Special Digital System Patents (Class 367/60)
  • Patent number: 10775523
    Abstract: A survey method includes generating a first amplitude modulation signal by amplitude-modulating a carrier wave repeating the same pattern at a predetermined cycle in each of a plurality of vibrators with a modulation signal whose cycle is 1/m times the predetermined period and is different for each of the vibrators, transmitting the seismic wave based on the first amplitude modulation signal, generating a second amplitude modulation signal in one or more receivers, the second amplitude modulation signal being identical to the first amplitude modulation signal generated by any one of the seismic vibrators, generating a reception signal in each of the one or more receivers by receiving a synthetic seismic wave in which the seismic waves generated by the seismic vibrators are synthesized, calculating a correlation value between the reception signal and the second amplitude modulation signal, and analyzing characteristics of the medium on the basis of the correlation value.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: September 15, 2020
    Assignee: JAPAN OIL, GAS AND METALS NATIONAL CORPORATION
    Inventors: Mamoru Takanashi, Yuki Nakamura, Yosuke Kunishi
  • Patent number: 9684085
    Abstract: A method for maximizing a repeatability between a base seismic survey and a monitor seismic survey of a same surveyed subsurface during a 4-dimensional (4D) project. The method includes receiving first seismic data associated with the base seismic survey; receiving second seismic data associated with the monitor seismic survey, wherein the monitor seismic survey is performed later in time than the base seismic survey; estimating subsurface reflection-points and incidence angles; determining 4D-binning based on the estimated subsurface reflection-points and incidence angles; and maximizing the repeatability between the first seismic data and the second seismic data by using the 4D-binning.
    Type: Grant
    Filed: November 5, 2013
    Date of Patent: June 20, 2017
    Assignee: CGG SERVICES SAS
    Inventors: Sergio Grion, Ross Haacke
  • Patent number: 8135543
    Abstract: A method, apparatus and system for acquiring seismic data is disclosed that in one aspect receives a seismic signal detected by at least one sensor in response to a seismic energy signal generated by a source at a selected location at a data acquisition unit in data that is in data communication with the sensor, receives at least one parameter of the source and/or receiver at the data acquisition unit; and generates a data block at the data acquisition unit having data representative of the received seismic signal and a header that contains data representative of the at least one parameter of the source and/or receiver. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: March 13, 2012
    Assignee: Inova Ltd.
    Inventors: Dennis R. Pavel, Keith Elder, Richard Eperjesi, Gregg S. Hofland, Martin C. Williams, Scott T. Hoenmans, Andrew Bull, Alan Faichney
  • Publication number: 20030128627
    Abstract: The present invention provides a method and apparatus of acquiring and processing seismic data. One or more controllers are each coupled to seismic sensors and to each other to form a network of data acquisition units. A main controller is coupled to a crossline unit via a cable comprising a synchronizing conductor and one or more power/data conductors. Commands and data are packaged such that multiple routings are possible without affecting final calculations. Each crossline unit is capable of accepting a fiber optic input, a wire input or a combination.
    Type: Application
    Filed: September 9, 2002
    Publication date: July 10, 2003
    Applicant: Input/Output, Inc.
    Inventors: James Iseli, Daniel Schumacher, David Bristow, Allan Johnson, Greyson Knapp, Gary Crews, Charles Kelly, Robert Cronan, Andras Feszthammer
  • Patent number: 6308135
    Abstract: A method and system of preventing soil liquefaction beneath a structure during an earthquake event, by monitoring local seismic precursor events, such as early arrival ground motion using an accelerometer, predicting the onset of a major earthquake tremor, and energizing conductors in the ground by a d-c power source for moving the ground water by electro-osmosis away from the foundation of the structure or to a series of pressure relief wells, whereby lowering the soil pore water pressure and preventing liquefaction of the soil beneath the structure.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: October 23, 2001
    Assignee: Golder Sierra LLC
    Inventor: Grant Hocking
  • Patent number: 6021198
    Abstract: The present invention provides a system for handling and transmitting a file over a communication channel wherein the file may be adaptably compressed to improve throughput. The invention also provides for a method of recovery in the event of a communication failure. The file may be encrypted while it is being transmitted. The compression and transmission may occur while the file is being written, so that the receiving location receives the data in near real time.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: February 1, 2000
    Assignee: Schlumberger Technology Corporation
    Inventors: Julian C. Anigbogu, Kim Reniska
  • Patent number: 5450369
    Abstract: Disclosed is a protocol for transmitting data in a towed hydrophone streamer, including a transmission method and a data frame. The method comprises the steps of (1) receiving a portion of the data frame into a data transmission circuit within a particular module of the streamer, the portion of the data frame representing telemetry data derived from an adjacent module, the transmission circuit transmitting the portion of the data frame to a desired destination, (2) receiving an end-of-data signal into the transmission circuit, the end-of-data signal commanding the transmission circuit to add telemetry data derived from the particular module to the portion of the data frame and (3) adding the data derived from the particular module to the portion of the data frame, the data frame thereby transmitted to the destination and including the data derived from the particular module, the telemetry data ordered within the frame as a function of an order of modules within the streamer.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: September 12, 1995
    Assignee: Whitehall Corporation
    Inventors: Robert H. Mastin, Deane D. Fletcher, John S. Hepp
  • Patent number: 5137830
    Abstract: Measuring of soil gas flux. Particularly a method of measuring soil gas concentration and emission flux during a period of post-compression of the earth's crust. The method includes observing gravitational acceleration on the surface of the earth, as defined by crustal tension and compression and as induced by the Sun and Moon, compensating for variation in acceleration due to geographic location of said observing, locating said crustal tension in the form of a bulge on the surface of the earth, then post-compression measuring of soil gas concentration and emission flux rate during both the long term (approximately 1 to 10 days) and short term (approximately 1 to 8 hours) of maximum soil gas emission.
