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| Number | Title | Issue Date |
| 8125848 | Acoustic logging-while-drilling tools having a hexapole source configuration and associated logging methods Multipole acoustic logging-while-drilling (LWD) tools and associated methods are disclosed herein. In some embodiments, the disclosed acoustic LWD tool comprises a transmitter array and at least one receiver array. The transmitter array generates acoustic waves with... | 02/28/2012 |
| 8116168 | Hybrid one-way and full-way wave equation migration A migration method using hybrid one-way and full-way (HOF) wave equation propagation. The HOF method extrapolates seismic wavefields in less complex media with a one-way wave equation propagator and extrapolates seismic wavefields in extremely complex media with a f... | 02/14/2012 |
| 7894299 | Converted mode seismic survey design Method for designing a converted mode (PS or SP) seismic survey to accomplish specified vertical and lateral resolution objectives at target depth. An equation (181) is provided for determining the minimum bandwidth required for a desired vertical resolution ... | 02/22/2011 |
| 7660201 | Autonomous seismic data acquisition unit A method, apparatus and system for acquiring land seismic data includes acquiring seismic data with a first autonomous seismic data acquisition unit and a second autonomous seismic data acquisition unit wherein each acquisition unit comprises a plurality of digitall... | 02/09/2010 |
| 7626887 | Displacement field calculation Implementations of various technologies for a method for processing seismic data. In one implementation, the method includes (a) selecting a first trace from a first seismic data set and a second trace from a second seismic data set; (b) extracting one or more featu... | 12/01/2009 |
| 7609585 | Method for sub-salt migration velocity analysis A method for interpreting seismic data below a salt layer includes depth migrating the seismic data to a bottom of the salt layer. The migrating including generating an initial model of velocities below the salt layer. The initial model is scaled by a plurality of s... | 10/27/2009 |
| 7436735 | Method 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 |
| 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 |
| 7400553 | One-return wave equation migration A one-return wave equation migration is used to extrapolate both down-going and up-going waves. Followed by a properly designed imaging condition, the partial image contributed form turning waves is correctly reconstructed. Numerical examples show that this method c... | 07/15/2008 |
| 7397728 | Method for processing a record of seismic traces An apparatus and method for processing a record of seismic traces. The method includes receiving the record of seismic traces in a time-offset domain, transforming the record of seismic traces to a tau-p domain, applying a zero offset inverse Q algorithm to the reco... | 07/08/2008 |
| 7388808 | Method for depth migrating seismic data using pre-stack time migration, demigration, and post-stack depth migration A method is disclosed for depth migrating seismic data. The method includes pre-stack time migrating the seismic data to form a stacked, time migrated image. The stacked, time migrated image is demigrated, and post-stack depth migration is then performed on the demi... | 06/17/2008 |
| 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 gathers in an offset-time domain without correcting the data for normal mo... | 04/29/2008 |
| 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 |
| 7355923 | Seismic 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 |
| 7345951 | Method of determining specular information after prestack seismic imaging Method of determining the specular source/receiver pairs associated with seismic images produced from a transformation of multi-offset seismic wave records as a function of time in the depth domain. When using a prestack depth migration algorithm of Kirchhoff... | 03/18/2008 |
| 7321526 | Method and apparatus for water velocity decomposition The present invention provides a method for analyzing traces collected along a plurality of adjacent sail lines in a marine seismic survey area. The method comprises selecting a plurality of trace groups, at least one trace in each group sharing a common midpoint wi... | 01/22/2008 |
| 7257492 | Handling 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 |
| 7196969 | Three-dimensional two-way acoustic wave equation pre-stack imaging systems and methods A system and method for pre-stack imaging system that includes multiple processors, with each processor configured to perform two-way wave equation-based forward wave propagation of a source event to obtain a source wave field using high order spatial finite differe... | 03/27/2007 |
| 7167414 | Amplitude preserving prestack migration method A method is disclosed for amplitude preserving Kirchhoff time migration. The method includes calculating estimates of the geometrical spreading terms using a constant velocity approximation. Takeoff and emergence angles are accurately calculated based on a model of ... | 01/23/2007 |
| 7123543 | Method for seismic exploration utilizing motion sensor and pressure sensor data A method is disclosed for deghosting seismic data. The data include measurements of a vertical component of particle motion and pressure. The measurements are substantially collocated and made at a plurality of spaced apart positions. The method includes transformin... | 10/17/2006 |
