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| Number | Title | Issue Date |
| 8189426 | Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture are described. According to one embodiment, an earth analysis method includes engaging a device with the earth, analyzing the earth in a single substant... | 05/29/2012 |
| 8027223 | Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture Earth analysis methods, subsurface feature detection methods, earth analysis devices, and articles of manufacture are described. According to one embodiment, an earth analysis method includes engaging a device with the earth, analyzing the earth in a single substant... | 09/27/2011 |
| 7672194 | Method of seismic surveying The present invention provides a seismic surveying method in which vibrators in a first vibrator group are actuated at time T0 and vibrators in a second vibrator group are actuated at time T1, where T0 | 03/02/2010 |
| 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 |
| 7508733 | High-frequency processing of seismic vibrator data A method of processing seismic data obtained using a seismic vibrator that includes estimating travel times of direct wave arrivals between the seismic vibrator and an array of seismic receiver locations and wavefield deconvolving the seismic data using the direct w... | 03/24/2009 |
| 7440357 | Methods and systems for determining signatures for arrays of marine seismic sources for seismic analysis Embodiments of the present invention provide systems and methods for deriving a source signature for an array of seismic sources for marine seismic analysis, wherein the systems and methods include factors for determining the source signature taking into considerati... | 10/21/2008 |
| 7382684 | Method for selective bandlimited data acquisition in subsurface formations The method for exploring desired characteristics of a subsurface sector, having at least one resonant frequency, is based on selectively transmitting suitable narrowband energy waves into the subsurface sector, thereby producing narrowband signals reflected off the ... | 06/03/2008 |
| 7376046 | Method of seismic surveying The present invention provides a seismic surveying method in which vibrators in a first vibrator group are actuated at time T0 and vibrators in a second vibrator group are actuated at time T1, where T0 | 05/20/2008 |
| 7348894 | Method and apparatus for using a data telemetry system over multi-conductor wirelines A data telemetry system for multi-conductor wirelines to enhance transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a first terminal of a data re... | 03/25/2008 |
| 7330401 | Seismic vibratory acquisition method and apparatus A method and related apparatus are described for generating acoustic signals for use in a vibratory seismic survey, including the step of combining into a drive signal a high frequency sweep signal, which sweeps upwardly through a high frequency band during a first ... | 02/12/2008 |
| 7310580 | Method for borehole measurement of formation properties The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole... | 12/18/2007 |
| 7295490 | System and method of phase encoding for high fidelity vibratory seismic data In accordance with the present invention, there is provided a method of determining whether a particular high fidelity vibratory seismic survey phase encoding is likely to be a good one based on an analysis of the eigenvalue structure (i.e., eigenvalues, eigenvalue ... | 11/13/2007 |
| 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 |
| 7248052 | Electric power grid induced geophysical prospecting method and apparatus A geophysical prospecting method and apparatus that utilizes the harmonics and sub harmonics waves induced into the earth by the electric power grid. The amplitude-frequency data are converted to amplitude-depth data and further converted to a differential curve. Th... | 07/24/2007 |
| 7227362 | Electric power grid induced geophysical prospecting method and apparatus An underground prospecting method and apparatus that utilizes the harmonics and fractional harmonic waves induced into the earth by the electric power grid. The data are converted to amplitude-depth and phase-depth data. The resulting data may be plotted and are com... | 06/05/2007 |
| 7206255 | Signal processing apparatus and signal processing method The invention provides a method and apparatus by which the direction in or the position at which a signal source such as a sound source is present is estimated. A signal or signals from a signal source or a plurality of signal sources are received by a plurality of ... | 04/17/2007 |
| 7173542 | Data relay for casing mounted sensors, actuators and generators A casing sensor and methods for sensing using a casing sensor are disclosed. The casing sensor includes a casing shoe and a sensor coupled to the casing shoe. A casing data relay includes a downhole receiver coupled to a well casing and a transmitter coupled to the ... | 02/06/2007 |
| 7139219 | Hydraulic impulse generator and frequency sweep mechanism for borehole applications This invention discloses a valve that generates a hydraulic negative pressure pulse and a frequency modulator for the creation of a powerful, broadband swept impulse seismic signal at the drill bit during drilling operations. The signal can be received at monitoring... | 11/21/2006 |
| 7096172 | System and method for automated reservoir targeting Methods and systems for reservoir targeting, the systems implementing methods comprising filtering a plurality of values in a three-dimensional model to eliminate values which are below a threshold to create a filtered three-dimensional model; developing a first mat... | 08/22/2006 |
| 7092824 | Methods and systems for interactive investigation of geophysical data Methods and systems are provided for investigating an image set of geophysical data distributed over a first N-dimensional volume where N≧2. A subvolume that encloses a known feature of interest within a target set of geophysical data distributed over a second N-d... | 08/15/2006 |