    Type: Grant
    Filed: February 9, 1989
    Date of Patent: August 11, 1992
    Assignee: Quadrel Research Corporation
    Inventor: George H. Milly
  • Patent number: 5051962
    Abstract: In a representative embodiment of the invention described herein, a well logging system for investigating subsurface formations is controlled by a general purpose computer programmed for real-time operation. The system is cooperatively arranged to provide for all aspects of a well logging operation, such as data acquisition and processing, tool control, information or data storage, and data presentation as a well logging tool is moved through a wellbore. The computer controlling the system is programmed to provide for data acquisition and tool control commands in direct response to asynchronous real-time external events. Such real-time external events may occur, for example, as a result of movement of the logging tool over a selected depth interval, or in response to requests or commands directed to the system by the well logging engineer by means of keyboard input.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: September 24, 1991
    Assignee: Schlumberger Technology Corporation
    Inventor: Francis M. Eaton
  • Patent number: 4901289
    Abstract: A system is provided for acquiring and recording signals delivered by a set of sensors disposed in one or more probes lowered into a well at the end of a multi-function cable.The different signals to be transmitted are multiplexed before being applied to an acquisition chain adapted for amplifying them, digitizing them and coding them before applying them to a transmission channel in the form of blocks of digitized words. The multiplexing means may comprise several multiplexing units. The sampling frequency of each signal and the formation of the blocks of words are adapted to the number of units effectively used. In the surface installation, the blocks of words are dissociated and stored in a memory in a single mode suitable for all the blocks whatever their formation.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: February 13, 1990
    Assignee: Institut Francais Du Petrole
    Inventors: Jacques Cretin, Jean-Francois Therond
  • Patent number: 4819214
    Abstract: A sonic well logging system and apparatus for determination of seismic wave velocities from a seismic wave propagating in a subterranean formation about a wellbore. The system includes the process of imparting a seismic wave into the subterranean formation about the wellbore, and receiving the seismic wave after it has interacted with the subterranean formation at a plurality of semismic receivers positioned in the wellbore. The seismic waves are transformed at each of the seismic receivers into a seismic signal and these signals nonlinearly staked for a selected position in the wellbore to generate a velocity spectrum of seismic wave velocities. Coherency peaks are then selected from the velocity spectrum with each coherency peak having associated therewith a unique seismic wave velocity, such as P-wave, S-wave, tube wave and the like.
    Type: Grant
    Filed: October 29, 1987
    Date of Patent: April 4, 1989
    Assignee: Amoco Corporation
    Inventors: Paul R. Gutowski, Martin L. Smith, Jr., Carl H. Sondergeld
  • Patent number: 4744064
    Abstract: Method and apparatus for digitally deriving arrays from seismic data. Indentical parallel processing elements connected between common input/output buses are each preselected to derive different pluralities of arrays. Array specifications defining the arrays are downloaded into the processing elements. A scan sample set of spatially distributed seismic receivers is periodically generated and placed on the input bus. Each processing element, in response to array specifications, captures and stores all receiver output signals in the scan required to derive its respective arrays, derives its assigned arrays, and delivers resultant array samples to the output bus. Double input and output buffering in the processing elements is provided whereby receiver capture, array derivation, and outputing processes occur simultaneously in each processing element.
