Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7676327 | Method for optimal wave field separation A technique for decomposing a recorded wave field represented in a set of multicomponent, marine seismic data centers around a computer-implemented method including: estimating the statistics of the noise terms in each one of a predetermined group of seismic measure... | 03/09/2010 |
| 7667464 | Time segmentation of frequencies in controlled source electromagnetic (CSEM) applications A method for measuring a resistivity of a subsurface formation that includes transmitting continuously a signal at a first fundamental frequency at full power for a first period of time within a single window of time causing electromagnetic energy to propagate in th... | 02/23/2010 |
| 7660202 | PP/PS event matching (registration) A method for generating an average gamma factor for recorded PS data and recorded PP data. The method includes mapping one or more arrival times of the recorded PS data onto one or more expected arrival times of the recorded PP data using an estimated average gamma ... | 02/09/2010 |
| 7659724 | Surveying method using an arrangement of plural signal sources The survey technique for use in a marine environment to survey a subterranean structure includes providing an arrangement of plural signal sources in a body of water to produce corresponding signals. The signals of the signal sources in the arrangement are set to ca... | 02/09/2010 |
| 7657391 | Electromagnetically detecting thin resistive bodies in shallow water and terrestrial environments A technique includes performing first electromagnetic field measurements to obtain a first set of data and performing second electromagnetic field measurements to obtain a second set of data. The first set of data is relatively sensitive to an effect caused by an ai... | 02/02/2010 |
| 7656746 | Rational motion compensated seabed seismic sensors and methods of use in seabed seismic data acquisition Apparatus and methods for acquiring seismic data using a seabed seismic data cable positioned on a seabed are described, including correcting for the effect of one or more sensor non-linear motions, which improves accuracy of seismic data. One or multiple non-linear... | 02/02/2010 |
| 7642784 | Electromagnetic survey system with multiple sources Multiple sources are provided for a transmitter cable for use in electromagnetic surveying. The transmitter cable includes a dipole antenna comprising a pair of spaced apart electrodes mounted on their respective cables. Two antennas may be powered from each source.... | 01/05/2010 |
| 7616525 | Method and apparatus for attenuation wind noise in seismic data A method and apparatus for use in seismic prospecting are disclosed. The method includes: attenuating coherent noise in a seismic data set generated from a sweep signal; and correlating the coherent noise-attenuated seismic data set to the sweep signal. The apparatu... | 11/10/2009 |
| 7602670 | Method of seismic surveying A method enables the time required to complete a seismic survey and the noises recorded in the seismic data to be reduced. One aspect of the method includes actuating a first vibrator group to start a first sweep at time T0; and a second vibrator group to sta... | 10/13/2009 |
| 7599798 | Migrating composite seismic response data to produce a representation of a seismic volume A subterranean structure is characterized using composite seismic response data received from a plurality of sources. Phase encoding is applied to the data in which phase shifts are selected based on frequency variation of noise terms. The phase-encoded data is then... | 10/06/2009 |
| 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 |
| 7586811 | Subsalt velocity model building Method for building a subsalt velocity model. In one implementation, the method may include determining a velocity of a sedimentary area surrounding a salt body, determining an initial velocity of a subsalt sedimentary area disposed below the salt body by interpolat... | 09/08/2009 |
| 7586810 | Directional de-signature for seismic signals The present invention provides a method and apparatus for directional de-signature of a seismic signal. The method includes forming a plurality of far-field signatures representative of a plurality of seismic signals having a plurality of take-off angles, associatin... | 09/08/2009 |
| 7574303 | Seismogram correction for absorption effects Correcting seismograms to compensate for absorption or dissipative effects that occur in the earth. In one implementation, a ratio of traveltime (t) to absorption parameter (Q) may be computed for each seismogram. The ratio may be referred to as R. Further, the rati... | 08/11/2009 |
| 7558154 | Method of and apparatus for processing seismic data A method determining a calibration filter to calibrate a first component of multi-component seismic data relative to a second component of the seismic data comprises determining the calibration filter from a portion of the seismic data that contains only events aris... | 07/07/2009 |
| 7518951 | Systems and methods for seismic streamer positioning Systems and methods for determining position of one or more seismic streamers are disclosed. One system embodiment includes a seismic streamer towed by a towing vessel at a first depth; at least one positioning streamer towed by the towing vessel at a second depth d... | 04/14/2009 |
| 7505360 | Fast 3-D surface multiple prediction A method and apparatus for predicting a plurality of surface multiples for a plurality of traces in a record of seismic data. In one embodiment, the method includes providing a plurality of target traces at a nominal offset and a nominal azimuth; selecting a plurali... | 03/17/2009 |
| 7504829 | Methods and apparatus for subsurface geophysical exploration using joint inversion of steady-state and transient data Methods and apparatus are provided for controlled source electromagnetic surveying. In particular, a time-varying electromagnetic signal is transmitted at a first location, and an electromagnetic signal responsive to the transmitted signal is received at a second lo... | 03/17/2009 |
| 7499374 | Determining acceptability of sensor locations used to perform a seismic survey Method for determining acceptability of sensor locations used to perform a seismic survey. In one implementation, the method includes obtaining a first set of reference data, generating a first output trace from a second set of reference data estimated from the firs... | 03/03/2009 |
| 7499373 | Apparatus and methods for seismic streamer positioning Apparatus, systems and methods for connecting two seismic streamers are disclosed that enable two streamers to be towed in a desired arrangement. One apparatus comprises an elongate member having a first portion and a second portion, and an orientation member connec... | 03/03/2009 |