| 7072768 | Method for laterally extrapolating soil property data using soil samples and seismic amplitude data within a seismic coverage area A method for laterally extrapolating shallow soil properties using soil samples and seismic amplitude data within a seismic coverage area entails obtaining seismic amplitude data for the seismic coverage area and obtaining average soil property and soil impedance da... | 07/04/2006 |
| 7050355 | Determining the orientation of a seismic receiver, a seismic receiver, and a method or seismic surveying The invention provides a method of determining the orientation of a seismic receiver (4, 6) from seismic data acquired at the receiver (4, 6). The determined orientation can be taken into account in subsequent analysis of the seismic data. This avoids ... | 05/23/2006 |
| 7050356 | Method of seismic surveying A method of seismic surveying comprising the steps of actuating the or each vibrator in a first vibrator group at time T0, and subsequently actuating the or each vibrator in a second vibrator group at time T1 that satisfies T0 | 05/23/2006 |
| 7046165 | Method for collecting geological data ahead of a drill bit A casing sensor and methods for sensing using a casing sensor are disclosed. The casing sensor includes a casing shoe and a sensor coupled to the casing shoe. A casing data relay includes a downhole receiver coupled to a well casing and a transmitter coupled to the ... | 05/16/2006 |
| 7042801 | System for geophysical prospecting using induce electrokinetic effect Methods are disclosed employing seismic waves having infrasonic frequencies in the range of about 0.1–20 Hz for generating electromagnetic waves of similar infrasonic frequency in hydrocarbon bearing subterranean formations located at depths up to about 5000 meter... | 05/09/2006 |
| 7026951 | Data telemetry system for multi-conductor wirelines An improved data telemetry system for multi-conductor wirelines to achieve satisfactory transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a firs... | 04/11/2006 |
| 6912474 | Method and apparatus for high-speed synchronous digital acquisition derived in real -time from analog samples A method and apparatus for real-time derivation of precise digital clock edges and synchronous logic samples from a digital signal having a clock channel and at least one data channel acquires a plurality of temporally offset analog samples during each of a sequence... | 06/28/2005 |
| 6704245 | Seismic prospecting method and device using simultaneous emission of seismic signals obtained by coding a signal by pseudo-random sequences Seismic prospecting method and device using simultaneous emission of seismic signals obtained by coding a signal by pseudo-random sequences, and notably a periodic signal phase modulated by such sequences. Signals such as, for example, periodic signals phase m... | 03/09/2004 |
| 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 |
| 6678617 | Mapping subsurface open fractures using elastically nonlinear interaction of two surface-generated waves This invention relates to mapping the open fractures in the reservoir subsurface formations. To map these open fractures, the elastically nonlinear interaction of the two surface generated seismic waves, as they propagate through the open fractures and ar... | 01/13/2004 |
| 6631783 | Mapping reservoir characteristics using earth's nonlinearity as a seismic attribute This invention relates to mapping the hydrocarbon reservoir characteristics by mapping the reservoir formations that display dynamic elastic nonlinearity responses to the seismic signals. The main reason of this nonlinear behavior in the reservoir rocks i... | 10/14/2003 |
| 6418079 | Method of reducing harmonic interference while using overlapping source point seismic recording techniques Segmenting the spectral distribution of overlapped vibratory signals improves the efficiency of data acquisition while providing reduced harmonic distortion in the time zones of interest. Two identical sweep segments are used. Each sweep segment includes ... | 07/09/2002 |
| 6208587 | Method of detecting seismic events and for detecting and correcting geometry and statics error in seismic data Methods are provided for automatic detection of linear seismic events and the detected events are used in correction of statics and geometry error. According to an example embodiment, a method is provided for automatically detecting substantially linear s... | 03/27/2001 |
| 5991236 | Method of measuring buried objects, geological formations and sediment properties An apparatus and method are provided for detecting buries objects, geological formations or sediment properties by transmitting an acoustic signal and receiving a scattered signal. An acoustic source and an array of receivers are used to correlate the sca... | 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 |
| 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 |
| 5901113 | Inverse vertical seismic profiling using a measurement while drilling tool as a seismic source A reverse VSP system is provided and uses a frequency-controllable modulator of an MWD tool as a downhole seismic source. The modulator has a rotor and stator arranged to provide substantially sinusoidal outputs, and is controlled to provide a "Vibroseis"... | 05/04/1999 |
| 5822269 | Method for separation of a plurality of vibratory seismic energy source signals A method for separating and pre-processing vibratory source data includes varying the phase of vibratory sources according to two patterns. A first pattern is used for odd numbered sources while a second pattern is used for even numbered sources. Each pat... | 10/13/1998 |
| 5790473 | High fidelity vibratory source seismic method for use in vertical seismic profile data gathering with a plurality of vibratory seismic energy sources A method for recording and pre-processing vertical seismic profile 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, c... | 08/04/1998 |
| 5774418 | Method for on-line acoustic logging in a borehole An instant acoustic logging method for use in oil drilling is disclosed in which a drill bit arranged at one end of a drill string and rotated in a well is used as the acoustic source. The method comprises the steps of measuring, at the top of the string,... | 06/30/1998 |