    Type: Grant
    Filed: July 20, 1984
    Date of Patent: May 10, 1988
    Assignee: Exxon Production Research Company
    Inventor: Philip A. Hughes
  • Patent number: 4682296
    Abstract: Ultrasonic imaging equipment comprising ultrasonic transducers (A, B, etc.) which are sequentially and repetitively triggerable by equally spaced triggers (Z) to give echoes which can be read, stored and processed in a computer-based recording device is characterized in having means to inhibit the triggers under control of the recording device so that, after one transmission, further transmissions do not take place prior to the recording device reading the echo from said one transmission.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: July 21, 1987
    Assignee: United Kingdom Atomic Energy Authority
    Inventor: John A. Parker
  • Patent number: 4661934
    Abstract: The present invention relates to a ground position controller utilizing a microcomputer system interconnected to a digital field system (DFS) via a system bus, for generating, formatting and displaying information (for insuring integrity of field operations) under a variety of shooting and collecting conditions.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: April 28, 1987
    Assignee: Chevron Research Company
    Inventor: H. T. Carruth, Jr.
  • Patent number: 4661932
    Abstract: A method and apparatus allows dynamic data to be recorded in a drill string for later playback at the surface. The system includes a transducer located in a sub in the drill string which provides electrical responses to a analog to digital converter. A timer circuit provides timer pulses to the converter to cause the response to be converted into a digital value for storing in a recorder. The timer pulses are also used to address the memory location. The timer circuit has the ability to provide a variable number of timer pulses at a variable frequency and at variable intervals. A surface timer circuit provides simultaneous timer pulses to a counter to indicate at the surface which memory location is being filled at any given time.
    Type: Grant
    Filed: December 14, 1983
    Date of Patent: April 28, 1987
    Assignee: Hughes Tool Company - USA
    Inventors: Mig A. Howard, Louis H. Barnard
  • Patent number: 4648063
    Abstract: In a system wherein a peripheral computer is utilized to lighten the load on a central computer or to perform a special function which cannot be performed by the central computer, method and apparatus is provided whereby the central computer can be utilized to program the peripheral computer. A volatile memory is programmed by the central computer and then the volatile memory is switched to the peripheral computer to allow the peripheral computer to run the program set up in the volatile memory to determine if the program is operational. Once the program has been determined to be operational, the program is transferred to a nonvolatile memory which is associated with the peripheral computer system and the program is then available for use in the peripheral computer system.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: March 3, 1987
    Assignee: Phillips Petroleum Company
    Inventor: Kenneth M. Strout
  • Patent number: 4616349
    Abstract: An analog-to-digital converter for use in seismic data processing applications is disclosed which features variants on delta modulation and delta-sigma modulation methods. A series of single bits is output by an analog-to-digital converter based on comparison of a predicted analog signal with the actual analog signal. A low pass filter and subsampling operation is applied to the output digital bits to provide digital words corresponding to the analog signal amplitude. Plural integrator stages are shown which allow reduction of quantization error.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: October 7, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Thomas E. Shirley
  • Patent number: 4587642
    Abstract: A method of enhancing the signal to noise ratio of seismic data includes the steps of repeatedly obtaining, from at least one array of seismic detectors, analog signals representative of sensed vibrations or pressure waves. Each analog signal is converted to discrete digital values on a time correlation basis until a predetermined quantity of analog signals have been converted. In each time correlation, the two most positive digital values and the two most negative digital values are removed. The remaining values for each time correlation are averaged so as to provide a digital representation of the analog signals.
    Type: Grant
    Filed: December 6, 1982
    Date of Patent: May 6, 1986
    Assignee: Texaco Inc.
    Inventors: William S. Currie, David R. DeBaun
  • Patent number: 4549285
    Abstract: The invention provides an apparatus for seismic prospecting which is to effect a correlation in real time between a pilot signal and a picked-up seismic signal. With N being the number of samples corresponding to the desired thoroughness of investigation, the apparatus comprises the following: a buffer of N samples of the pilot signal; at least one buffer for a sample of the picked-up signal; at least one calculation circuit, in which the correlation operations are carried out; at least one result memory, which is to contain the N points of the correlation function; and a circuit for addressing the memories.
    Type: Grant
    Filed: July 7, 1982
    Date of Patent: October 22, 1985
    Assignee: Societe d'Etudes, Recherches et Constructions
    Inventors: Claude Fleurance, Jean-Claude Naudot
  • Patent number: 4373198
    Abstract: The present invention relates to a method and apparatus for selectively providing an alarm-generating digital code so as to alert an operator that the next-in-time positions of a source-detector array are the last approved locations before the recording truck location must be changed, i.e., "rolled forward" a predetermined distance along the line of survey and array parameters renormalized.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: February 8, 1983
    Assignee: Chevron Research Company
    Inventor: H. T. Carruth, Jr.
