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| Number | Title | Issue Date |
| 7596055 | Attenuating unwanted signal using interferometry techniques A method to attenuate unwanted signals in seismic data using seismic interferometry techniques. In one implementation, seismograms may be converted into seismic interferograms. In the seismic interferogram domain, unwanted signals may be attenuated by various techni... | 09/29/2009 |
| 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 |
| 7382682 | Processing 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 |
| 7302419 | Dynamic operator identification system and methods A system and method for dynamically determining the demographic identity of an individual operating a set-top box, is disclosed which may include monitoring set top-box events for a plurality of set-top boxes, correlating set-top box events with demographic characte... | 11/27/2007 |
| 7260021 | Method 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 |
| 7242637 | Time-lapse seismic survey of a reservoir region A method of investigating a reservoir region in a subsurface formation by a time-lapse seismic survey. The subsurface formation comprises a further formation region adjacent to the reservoir region. Data are obtained from a time-lapse seismic survey and includes sei... | 07/10/2007 |
| 7236941 | Event invalidation method The invention concerns a computerized method of invalidating set-top box events. The method may include monitoring set-top box events, storing the set-top box events in a first array, calculating a first trend in the first array of set-top box events, invalidating t... | 06/26/2007 |
| 7218612 | Network synchronization A network arrangement uses a poll select control protocol and a loop back arrangement at each node for equalizing transmission delay from each node to a central station. Delays at each node can be adjusted to start timing in response to a broadcast signal indicating... | 05/15/2007 |
| 7197472 | Market data acquisition system A system and method for using inverse mathematical principles in the analysis of compatible datasets so that correlations and trends within and between said datasets can be uncovered. The present invention is tailored to the analysis of datasets that are extremely l... | 03/27/2007 |
| 7194421 | Content attribute impact invalidation method The invention concerns a method of determining the effect of content attributes on content ratings. The method may include obtaining content attributes, recording set-top box events as content is experienced without knowing individual-specific demographic informatio... | 03/20/2007 |
| 7139723 | Privacy compliant multiple dataset correlation system A system and method for using inverse mathematical principles in the analysis of compatible datasets so that correlations and trends within and between said datasets can be uncovered. The present invention is tailored to the analysis of datasets that are extremely l... | 11/21/2006 |
| 7116999 | Mobile communications receiving apparatus and method In a mobile communication receiving apparatus in which signals received on a plurality of receiving paths (branches) are combined by a combiner, correlation between noise signals contained in the signals received on respective ones of the branches is detected by a n... | 10/03/2006 |
| 7079449 | Methods 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 |
| 7079954 | Method for selective recording of SH waves using an array of sensors to filter out all non SH waves Selective recording of SH waves using an array of vector-summed sensors filters out all non-SH waves. ... | 07/18/2006 |
| 6950371 | Method for signal-to-noise ratio enhancement of seismic data using frequency dependent true relative amplitude noise attenuation A method for enhancing signal-to-noise (S/N) ratio of seismic data is presented. An ensemble of input traces is decomposed into a plurality of frequency bands of traces. Trace and signal power and then a maximum allowable signal-to-noise ratio are estimated for each... | 09/27/2005 |
| 6788619 | Concentrating seismic energy in a selected target point in an underground formation Providing a set of seismic sources in a focusing array to enable concentrating seismic energy in a selected target point (k) in an underground formation, by performing a standard seismic survey of the underground formation using a set of impulsive seismic sources an... | 09/07/2004 |
| 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 |
| 6731568 | Seismic 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 |
| 6614717 | Time-lapse seismic using nonlinear seismic imaging This invention relates to using elastically nonlinear seismic imaging methods, to identify the bypassed hydrocarbons and the movement of the reservoir fluids in the reservoir due to injection and production processes. Time-lapse seismic recording is used ... | 09/02/2003 |
| 6603707 | Method of reducing harmonic noise in vibroseis operations The invention relates to a vibroseis analysis method in which frequency-sweep signals (10) are emitted into a subsurface, the signals reflected on the substrata of such a subsurface (10, 20) are logged and the logged signals are processed, a method in whi... | 08/05/2003 |
| 6438069 | Method for time lapse reservoir monitoring A method of comparing multiple seismic survey data sets of a reservoir, is provided, wherein a first seismic survey data set is taken at a first time and a second seismic survey data set is taken at a second time, to detect changes in the reservoir betwee... | 08/20/2002 |
| 6246637 | Method and system for combining three component seismic data A system and method of processing seismic signals wherein seismic data resulting from a reflected seismic wave is received at a multi-component receiver. A mask trace is generated as a function of the seismic data received at the multi-component receiver,... | 06/12/2001 |
| 6049507 | Method and apparatus for correcting effects of ship motion in marine seismology measurements An apparatus and method for removing the distortion in marine seismic data resulting from the motion of the ship. The ship trails one or more seismic sources and receivers and moves forward at a known velocity. The seismic sources emit seismic waves that ... | 04/11/2000 |
