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| Number | Title | Issue Date |
| 7466626 | Seismic surveying arrangement A seismic surveying arrangement comprises a vertical source array (26) having at least two sources (27,28) of seismic energy. The source array (26) is disposed such that a first source (28) is located within a weathered layer (35) ... | 12/16/2008 |
| 7414919 | Method for improving the seismic resolution A method for improving the seismic resolution in the field of petroleum exploration and development, using the steps of: (1) ensuring the depth and the velocity of the low-velocity layer and the high-velocity layer and the characteristic of the frequency spectrum of... | 08/19/2008 |
| 7408836 | Method 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 |
| 7359284 | Method for processing borehole seismic data Seismic data recorded by subsurface seismic sensors placed in a borehole, such as an oil or gas well, are transformed via a process of upward wavefield propagation to pseudo-receivers at the surface of the earth. The seismic data thus transformed can be processed as... | 04/15/2008 |
| 7328139 | Device and software package for extracting a geological horizon and related properties The invention concerns a method for extracting a geological horizon and related properties of a seismic representation, comprising a step (100) which consists in digital modeling with continuous local seismic traces, calculating the optimal offset and definin... | 02/05/2008 |
| 7167820 | Apparatus for and method of testing applications A receiver/decoder (for example for digital television) normally receives and/or decodes transmitted data in a normal transmitted signal. In order to test an application running on the receiver/decoder, a special test signal could be generated, or a normal signal co... | 01/23/2007 |
| 7154812 | Method for retrieving local near-surface material information The invention concerns a method for retrieving local near-surface material information including the steps of:—providing a group of receivers comprising at least one buried receiver and at least one surface receiver positioned either at or very near the Earth surf... | 12/26/2006 |
| 6982928 | Seismic P-wave velocity derived from vibrator control system P-wave velocity in a near-surface region of a land area is estimated from a combination of seismic data based upon waves in the near-surface region generated in response to a shock in each of a plurality of upholes drilled in the land area and vibrator dynamic data ... | 01/03/2006 |
| 6944546 | Method and apparatus for inversion processing of well logging data in a selected pattern space Method and apparatus for deriving information regarding a subsurface geophysical formation. Well logging data is acquired for the subsurface geophysical formation. Geometrical parameters for the subsurface geophysical formation are determined by inversion processing... | 09/13/2005 |
| 6868037 | Use of drill bit energy for tomographic modeling of near surface layers A method for tomographic modeling of seismic wave travel times from well drilling records generated by drill string vibrations during drilling and identifying in the recorded vibration at least one of direct, reflected, refracted, converted and diving waves so as to... | 03/15/2005 |
| 6612398 | Methods for measurement, analysis and assessment of ground structure For determination of the laminar structure and other characteristics of a ground, oscillation sensors for detecting the vertical component or vertical and horizontal components of oscillations are disposed at three or more points within a comparatively sm... | 09/02/2003 |
| 6253870 | Methods for measurement, analysis and assessment of ground structure For determination of the laminar structure and other characteristics of a ground, oscillation sensors for detecting the vertical component or vertical and horizontal components of oscillations are disposed at three or more points within a comparatively sm... | 07/03/2001 |
| 6081482 | Semi-recursive imaging under complex velocity structures A computationally efficient semi-recursive Kirchhoff migration algorithm is capable of obtaining accurate images of complex structures in complex geological environments which commonly give rise to multivalued arrivals. The method alternates wave-equation... | 06/27/2000 |
| 5764516 | Method and system for surface-consistent phase and time lag correction of seismic data A computer system and method for correcting seismic data for phase distortion due to the effects of the near-surface layer are disclosed. Phase error corrections are performed on multiple frequency bands, beginning with a primary band and then proceeding ... | 06/09/1998 |
| 5629905 | Method of datuming seismic data and method of processing seismic data Disclosed is a method of datuming seismic trace data from a first horizon to a lower second subsurface horizon, both located above a target horizon. A seismic source and receiver are positioned along the first horizon and each assigned a coordinate repres... | 05/13/1997 |
| 5587968 | Method for measuring the near-surface shear wave velocity for use in determining 3-component 3-D statics In the presence of an anisotropic near-surface earth layer, orthogonally oriented microspreads are provided from which shear-wave velocity vectors Vsiθ and Vsθ may be determined. The respective velocities are calculated from measur... | 12/24/1996 |
