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Class 367/75 - Shear wave


Subclass of Class 367 - Communications, electrical: acoustic wave systems and devices
Definition: Subject matter wherein the acoustic waves consist of stresses
No. of patents: 235
Last issue date: 08/23/2011


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NumberTitleIssue Date
8004932Identification of stress in formations using angles of fast and slow dipole waves in borehole acoustic logging
Cross-dipole measurements are obtained in a borehole. By estimating a direction of polarization of the fast shear mode at low and high frequencies and comparing the estimated distances, a cause of anisotropy is established. Formation stresses and directions may be e...
08/23/2011
7872944Method of monitoring microseismic events
A microseismic method of monitoring fracturing operation or other passive seismic events in hydrocarbon wells is described using the steps of obtaining multi-component s-wave signals of the event; and using a linear derivative of S-wave arrival times of the signals ...
01/18/2011
7623412Anisotropy measurement while drilling
Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the ...
11/24/2009
7436735Method for seismic processing, in particular for compensating birefringence on seismic traces
A method of seismic processing for obtaining information on the geophysics of the subsoil includes acquiring seismic traces at at least one point on the surface of the subsoil or in the subsoil, the seismic traces corresponding on each occasion to two perpendicular ...
10/14/2008
7408836Method of and apparatus for processing seismic data in the presence of anisotropy
A method of and apparatus for processing seismic data. A method of processing seismic data comprising the steps acquiring seismic data in at least two shots that have different source-receiver azimuths from one another, and selecting events arising from interface se...
08/05/2008
7391675Microseismic event detection and location by continuous map migration
The present invention provides methods and systems for microseismic hydraulic fracture monitoring in real-time. The methods and systems of the present invention may include continuous map migration of recorded microseismic signals. The methods and systems provide ro...
06/24/2008
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
7349807Quantitative risk assessment applied to pore pressure prediction
Pre-drill pore pressure and fracture gradient predictions obtained from seismic velocity data are used in well design taking into account uncertainties in the velocity estimation and in the models that use the velocities to determine pore pressure. Using geological ...
03/25/2008
7310580Method for borehole measurement of formation properties
The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole...
12/18/2007
7301852Methods of generating directional low frequency acoustic signals and reflected signal detection enhancements for seismic while drilling applications
The present invention provides a method and apparatus for using an acoustic logging tool conveyed in a borehole in an earth formation for determining a characteristic of the formation. The method comprises using a first acoustic source for generating an acoustic sig...
11/27/2007
7292943System and method for control of seismic data acquisition
The present invention provides an interactive system for controlling seismic data acquisition. A central controller controls seismic sources, detectors and receivers. A user/operator is provided one or more views of the operational components over a graphical user i...
11/06/2007
7260021Method 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 plurality of sweep data sets and a correlation reference sequence. The...
08/21/2007
7257492Handling of static corrections in multiple prediction
A method is for use in seismic data processing includes improving the continuity of the primary events in an original seismic dataset to create a continuous, seismic dataset; predicting at least the first order multiples of the original seismic dataset from the cont...
08/14/2007
7257489Quadrupole acoustic shear wave logging while drilling
A tool generates signals indicative a shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiv...
08/14/2007
7177765Method of general elastic inversion by combination of calculated pseudo-shear and measured compressional seismic amplitude information
A method designed to combine both pseudo compressional interval velocity and pseudo shear interval velocity from seismic data for predicting fluid type and porosity in oil and gas exploration. The first step is the generation of ψS, pseudo shear reflectivity data, ...
02/13/2007
7173542Data relay for casing mounted sensors, actuators and generators
A casing sensor and methods for sensing using a casing sensor are disclosed. The casing sensor includes a casing shoe and a sensor coupled to the casing shoe. A casing data relay includes a downhole receiver coupled to a well casing and a transmitter coupled to the ...
02/06/2007
7164619Method of processing marine seismic data and a method of seismic surveying
A method of determining seismic properties of a layer of the seabed, in particular a surface or near-surface layer (5), comprises directing seismic energy propagating in a first mode at a boundary face of the layer so as to cause partial mode conversion of th...
01/16/2007
7085195Method for detecting earth formation fractures by seismic imaging of diffractors
A method is disclosed for seismic imaging of subsurface diffractors. The method includes performing migration velocity analysis on a seismic time record section and depth migrating the time section for offsets exceeding one-half a distance between a seismic energy s...
08/01/2006
7082368Seismic event correlation and V-Vestimation
A method of correlating seismic events associated with different types of seismic transmission modes and includes calculating a shift estimate between a first set of seismic events or attributes associated with the seismic events attributable to one type of transmis...
07/25/2006
7079449Methods and systems for low frequency seismic and infrasound detection of geo-pressure transition zones
Methods for determining the existence and characteristics of a gradational pressurized zone within a subterranean formation are disclosed. One embodiment involves employing an attenuation relationship between a seismic response signal and increasing wavelet waveleng...