| 6041018 | Method for correcting amplitude and phase differences between time-lapse seismic surveys The present invention relates to a time-lapse or 4-D seismic data processing method in which cross-correlation of trace information in a series of time-lapse seismic images is used to distinguish one source of noise from another source of noise. After a s... | 03/21/2000 |
| 6038197 | Efficient inversion of near singular geophysical signals A method for inverting a seismic signal, wherein an input seismic signal is represented as an input vector i(t) of length m+n-1, an output seismic signal is represented as an output vector o(t) of length m, and a finite impulse response filter is represen... | 03/14/2000 |
| 5995446 | Method of conducting drilling operations using vertical seismic profiles A method is described for providing improved seismic data to a driller to indicate position and spatial extent of a drilling target which may be up to several hundreds of feet ahead of a drill bit. In one embodiment, the method includes the steps of: surv... | 11/30/1999 |
| 5991238 | Weighted backus filter method of combining dual sensor traces A method for attenuating water column reverberations in a dual sensor seismic signal, whereby a pressure signal and a velocity signal are transformed from the time domain to the frequency domain, generating a transformed pressure signal and a transformed ... | 11/23/1999 |
| 5986974 | Method for geophysical processing and interpretation using seismic trace difference for analysis and display A method for identifying faults and stratigraphic features within seismic data without interpreter bias by processing seismic data to identify the minimum difference between seismic traces. Large values of difference are plotted as display attributes for ... | 11/16/1999 |
| 5970023 | Reducing aliasing artifacts in seismic data processing using sharpened (TAU-P-Q) transforms Marine seismic data sets are generally under-sampled spatially because of the relatively long listening times required in deep water. It is customary to use very long spreads in the field thereby enhancing aliasing and interference from coherent noise. A ... | 10/19/1999 |
| 5963507 | Method for improving the accuracy of ocean bottom reflectivity estimations using the inverse backus filter A method for determining ocean bottom reflectivities from dual sensor seismic data, whereby a first time windowed pressure signal and a first windowed velocity signal are summed to generate a first summed signal, and a second time windowed pressure signal... | 10/05/1999 |
| 5901112 | Signal energy enhancement for seismic exploration Harmonics, which appear with seismic reflection signals and are responsive to actual vibrations of a land-vibrator for petroleum exploration, are effectively utilized in pulse compression techniques by applying a correlation operator (CO) signal represent... | 05/04/1999 |
| 5850622 | Time-frequency processing and analysis of seismic data using very short-time fourier transforms The present invention relates generally to method of seismic data processing which provides a superior method of removing or attenuating some forms of seismic noise and can also be used as a basis for seismic attribute analysis and automatic trace editing... | 12/15/1998 |
| 5825716 | Method of reverberation removal from seismic data and removal of dual sensor coupling errors A method for eliminating the influence of multiple reflections in seismic data by determining an up going and down going vector wave-field from the vector wave-field, determining a product of the free surface refection coefficient and the down going vecto... | 10/20/1998 |
| 5771203 | Seismic prospection method with application of a self-deconvoluted prediction error filter The invention relates to a seismic prospection method in which a seismic disturbance is generated in the sub-soil and sensors are used to pick up seismic data, the seismic data being processed to deduce useful information concerning the geology of the sub... | 06/23/1998 |
| 5719822 | Seismic data radon dip moveout method A method of processing seismic signal data that uses a special Radon transform for dip moveout (DMO) including the steps of applying conventional pre-DMO steps to the traces, applying a special Radon DMO transform to the traces to obtain a post-DMO sectio... | 02/17/1998 |
| 5715213 | High fidelity vibratory source seismic method using a plurality of vibrator sources A method for recording and pre-processing high fidelity vibratory seismic data includes the steps of measuring the motion of the vibrator which is related to the vibrator applied force times a transfer function of minimum phase, causal, linear system rela... | 02/03/1998 |
| 5703833 | One step inversion/separation scheme using a plurality of vibrator sources A method for generating, recording and pre-processing high fidelity vibratory seismic data in a system that uses a plurality of vibratory sources includes the steps of measuring the motion of each of the vibrators, determining a ratio by dividing the vibr... | 12/30/1997 |
| 5638338 | Seismic processing apparatus and method A method of deconvolving surface measured seismic signals reflected from a sub-surface sequence of geological formations, in which the sub-surface sequence of geological formations contains an areally stable acoustic impedance sequence. An inverse filter ... | 06/10/1997 |
| 5521881 | Method of processing seismic data having multiple reflection noise Disclosed is a method of processing seismic data containing multiples, which method generally includes as a step, determining the two-way travel time to a suspected multiple generating event. This method includes the application of a normal moveout operat... | 05/28/1996 |
| 5481503 | Apparatus for and method of adaptively processing sonar data The invention discloses an apparatus for and a method of adaptively processing a sonar power spectrum for improving the display of narrowband line structure characteristic of a target in a background of broadband interference which is rippled due to multi... | 01/02/1996 |