| 5532976 | Curved-ray replacement dynamics A method of geophysical prospecting wherein nonhyperbolic distortion is reduced from marine seismic data, or land seismic data over a low seismic velocity layer, is disclosed. The method comprises replacing the seismic velocity of the water or low seismic... | 07/02/1996 |
| 5502687 | Method for datumizing seismic data by forward modeling Disclosed is a method for processing geophysical data that have been gathered over irregular topography. According to the method, a datum is established that lies above the highest topographic peak. The data are time-shifted from the surface to the datum ... | 03/26/1996 |
| 5500832 | Method of processing seismic data for migration Disclosed is a technique for processing seismic data to enable the data to be migrated without stacking. Seismic data provided in common midpoint gathers are converted to a domain defined in terms of the travel time and the first power of velocity of refl... | 03/19/1996 |
| 5157638 | Method of deriving statics corrections from common reflection point gathers A method for static correction includes a three step process which eliminates the problems of assuming hyperbolic moveout curves and forming base traces from common midpoint gathers while addressing long spatial wavelength variations. First, after calcula... | 10/20/1992 |
| 5073876 | Geophysical exploration using near surface structure corrections developed from common endpoint gather stacked traces Weathering corrections are determined from first arrival times of refraction stacked traces of common end point gathers. The refraction stacked traces are generated by selecting traces having receiver source offsets greater than the crossover distance and... | 12/17/1991 |
| 5051960 | Method of removing records of multiple reflection events from seismic data A method of removing multiple reflection events from seismic records is described. A shallow primary reflection event is used as a model for a deeper primary, and is distorted responsive to the predicted static correction to yield a model for the multiple... | 09/24/1991 |
| 5010976 | Characterization of the full elastic effect of the near surface on seismic waves A method of seismic exploration uses recordings from both surface receivers and buried sensors to determine the full elastic effect of the near surface layer on an applied seismic wave. The surface receivers are arranged relative to the seismic source loc... | 04/30/1991 |
| 4943950 | Method for migrating seismic data A method for properly migrating seismic data which has been elevation-static corrected. The method is comprised of assigning a zero (or very small) migration velocity for data located below a datum, yet above the original recording surface elevation. A be... | 07/24/1990 |
| 4750157 | Seismic vibrator earth impedance determination and compensation system An earth impedance determination and compensation system for use with a seismic vibrator utilizes output signals from accelerometers on the baseplate and reaction mass portions of the vibrator to create a signal indicative of the near-surface weathered ea... | 06/07/1988 |
| 4695984 | Method for establishing a surface consistent correction for the effects of the low velocity layer in seismic data processing A method useful in seismic data processing for correcting data for the effects of the low velocity layer. At least three sets of traces having common offsets are displayed as a function of centerpoint. From this, the first refraction arrival for each trac... | 09/22/1987 |
| 4581724 | Method for determining source and receiver statics in marine seismic exploration A method of determining source and receiver statics in a marine exploration area overlying a near surface low velocity layer employing a marine vessel for towing a seismic energy source and a marine detector cable, and an on-bottom seismic energy source a... | 04/08/1986 |
| 4415997 | Method for determining source and receiver statics in marine seismic exploration A method of determining source and receiver statics in a marine seismic exploration area overlying a near surface low velocity layer employing a seismic marine energy source, an on-bottom seismic detector cable for measuring seismic reflection signals, an... | 11/15/1983 |
| 4218766 | Method of seismic wave amplitude normalization Disclosed is a method of processing geological seismic reflection data to compensate for lateral variations in the attenuation effect which the weathered layer has on the reflected seismic energy waves as they approach an array of detectors at the surface... | 08/19/1980 |
| 4101867 | Method of determining weathering corrections in seismic operations The method of determining the magnitude of the differential static correction between adjacent records in seismic record processing, that involves the steps of: recording a first multi-trace record responsive to a first seismic wave generated at a first s... | 07/18/1978 |
| 4069471 | Method of determining weathering corrections in seismic record processing The method of determining the magnitude of the differential static correction between two selected adjacent receiver points D, E, in a linear seismic array, that involves the steps of: recording a first multi-trace record responsive to a first seismic wav... | 01/17/1978 |
