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| Number | Title | Issue Date |
| 6760667 | Method for generating P-S and S-S seismic data and attributes from P-P seismic data A method for generating P-S or S—S seismic data from P—P AVO data in P—P travel time for a geographic area includes obtaining a plurality of amplitude and angle of incidence pairs of P—P AVO data. The plurality of amplitude and angle of incidence pairs of Pâ... | 07/06/2004 |
| 6757216 | Method for post processing compensation of amplitude for misaligned and misstacked offset seismic data A method for assessing the suitability of seismic data for quantitative amplitude analysis, where the concern is excessive residual normal moveout (RNMO). The invention uses a near offset stack and a far offset stack, the time difference between the two, a mute patt... | 06/29/2004 |
| 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 plurality of time shifts. An initial time-shift volume and a maximum corre... | 06/29/2004 |
| 6757614 | Seismic signal processing method and apparatus for generating correlation spectral volumes to determine geologic features A seismic signal processing method will analyze a resultant set of seismic data, generated in response to a seismic operation performed on a particular portion of an Earth formation, for the purpose of determining a set of geologic characteristics of the particular ... | 06/29/2004 |
| 6757615 | Method for automated horizon transfer and alignment through the application of time-shift volumes Seismic horizons are transferred between two three-dimensional seismic data volumes which cover the same area. The seismic data volumes are time-aligned to generate a time-shift volume. A seismic horizon is selected and the time-shift volume is applied to the seismi... | 06/29/2004 |
| 6754591 | Method for processing seismic traces to provide seismic data with enhanced signal-to-noise ratio A method for processing seismic traces to provide enhanced signal-to-noise ratio in seismic data is provided. A seismic survey of traces is obtained which has been collected over an areal region containing a grid of nodes. A rolling supergather aperture is used to s... | 06/22/2004 |
| 6754590 | Seismic surveying method An improved method of acquiring seismic data using a plurality of vibratory seismic sources including the steps of deploying a seismic sensor deploying a plurality of vibratory seismic sources at different source points; simultaneously actuating the seismic sources;... | 06/22/2004 |
| 6751558 | Method and process for prediction of subsurface fluid and rock pressures in the earth A method of determination of fluid pressures in a subsurface region of the earth uses seismic velocities and calibrations relating the seismic velocities to the effective stress on the subsurface sediments. The seismic velocities may be keyed to defined seismic hori... | 06/15/2004 |
| 6748329 | Acoustic signal processing method using array coherency A system and method is provided for characterizing earth formations. In one embodiment, the method includes passing a logging tool through a borehole and repeatedly: (a) triggering an acoustic wave generator; (b) recording acoustic waveforms received by receivers in... | 06/08/2004 |
| 6747915 | Seismic imaging a subsurface formation A method of seismic imaging a subsurface formation using an array of seismic sources and an array of seismic receivers located subsurface, wherein there is a complex transmission medium between the two sets by creating a virtual source at a selected receiver within ... | 06/08/2004 |
| 6747913 | Method and system for deghosting In one embodiment the invention comprises a method for receiving an acoustic wavefield beneath the surface of the water in which at least a portion of an acoustic wavefield is received at a first position, at least a portion of an acoustic wavefield is received at a... | 06/08/2004 |
| 6748330 | Method and apparatus for anisotropic vector plane wave decomposition for 3D vertical seismic profile data A wavefield separation method and apparatus for 3D VSP data, which handles arbitrary 3D source and receiver geometries, and common shot 3C data oriented to North, East and Vertical geographical coordinates and makes use of anisotropic medium properties at the downho... | 06/08/2004 |
| 6738715 | Method for attenuating noise in seismic data The invention is a method for attenuating noise in seismic data traces, in which at least a portion of the noise is noncoherent in the common-shot domain but coherent in the common-receiver domain, the coherent noise having a move-out velocity different from the mov... | 05/18/2004 |