07/18/2006
7069200Method intended to obtain reflection travel times from an interpretation of migrated cylindrical wave seismic data
A method intended to obtain reflection travel times from an interpretation of seismic data in migrated cylindrical waves, for a given value of the parameter defining the slope of these waves, or the superposition of such data associated with various substantially pa...
06/27/2006
7058513Method of seismic exploration by discriminating horizontal and vertical shear waves
The invention is a method of geophysical exploration using seismic methods. The receivers and the source are rotated to one another, such that the orthogonal excitations of the seismic source are readily differentiated. The differentiation of the differently excited...
06/06/2006
7046165Method for collecting geological data ahead of a drill bit
A casing sensor and methods for sensing using a casing sensor are disclosed. The casing sensor includes a casing shoe and a sensor coupled to the casing shoe. A casing data relay includes a downhole receiver coupled to a well casing and a transmitter coupled to the ...
05/16/2006
7042802Determination of stress characteristics of earth formations
A method for determining the maximum and minimum horizontal stresses of formations surrounding a borehole includes the following steps: suspending a logging device in the borehole; transmitting sonic energy from the logging device to establish flexural waves in the ...
05/09/2006
7035165Imaging near-borehole structure using directional acoustic-wave measurement
Directional acoustic measurements made in the borehole are used for imaging a near-borehole geological formation structure and determination of its orientation. Four-component cross-dipole data set measured in a deviated borehole in combination with the directionali...
04/25/2006
6985086Method and apparatus for LWD shear velocity measurement
The logging tool of this invention includes a transmitter conveyed on a drilling collar for exciting a quadrupole signal in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off ...
01/10/2006
6985815Instantaneous spectral analysis
A method of seismic data processing is described in which a particular wavelet is selected from a plurality of wavelets as being most characteristic of a received seismic signal. A subtracted signal can be determined by subtracting a weighted signal of the particula...
01/10/2006
6970397Determination of fluid properties of earth formations using stochastic inversion
A method of determining a fluid property in a subsurface region of interest of an earth formation uses measurements of seismic attributes on seismic data. For a test region, a plurality of realizations of rock properties are specified, and for each of the realizatio...
11/29/2005
6954403Concurrent phase angle graphic analysis
Waveform data, such as reflection seismic data, is filtered by concurrently analyzing various phase angles of the data. The various phase angles of the data are compared to phase rotated background trends and the phase angle producing the maximum deviation from the ...
10/11/2005
6954402Method of wave diagnostics of the oil-and-gas-deposit
A method of diagnostics of oil-and-gas deposit for seismic survey on the basis of the complex of waves of the different types. It is performed by means of the insonification of the vicinity of the borehole by the seismic waves, the recording of the displacement vect...
10/11/2005
6944094High resolution determination of seismic polar anisotropy
A method and apparatus for high-resolution measurement of seismic anisotropy, comprising: a recording system, a borehole having an axis that is deviated from the vertical by a known acute angle; a housing that is adapted to travel within the borehole and that is in ...
09/13/2005
6930616Method and apparatus for LWD shear velocity measurement
Array quadrupole data obtained in a LWD environment are processed to determine the shear velocity of an earth formation taking into account dispersion effects caused by the logging tool. When this processing is done in an azimuthally anisotropic formation, the shear...
08/16/2005
6925031Method of using electrical and acoustic anisotropy measurements for fracture identification
Measurements made by a cross-dipole acoustic logging tool in a borehole are processed to determine the principal directions of azimuthal anisotropy of a subsurface formation. Measurements indicative of azimuthal resistivity variations are also made with a multicompo...
08/02/2005
6920082Method and apparatus for determining earth formation shear-wave transverse isotropy from borehole stoneley-wave measurements
The present invention is a method of determining formation horizontal shear wave velocity, formation transverse isotropy and an effective logging tool modulus. The method comprises determining an effective logging tool modulus by modeling the logging tool as a fluid...
07/19/2005
6909666Method and apparatus for generating acoustic signals for LWD shear velocity measurement
An acoustic logging apparatus comprises a drill collar conveyed on a drilling tubular in a borehole within a formation. At least one transmitter is disposed in the drill collar. The transmitter includes at least one magnetostrictive actuator cooperatively coupled by...
06/21/2005
6904368Seismic 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...
06/07/2005
6850168Method and apparatus for LWD shear velocity measurement
The logging tool of this invention includes a transmitter conveyed on a drilling collar for exciting a quadrupole signal in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off ...
02/01/2005
6826485Determination of the fast and slow shear wave polarisation directions
A method of determining the polarisation directions of the fast and slow shear waves arising from shear wave splitting due to anisotropy, said directions defining a natural coordinate system, the method comprising the steps of: a) ...
11/30/2004
6791899Acoustic 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 signal processing method decomposes composite received waveforms a number ...
09/14/2004
6731568Seismic prospecting method using converted wave processing
A seismic prospection method in which a compression seismic wave is emitted into the subsoil and sensors are used to collect seismic data having at least a shear component, and in which the data corresponding to said shear component is processed to deduce informatio...
05/04/2004
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