  • Patent number: 4369505
    Abstract: The present invention relates to testing--at a second recording truck--a positional reference code (generated by a first recording truck); the reference code (associated with next-in-time positions of a source-detector array operatively connected to the second truck) is interrogated using a microcomputer system of a ground positional controller housed in the second truck. Result: coordination of operations (between trucks) is assured.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: January 18, 1983
    Assignee: Chevron Research Company
    Inventor: H. T. Carruth, Jr.
  • Patent number: 4330873
    Abstract: This invention utilizes data collected in the course of reflection seismic prospecting methods to produce a map, such as a vertical profile or a three-dimensional picture, of subterranean earth formations. This is accomplished by aplanatic mapping of received seismic wave trains in the memory unit of a computer taking into account the travel times of waves, the location of the source, the location of the receiver, and the velocity with which the waves travel from the source point to the deflecting point in the earth and from then to the receiver. The data recorded by each source receiver doublet is digitalized and stored aplanatically in the memory unit, taking into account both signs and amplitudes of the signals. The accumulated data represents a map of the earth formations. Sections of this map are plotted to provide desired views of the formations.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: May 18, 1982
    Assignee: United Geophysical Corporation
    Inventor: Raymond A. Peterson
  • Patent number: 4323990
    Abstract: A seismic data generation and collection system is described for use in a exploration vessel for determining the subsea structure of the earth. A plurality of acoustic energy sources are towed behind the boat and acoustic waves are emitted therefrom by conventional means. The reflection at the subsea interfaces of the acoustic waves are picked up by the energy detectors which produce analog signals. These analog signals are then converted to digital data; multiple computers are used to reformat the data into a desired format. A real time monitor computer and monitor plotter may also be provided to assist the operator in evaluation of the operation of the system. The desired record format includes header information relating to the parameters under which the seismic shot was made, which may be written directly onto the magnetic tape containing the seismic data.
    Type: Grant
    Filed: February 4, 1980
    Date of Patent: April 6, 1982
    Assignee: Mobil Oil Corporation
    Inventors: James W. Goode, Wayne A. Penner, Charles D. Ray, Robert G. Nelson
  • Patent number: 4319347
    Abstract: A seismic cable assembly has approximately 500 equally spaced elemental sensor units to receive seismic signals generated in the earth by a seismic impulse generator or "shot". The sensor units each include 3 hydrophones or geophones spaced about 6 feet apart, for a sensor unit length of about 12 feet, to receive seismic signals up to several hundred hertz. Signals representing seismic waves received at each of these 500 units are transmitted from the cable, to a central control and recording unit, mounted in a vehicle such as a towing ship. Connected to the cable will be one or more array-forming systems for processing seismic data from the sensor to synthesize various direction-sensitive hydrophone arrays located along the seismic cable.
    Type: Grant
    Filed: September 19, 1979
    Date of Patent: March 9, 1982
    Assignee: Western Geophysical Co. of America
    Inventor: Carl H. Savit
  • Patent number: 4312051
    Abstract: Sample and hold circuits are utilized to divide data stored in memory into a plurality of channels for display. First-in-first-out buffers are utilized to compensate for the difference between the time required to read data from a memory and the time required for a sample and hold circuit to sample and hold the data.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: January 19, 1982
    Assignee: Phillips Petroleum Company
    Inventor: Terry A. Miller
  • Patent number: 4285052
    Abstract: The electronic roll-along switch consists of several input multiplexers, each having a number of inputs that are connected to seismic detectors, and an output line. A plurality of multiple-input sample-and-hold modules are provided. Corresponding inputs of the respective sample-and-hold modules are paralleled. The output lines of the input multiplexers are connected in consecutive order to the paralleled input of the sample-and-hold modules. The output of each sample-and-hold module is connected to an output amplifier which is couplable to a multichannel seismic recording system. A master controller provides circuitry for connecting any set of several seismic detectors to a like number of channels in the seismic recording system.
    Type: Grant
    Filed: July 26, 1979
    Date of Patent: August 18, 1981
    Assignee: Litton Resources Systems, Inc.