| 6735526 | Method of combining directional seismic attributes using a supervised learning approach A method of combining directional seismic attributes using a supervised learning approach which may include extracting seismic information from acquired data in a direction along the spatial direction of a body of interest. The method is applicable both to onshore a... | 05/11/2004 |
| 6735527 | 3-D prestack/poststack multiple prediction System and method for analyzing seismic data from a formation. Stacked seismic data are provided, including a plurality of stack traces, e.g., by collecting seismic data from source and receiver locations and stacking the collected seismic data to produce the stacke... | 05/11/2004 |
| 6725163 | Method for processing seismic measured data with a neuronal network The invention relates to a method for processing a 3-D measurement data set provided with seismic attributes, by means of a neural network, whereby a self-organizing map is trained with selected training data, and the data to be examined are classified according to ... | 04/20/2004 |
| 6725174 | Edge-preserving enhancement of seismic images by nonlinear anisotropic diffusion A method for preserving edges in an image data set utilizing a modified anisotropic diffusion technique which can be applied multiple times to the image data to improve edge definition. The modified anisotropic diffusion technique may be applied to a filtered data s... | 04/20/2004 |
| 6721669 | Method and device for measuring the volumetric flow of a fluid The present invention provides a flow meter whereby movement of fluid causes screw spindles or other movable elements to rotate and generate electronic pulses. The invention compensates for non-linearity in the relationship between the flow rate and the number of pu... | 04/13/2004 |
| 6714873 | System and method for estimating subsurface principal stresses from seismic reflection data A method and system is described for estimating stress characteristics from seismic data. The method includes receiving seismic data acquired over a region, receiving properties of rock at a location within the region, and estimating one or more stress characteristi... | 03/30/2004 |
| 6704657 | Method and apparatus for determining blaster detonation time and first arrival time of seismic wave The present invention comprises an apparatus and a method for measuring the first arrival time of seismic waves from detonation in seismic explorations, comprising a or several detectors for measuring seismic waves and converting them into electrical sign... | 03/09/2004 |
| 6694263 | Method for facilitating monitoring, in the course of time, of the evolution of an underground zone by compared analysis of various seismic record sets The present invention relates to a method for facilitating monitoring, in the course of time, of the evolution of an underground zone by compared analysis of a certain number n of seismic record sets obtained respectively after n successive 3D seismic sur... | 02/17/2004 |
| 6691038 | Active separation tracking and positioning system for towed seismic arrays A method and apparatus comprising an active control system for a towed seismic streamer array that enables any relative positional control of any number of towed seismic streamers. The streamer positions are controlled horizontally and vertically using ac... | 02/10/2004 |
| 6691060 | Method and device for monitoring wheel speeds A method is described for monitoring wheel speeds, having the following steps: determining the wheel speeds, determining the wheel having the maximum wheel speed, determining the wheel having the minimum wheel speed, determining the differential speed bet... | 02/10/2004 |
| 6691075 | Method for modeling seismic acquisition footprints A model seismic image of a subsurface seismic reflector is constructed, wherein a set of source and receiver pairs is located, and a subsurface velocity function is determined. Specular reflection points are determined on the subsurface seismic reflector ... | 02/10/2004 |
| 6687617 | Method and system for migration of seismic data A method of migrating seismic data is provided. The seismic data has associated therewith a wavefield at a first level. The method comprises extrapolating the wavefield from the first level to a second level; correcting the extrapolated wavefield; computi... | 02/03/2004 |
| 6687618 | Typing picks to horizons in migration velocity analysis A seismic velocity analysis method includes tying velocity parameter values such as residual velocity values to geological horizons (reflectors) within a seismic exploration volume. Common image gathers (CIGs) such a common reflection point (CRP) gathers ... | 02/03/2004 |
