velocity sensor signal is determined as a linear combination of the calculated vertical velocity sensor signal and a recorded vertical velocity ...
06/07/2011
7953556Geophone noise attenuation and wavefield separation using a multi-dimensional decomposition technique
Methods and apparatus for processing dual sensor (e.g., hydrophone and vertical geophone) data that includes intrinsic removal of noise as well as enhancing the wavefield separation are provided. The methods disclosed herein are based on a decomposition of data simu...
05/31/2011
7937224Diplet-based seismic processing
Methods, systems, and software for generating a multi-dimensional volume are disclosed. The methods include decomposing one or more original volumes into a collection of diplets, wherein each diplet includes information about spatial location, orientation, amplitude...
05/03/2011
7835867Determination of the bearing from a geophone to a seismic source
Techniques are disclosed for determining the bearing from a three-axis geophone to a seismic source, such as a person or other man-made seismic source. In one embodiment, the techniques are implemented as a method that includes receiving outputs from a three-axis ge...
11/16/2010
7761237Method for quantification and mitigation for dip-induced azimuthal AVO
This patent delineates methods for quantifying and mitigating dip-induced azimuthal AVO effects in seismic fracture detection using Azimuthal AVO analysis by accurately accounting for the divergence correction and azimuthal dependence of the reflection angle. Soluti...
07/20/2010
7742876Wavefield decomposition for cross-line survey
It is described a method for spatially filtering 3D seabed seismic data acquired in a cross-line geometry including methods of how to decompose the data using a filter with two spatial components. ...
06/22/2010
7725266System and method for 3D frequency domain waveform inversion based on 3D time-domain forward modeling
According to a first preferred aspect of the instant invention, there is provided an efficient method of computing a 3D frequency domain waveform inversion based on 3D time domain modeling. In the preferred arrangement, 3D frequency domain wavefields are computed us...
05/25/2010
7720609Method of seismic signal processing
A method of assessing acquisition errors in seismic images in a seismic data volume. The method includes selecting a seismic attribute in a seismic data volume and then stacking seismic quality image measurements taken along the selected attribute. The stacked measu...
05/18/2010
7715988Interpolating and deghosting multi-component seismic sensor data
A technique includes obtaining particle motion data and pressure data that are acquired by seismic sensors while in tow. The sensors are part of a plurality of streamers, and the pressure and particle motion data contain surface ghosts. The technique includes proces...
05/11/2010
7680600Method, system and apparatus for formation tester data processing
A method for data processing includes transforming measurement data acquired in the time domain during an oilfield operation into a second domain to produce transformed data; identifying distortions in the transformed data; removing the distortions from the transfor...
03/16/2010
7676327Method for optimal wave field separation
A technique for decomposing a recorded wave field represented in a set of multicomponent, marine seismic data centers around a computer-implemented method including: estimating the statistics of the noise terms in each one of a predetermined group of seismic measure...
03/09/2010
7664603Electromagnetic wavefield analysis
A method of analyzing an electromagnetic wavefield includes the steps of measuring the electric and magnetic fields at at least one receiver, formulating a respective spatial domain filter in respect of each of mutually orthogonal components of each of the electric ...
02/16/2010
7627433Phase 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 used on the data, is used to design a phase control filter that shap...
12/01/2009
7599798Migrating composite seismic response data to produce a representation of a seismic volume
A subterranean structure is characterized using composite seismic response data received from a plurality of sources. Phase encoding is applied to the data in which phase shifts are selected based on frequency variation of noise terms. The phase-encoded data is then...
10/06/2009
7587279Method for quantitative PCR data analysis system (QDAS)
This invention provides a method for the quantitation and quality assurance of QPCR data. In particular, the invention provides a method for extracting data curves from a QPCR assay, estimating the shape and characteristics of an amplification curve and producing a ...
09/08/2009
7584057Seismic acquisition and filtering
An iterative process is described for obtaining a finite impulse filter to remove noise from seismic data through an iterative process with constraints on the filter applied in both, the original space-time and the transform frequency wave number at each iteration s...
09/01/2009
7574303Seismogram correction for absorption effects
Correcting seismograms to compensate for absorption or dissipative effects that occur in the earth. In one implementation, a ratio of traveltime (t) to absorption parameter (Q) may be computed for each seismogram. The ratio may be referred to as R. Further, the rati...
08/11/2009
7536262Kalman filter approach to processing electromagnetic data
A method for tracking a sinusoidal electromagnetic signal in noisy data using a Kalman filter or other tracking algorithm. The method is useful for controlled source electromagnetic surveying where longer source-receiver offsets can cause the source signal to decay ...
05/19/2009
7519477Method for determining impedance coefficients of a seismic trace
A method for determining impedance coefficients of a seismic trace comprises determining reflection coefficients of the seismic trace, for example using a sparse spike inversion, integrating the reflection coefficients with respect to time to obtain impedance coeffi...