| 7099417 | Trace video filtering using wavelet de-noising techniques A filter that includes an analyzer, thresholding circuit, and synthesizer. The analyzer generates a low-frequency component signal and a high-frequency component signal from an input signal. The thresholding circuit generates a processed high-frequency signal from t... | 08/29/2006 |
| 7085195 | Method 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 |
| 7065004 | Horizon-based residual depth migration velocity analysis A method is disclosed for processing seismic data. The method includes prestack depth migrating the seismic data to generate common image gathers using an initial velocity-depth model. Horizons in the migrated seismic data are selected. Residual migration velocity a... | 06/20/2006 |
| 7058514 | Method for attenuating noise in seismic data using complex trace diversity filter A method is disclosed for attenuating noise in seismic data. The method includes calculating a trace envelope for at least part of at least one seismic trace, generating a filtered envelope from the trace envelope, and transforming the filtered envelope to a filtere... | 06/06/2006 |
| 7046581 | Well-to-well tomography A method of obtaining a spatial model of a property of part of a subsurface formation located between underground seismic receivers in which at least two sets of pairs of seismic receivers are utilized and one pair of receivers is used to record a signal from a seim... | 05/16/2006 |
| 7039525 | Method for seismic migration using explicit depth extrapolation operators with dynamically variable operator length Explicit depth extrapolation operators are constructed with variable operator lengths depending on maximum dip angle, accuracy condition, and wavenumber. Operator tables are then constructed using the explicit depth extrapolation operators. In a further embodiment, ... | 05/02/2006 |
| 7039526 | Method for downward extrapolation of pre-stack seismic data A set of pre-stack seismic data is downward extrapolated, by first determining a migration interval in the seismic data set. A maximum error criterion is selected for the migration interval. A maximum relative error in phase calculated as a function of frequency, pr... | 05/02/2006 |
| 7024021 | Method for performing stratigraphically-based seed detection in a 3-D seismic data volume The invention is a method for performing a stratigraphically-based seed detection in a 3-D seismic data volume. The method incorporates criteria that honor the layered nature of the subsurface so that the resulting seismic objects are stratigraphically reasonable. T... | 04/04/2006 |
| 7014296 | Printhead receivingly engageble within a printer A replaceable elongate pagewidth inkjet printhead for a printer. The printhead has at least one inlet port in an external surface in fluid communication with the nozzles and electrical connectors for power and control signals to the ejection actuators. The pr... | 03/21/2006 |
| 6985405 | Method for stable estimation of anisotropic parameters for P-wave prestack imaging A method is disclosed for determining interval anisotropic parameters. The method includes determining normal moveout (NMO) velocities and effective anelliptical parameters from seismic data traces. The NMO velocities are processed to obtain interval NMO velocities.... | 01/10/2006 |
| 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 |
| 6971896 | Flex strips for high frequency connectors A high frequency connector utilizes flex strip signal/reference conductor pairs extending in channels formed in a dielectric connector body between terminations at connector ends. The flex strips are formed as signal and reference conductor traces separated by a fle... | 12/06/2005 |
| 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 filtered sonic data; and beamforming the filtered and migrated sonic... | 10/18/2005 |
| 6944094 | High 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 |
| 6937659 | Apparatus and method for compressing video information A method and apparatus is disclosed for efficiently encoding data representing a video image, thereby reducing the amount of data that must be transferred to a decoder. The method includes transforming data sets utilizing a tensor product wavelet transform which is ... | 08/30/2005 |
| 6920084 | Offset transformation to zero dip that preserves angle of incidence A method and apparatus for compensating acquired seismic data for the presence of dipping events are disclosed. The method includes migrating the acquired, unstacked seismic data; and spatially mapping the migrated seismic data to correct their respective offsets wh... | 07/19/2005 |
| 6917564 | Method of processing seismic data A method of processing seismic data, for example surface seismic data such as multi-component OBC (Ocean Bottom Cable) seismic data, comprises using vertical seismic profile (VSP) seismic data to determine a model of the relationship between depth within the earth a... | 07/12/2005 |
| 6898147 | 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 selected time ... | 05/24/2005 |
| 6898148 | Multi-step receiver-motion compensation The present invention provides methods to be used in seismic data processing to address problems encountered during data acquisition. The present invention provides a multi-step process to reduce aliasing of seismic data along time slices. ... | 05/24/2005 |
| 6826501 | Method and apparatus for estimating water bottom reflection time difference The present invention provides a method for reducing water bottom reflection time differences. The method includes selecting a plurality of trace groups, each trace having an offset from a midpoint and a water bottom reflection time. The method also includes determi... | 11/30/2004 |