| 6687619 | Method of using cascaded sweeps for source coding and harmonic cancellation A method of seismic surveying using one or more vibrational seismic energy sources activated by sweep signals. The highest order harmonic that has sufficient strength to cause significant harmonic distortion of a sweep segment is determined. A number of s... | 02/03/2004 |
| 6687659 | Method and apparatus for absorbing boundary conditions in numerical finite-difference acoustic applications A hybrid approach is disclosed for implementing highly efficient absorbing boundary conditions in three dimensional (3D) finite difference (FD) acoustic applications such as post-stack and pre-stack seismic migration, and forward modeling. The "Perfectly ... | 02/03/2004 |
| 6681184 | System for estimating azimuthal variations in seismic data The invention comprises a system for processing seismic data to estimate time shift resulting from velocity anisotropy in the earth's subsurface. A gather of seismic data traces is formed and selected seismic data traces included in said gather within sel... | 01/20/2004 |
| 6681185 | Method of seismic signal processing A method of seismic analysis is disclosed for determining geopressures or seismic velocities or other formation attributes. A frequency related attribute is determined from seismic data by analysis of the frequency content of one or more signal traces. Ge... | 01/20/2004 |
| 6681199 | Peak time detecting apparatus and method A product-sum operation portion for performing a product-sum operation (wavelet transformation) with respect to an input time-series signal by using as a base of integral a complex function in which the imaginary number portion is π/2 shifted in phase fr... | 01/20/2004 |
| 6678207 | Trapped water bottom multiple and peg-leg multiple suppression for ocean bottom seismic data The invention is a method for removing trapped water bottom multiples, receiver side peg-leg multiples, and source side peg-leg multiples from dual sensor OBC data, where the data includes both pressure signals and velocity signals. The pressure and veloc... | 01/13/2004 |
| 6675102 | Method of processing seismic geophysical data to produce time, structure, volumes The method of the present invention relates to the field of seismic data interpretation for the purpose of finding natural occurrences of oil and/or gas in a geophysical formation. The invention relates to a method of processing seismic geophysical data t... | 01/06/2004 |
| 6665617 | Ground analyzing system and recording medium recording analysis program used therefor Two acceleration detectors (11A and 11B) are dispose at a distance L from each other on the ground. A vibration exciter (15) vibrates the surface of the ground in the vertical direction to generate surface waves. A measuring instrument (12) includes a sei... | 12/16/2003 |
| 6665618 | Seismic survey design technique An improved system for designing seismic surveys wherein the density and areal size of the seismic survey components (e.g., sources or receivers) are selected based on a plurality of calculated templates of the components that are generated using a mappin... | 12/16/2003 |
| 6664788 | Nonlinear electroseismic exploration A method for seismic exploration using nonlinear conversions between electromagnetic and seismic energy, with particular attention to the electromagnetic source waveform used. According to the invention, seismic returns from a source waveform are correlat... | 12/16/2003 |
| 6662111 | Method for analyzing reflection curvature in seismic data volumes A method of calculating reflection curvature in a seismic data volume wherein an apparent dip value is calculated in a first direction to generate a first apparent dip volume. A horizontal gradient is calculated in the first direction in the first apparen... | 12/09/2003 |
| 6661737 | Acoustic logging tool having programmable source waveforms An acoustic tool that provides a programmable source waveform is disclosed. Numerous advantages may be achieved from the configurability of the source waveform. Notably, acoustic logs at multiple frequencies may be acquired with a single pass. The wavefor... | 12/09/2003 |
| 6662112 | Method for classifying AVO data using an interpreter-trained neural network AVO anomalies are classified in near-offset and far-offset seismic data volumes, by first calculating a plurality of initial AVO seismic attributes representative of the offset seismic data volumes. A probabilistic neural network is constructed from the c... | 12/09/2003 |
| 6654693 | Angle dependent surface multiple attenuation for two-component marine bottom sensor data A method of processing data that uses an angle dependent filter from two-component sensor data allows for attenuation of free surface multiples. Typically, the sensors that are used to produce two-component ocean bottom sensor data are hydrophones and geo... | 11/25/2003 |