04/14/2009
7454292Inverse-vector method for smoothing dips and azimuths
A system and method using inverse-vector processing to iterate through a loop of three steps: set a guide direction, invert opposite vectors, and average vectors to update the guide direction, for smoothing seismic amplitude data. The inverse-vector method can overc...
11/18/2008
7433265Converted 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 from the input data. The data with the P-wave primary energy removed...
10/07/2008
7426439Method and apparatus for marine seismic data acquisition
The present invention provides a method and apparatus for seismic data acquisition. One embodiment of the method includes accessing data acquired by at least two particle motion sensors. The data includes a seismic signal and a noise signal and the at least two part...
09/16/2008
7415401Method for constructing 3-D geologic models by combining multiple frequency passbands
A process for constructing a three-dimensional geologic model of a subsurface earth volume wherein resolution scales of multiple diverse data types, including seismic data, are accounted for by generating multiple frequency passband models and combining them togethe...
08/19/2008
7382682Processing 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 determining a signal-only prediction filter from the seismic data at ...
06/03/2008
7382685Method 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 least partially not coincident with the data points and using the de...
06/03/2008
7379386Workflow for processing streamer seismic data
A method includes conditioning a set of multicomponent seismic data and sensor orientation data, the multicomponent seismic data including pressure data and particle motion data, acquired in a towed array, marine seismic survey; digital group forming the conditioned...
05/27/2008
7376517Method for estimation of interval seismic quality factor
The present invention includes a method for determining interval values of seismic quality factor, Q, from seismic data. Seismic data is recorded and preprocessed as necessary. Estimates of amplitude spectra are determined from the seismic data. Logarithms are taken...
05/20/2008
7373251Method for predicting quantitative values of a rock or fluid property in a reservoir using seismic data
A method is provided for predicting a value of a designated rock or fluid property in a subterranean geologic volume. A first predicted value of the designated rock or fluid property is also assigned to a volume of a multi-dimensional, multi-scale model. A first pre...
05/13/2008
73732523D pre-stack full waveform inversion
A method, comprising: generating a macro P-wave velocity model, including resolution of residual moveout errors, using reflection tomography from a seismic data set; generating a diffraction response from the macro P-wave velocity model for a given common image gath...
05/13/2008
7369944Method of processing seismic data for AVO or AVOA characterization
The invention relates to a method of processing seismic data comprising a gather of seismic traces organised according to one or several acquisition parameters, each trace comprising a seismic signal defined by an amplitude as a function of time or depth, the method...
05/06/2008
7366054Tau-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 gathers in an offset-time domain without correcting the data for normal mo...
04/29/2008
7359283System for combining signals of pressure sensors and particle motion sensors in marine seismic streamers
Signals of pressure sensors and particle motion sensors located in marine seismic streamers are combined to generate pressure sensor data and particle motion data with substantially the same broad bandwidth. The noisy low frequency part of the motion signals are cal...
04/15/2008
7355923Seismic analysis using post-imaging seismic anisotropy corrections
System and method for performing anisotropy corrections of post-imaging seismic data for a subsurface formation. The method may receive seismic data, preferably pre-stack seismic data comprising a plurality of traces, e.g., collected from a plurality of source and r...
04/08/2008
7356075Method and apparatus for signal separation
An embodiment of a method for parameterizing an input signal includes non-linearly transforming the input signal, removing higher order terms by passing the input signal through a low pass filter to produce a linear combination of data symbols and DC components, sol...
04/08/2008
7356414Seismic image deformation method for improved interpretation
The present invention is a method of geometric deformation of a seismic image for interpretation. The method includes selecting a geologic layer represented in the seismic image determining by stratigraphic modeling a mean topographic depositional surface for said l...
04/08/2008
7336561System for attenuation of water bottom multiples in seismic data recorded by pressure sensors and particle motion sensors
An up-going wavefield and a down-going wavefield are calculated at a sensor position from a pressure sensor signal and a particle motion sensor signal. Then, an up-going wavefield is calculated at a water bottom position substantially without water bottom multiples ...
02/26/2008
7337070Method for treating seismic cubes corresponding to obtained for common zone at different times
Method of processing a collection of seismic cubes corresponding to one and the same acquisition zone and to various moments of acquisition, characterized in that at least one seismic cube which is an estimate of the component common to at least two seismic cubes co...
02/26/2008
7333392Method for estimating and reconstructing seismic reflection signals
A method for reconstructing seismic data signals of poor quality to improve the signal-to-noise ratio of the data for display and analysis in connection with the selection of drilling sites for recovery of hydrocarbons. The method includes providing a signal model b...
02/19/2008
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