| 7492665 | Seismic data acquisition and source-side derivatives generation and application The technologies described herein include systems and methods for encoding/decoding seismic sources and responses, generating and using of source-side derivatives while also generating and using the conventional source response. Sources in an array may be encoded su... | 02/17/2009 |
| 7489590 | Method and apparatus for source and receiver side wave field separation The present invention provides a method and apparatus for wave field separation. The method includes accessing a marine seismic data set acquired by a plurality of receivers deployed at a first plurality of depths in response to a plurality of acoustic signals provi... | 02/10/2009 |
| 7480204 | Seismic data processing Implementations of various technologies for processing seismic data. In one implementation, the seismic data may be processed by creating a fictitious source-receiver line connecting a source with a receiver location of interest, projecting one or more receiver loca... | 01/20/2009 |
| 7474996 | Method of processing geophysical data A method of processing geophysical data including determining the azimuth of a mirror symmetry plane within the earth from the geophysical data having sets of geophysical data acquired with different source-receiver azimuths. The data are processed to determine attr... | 01/06/2009 |
| 7471089 | Electrode array for marine electric and magnetic field measurements having first and second sets of electrodes connected to respective first and second cables An electrode array for electric and magnetic measurements in a marine environment includes a first set of electrodes connected to a first cable, wherein the first set of electrodes and the first cable are configured to sink to a sea floor in the marine environment; ... | 12/30/2008 |
| 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 |
| 7466632 | Method and apparatus for positioning a center of a seismic source The present invention provides a method and apparatus for positioning a center of a seismic source. The method includes determining a desired center-of-source of the seismic source and selecting one of a first and a second plurality of guns to form the seismic sourc... | 12/16/2008 |
| 7450469 | Water velocity corrections Various technologies for a method for processing seismic data. In one implementation, the method includes cross-correlating seismic traces having midpoint locations, offsets and azimuths within a predetermined range but from different sequences; and selecting a peak... | 11/11/2008 |
| 7450467 | Apparatus and methods for seismic streamer positioning Systems and methods for positioning seismic streamers are disclosed that enable two or more streamers to be positioned in over/under configuration. One system comprises first and second pluralities of remotely controllable birds mounted on or inline in first and sec... | 11/11/2008 |
| 7447238 | Method for compensating for internal delays within each node and transmission delays between the nodes A method for compensating for one or more transmission delays between a multiplexer, a first node and a second node. In one embodiment, the method includes synchronizing a first real time clock of the multiplexer as the real time clock of the first node and as the r... | 11/04/2008 |
| 7447115 | Processing seismic data using interferometry techniques Method for processing seismic data. In one implementation, the method includes converting a common midpoint (CMP) gather of seismograms into one or more interferogram common midpoint (ICMP) gathers, generating a semblance spectrum for each ICMP gather, stacking the ... | 11/04/2008 |
| 7443766 | Sensor assembly A sensor assembly includes a seismic sensor element and a shell. The shell at least partially surrounds the sensor element to shield the sensor element from a magnetic field that is generated outside of the shell. ... | 10/28/2008 |
| 7433264 | Methods and systems for determination of vertical correction of observed reflection seismic signals Methods and systems for determining position of seismic sources and receivers are disclosed. Signals received by a first antenna are processed to determine its 3D coordinate position. Signals received by the first antenna and a second antenna are combined and proces... | 10/07/2008 |
| 7430474 | Removing sea surface-related electromagnetic fields in performing an electromagnetic survey To perform surveying of a subterranean structure, electromagnetic (EM) wavefields traveling in opposite directions are determined. A relationship is defined among the EM wavefields, where the EM wavefields include a first set of EM wavefields in a first state in whi... | 09/30/2008 |
| 7426439 | Method and apparatus for marine seismic data acquisition The present invention provides a method and apparatus for seismic data acquisition. One embodiment of the method includes accessing data acquired by at least two particle motion sensors. The data includes a seismic signal and a noise signal and the at least two part... | 09/16/2008 |
| 7421346 | Processing seismic data A method of matching the impulse response of a hydrophone and the impulse of a geophone accelerometer comprises performing a calculus operation upon the response of one of the hydrophone and the accelerometer. A filter is then derived from the output of the calculus... | 09/02/2008 |
| 7415936 | Active steering for marine sources A seismic survey system includes a winch having a winch cable coupleable to a source array towable between two deflected lead-ins, a positioning system for determining a current position of the source array and a controller for adjusting the winch to modify the curr... | 08/26/2008 |
| 7418349 | 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-correlat... | 08/26/2008 |
| 7417924 | Apparatus, systems and methods for determining position of marine seismic acoustic receivers Apparatus, systems and methods for calculating position of marine seismic acoustic receivers, and for estimating sound velocity profile of a fluid, are disclosed. One position calculation system includes a vessel, two or more vessel hull-mounted transmitters, a plur... | 08/26/2008 |
| 7411399 | Electromagnetic survey system with multiple sources Multiple sources are provided for a transmitter cable for use in electromagnetic surveying. The transmitter cable includes a dipole antenna comprising a pair of spaced apart electrodes mounted on their respective cables. Two antennas may be powered from each source.... | 08/12/2008 |
