| Patent application number | Description | Published |
|---|
| 20080225641 | Multi-Component Seismic Data Processing - There is described a method of moveout or velocity analysis of seismic signals using the steps of obtaining such signals | 09-18-2008 |
| 20080275650 | METHOD OF AND APPARATUS FOR PROCESSING SEISMIC DATA - A method of processing seismic data that includes including first and second modes of seismic energy where the second mode has been generated by partial mode conversion of the first mode at a boundary face of a layer of the seabed includes the step of cross-correlating a trace acquired at a receiver and including events corresponding to the first mode with a trace acquired at the same receiver and including events corresponding to the second mode. An event in the cross-correlated data that corresponds to partial mode conversion is identified, and the amplitude of this event is normalized, for example relative to the amplitude of the peak in the cross-correlogram at zero time delay. Information about the effects of the static shift produced by the layer and/or about vector infidelity can be arrived from normalized cross-correlograms for receivers in a receiver array. | 11-06-2008 |
| 20090043545 | Processing Data Representing Energy Propagating Through A Medium - The present invention relates to a method of processing data representing energy propagating through a medium (e.g., acoustic, elastic or electromagnetic energy) and describes an efficient and flexible e approach to forward modeling and inversion of such energy for a given medium. The representation theorem for the wave-equation is used, in combination with time-reversal invariance and reciprocity, to express the Green's function between two points in the interior of the model as an integral over the response in those points due to sources regularly distributed on a surface surrounding the medium and the points. | 02-12-2009 |
| 20090103677 | Classification method for sedimentary rocks - A method of determining a parameter of interest of reservoir rock formation is described using the steps of measuring an x-ray attenuation or absorption distribution of a sample of said rock formation, identifying the mineral phase part of said distribution, and subdividing the mineral phase part of said distribution to derive classification or rock type information of said sample. | 04-23-2009 |
| 20100067328 | INTERFEROMETRIC DIRECTIONAL BALANCING - A method for estimating seismic data from sources of noise in the earth. The method includes calculating a first set of Green's functions between a first seismic receiver and each seismic receiver of an array of seismic receivers using interferometry. The array of seismic receivers is disposed around the first seismic receiver, and the first seismic receiver is part of the array of seismic receivers. The method also includes calculating one or more correction factors to correct the first set of Green's functions and calculating a second set of Green's functions between each seismic receiver of the array and a second seismic receiver using interferometry. Here, the first seismic receiver is disposed at a predetermined distance away from the second seismic receiver. Also, the first set and the second set of Green's functions are biased due to non-identical strengths of the sources of noise. The method then applies the correction factors to the second set of Green's functions to create a set of unbiased Green's functions between each seismic receiver of the array and the second seismic receiver. | 03-18-2010 |
| 20100074051 | REMOVING NON-PHYSICAL WAVEFIELDS FROM INTERFEROMETRIC GREEN'S FUNCTIONS - A method for estimating seismic data from sources of noise in the earth surrounding a first seismic receiver and a second seismic receiver. The method includes calculating a Green's function G′(X | 03-25-2010 |
| 20110044132 | Removing Ground-Roll from Geophysical Data using Source-Receiver Interferometry - A method for processing geophysical data. The method includes applying a first interferometry on an estimate of a direct ground roll between a receiver location and one or more boundary source locations and an estimate of a direct ground roll between one or more boundary receiver locations and each boundary source location to generate an interferometric estimate of a direct ground roll between the receiver location and each boundary receiver location. The method then includes applying a second interferometry on geophysical data between the source location and each boundary receiver location and the interferometric estimate of the direct ground roll between the receiver location and each boundary receiver location to generate an interferometric estimate of a direct and scattered ground roll between the source location and the receiver location. After applying the second interferometry, the method then includes removing the interferometric estimate of the direct and scattered ground roll between the source location and the receiver location from geophysical data acquired at the receiver location due to a source at the source. | 02-24-2011 |
| 20110046886 | Removing Ground-Roll from Geophysical Data - A method for processing geophysical data. The method includes generating a model from geophysical data acquired at a receiver location and one or more boundary receiver locations. After generating the model, the method applies a forward modeling algorithm using information from the model to generate a modeled estimate of a direct ground roll between the receiver location and each boundary receiver location. The method then estimates a ground roll between a source location and each boundary receiver location. Using the modeled estimate of a direct ground roll between the receiver location and each boundary receiver location and the estimate of the ground roll between a source location and each boundary receiver location, the method applies interferometry between the estimate of the ground roll between the source location and each boundary receiver location and the modeled estimate of the direct ground roll between the receiver location and each boundary receiver location to generate an interferometric estimate of a ground roll between the source location and the receiver location. The method then removes the interferometric estimate of the ground roll between the source location and the receiver location from geophysical data acquired at the receiver location due to a source at the source location. | 02-24-2011 |