    Inventor: John T. Bobbitt
  • Patent number: 4276620
    Abstract: A multi-channeled digital seismic field stacking system is disclosed for obtaining the composite response to a variable source array. A variable source array is synthesized by applying preselected weighting coefficients to the seismic signals produced in response to a selected number of surface energy impulses. The seismic signals produced by these impulses are amplified, multiplexed and digitized to obtain digital samples to which are applied the weighting coefficients. A digital multiplier is used to multiply each digital sample by a weighting coefficient to obtain a weighted digital sample. Each digital sample is multiplied by two weighting coefficients, a partial and a final. The partial weighted samples from each of the impulses are summed together to form a partial stack, while the final weighted samples are summed together to form a final stack. The variable source array which is synthesized covers two station intervals.
    Type: Grant
    Filed: October 27, 1978
    Date of Patent: June 30, 1981
    Assignee: Geosource Inc.
    Inventors: Twassul A. Kahn, John W. Kiowski, Douglas G. Lang
  • Patent number: 4224474
    Abstract: A seismic data acquisition system provides seismic signal data samples in multiplexed channel sequential order during a recording cycle. The multiplexed data samples from a recording cycle are demultiplexed by storing the data samples in consecutive order in a memory, having addressable locations, in addressed locations separated by a first desired address increment. The data samples are then extracted from addressed locations that are separated by a second desired address increment. Substantially concurrently, data samples from a subsequent recording cycle are stored in the memory locations vacated by the previously extracted data samples. The data samples from the subsequent recording cycle are demultiplexed by extracting stored data samples from memory locations that are separated by a third desired increment. The above steps are repeated for additional recording cycles, using a different address increment for each extraction step.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: September 23, 1980
    Assignee: Western Geophysical Co. of America
    Inventor: Carl H. Savit
  • Patent number: 4214128
    Abstract: In a multichannel seismic system, channel-sequential seismic data samples gathered during a first recording cycle are demultiplexed to sample-sequential format in a core memory. The core memory is divided into pages each of which is addressable in two dimensions by rows and columns as a rectangular matrix. The channel-sequential data samples are serially loaded into the respective pages in channel-sequential order by columns. At the end of the first recording cycle, the data are extracted from the respective pages by rows in sample-sequential order. As the data samples from the first recording cycle are being extracted by rows, data samples from a second recording cycle are loaded serially by rows into the respective pages that were vacated by the extracted data samples of the first recording cycle.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: July 22, 1980
    Assignee: Western Geophysical Co. of America
    Inventors: David B. Bovee, Ben B. Thigpen
  • Patent number: 4201972
    Abstract: This invention relates to an improved system for employing seismic techniques for surveying the subsurface structures of the earth. The invention relates particularly to an improved system for generating, collecting and processing the data during the course of exploration with a group of trucks that travel over the surface of the earth and intermittently stop to perform the required operations. The processing aids in the performance of the generating and collecting step and in the further processing of the collected data. And the data resulting from processing in this invention are transferred to a computer center for further processing. In this system, use is made of two programmable computers to facilitate concurrent processing of seismic waves received in successive setups in different ways.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: May 6, 1980
    Assignee: United Geophysical Corporation
    Inventors: Charles M. Edwards, J. Robert Fort
  • Patent number: 4202048
    Abstract: This invention relates to an improved system for employing seismic techniques for surveying the subsurface structures of the earth. The invention relates particularly to an improved system for generating, collecting and processing the data during the course of exploration with a group of trucks that travel over the surface of the earth and intermittently stop to perform the required operations. The processing aids in the performance of the generating and collecting step and in the further processing of the collected data. And the data resulting from processing in this invention are transferred to a computer center for further processing. In this system, use is made of two programmable computers to facilitate concurrent processing of seismic waves received in successive setups in different ways.
    Type: Grant
    Filed: November 11, 1976
    Date of Patent: May 6, 1980
    Assignee: United Geophysical Corporation
    Inventor: Charles M. Edwards
  • Patent number: 4189704
    Abstract: A system and method for carrying out seismic operations with low energy sources, which involves operating the source at spaced points along a seismic spread, the source points are spaced far enough apart so that their seismic waves originate at different points and travel by different paths to the geophones. The geophone outputs cannot be time stacked. The geophone signals are amplified at constant gain and digitized to 1 bit. If the low energy source is a vibratory source, the 1 bit signals are correlated with a 1 bit version of the sweep signal. The resulting correlograms are digitized to 1 bit and C.D.P. stacked and displayed. If the low energy source is impulsive, the 1 bit amplified signals are C.D.P. stacked and displayed. In C.D.P. stacking, the determination of optimum velocity can be carried out by 1 bit processing.
    Type: Grant
    Filed: August 29, 1977
    Date of Patent: February 19, 1980
    Assignee: Geophysical Systems Corp.
    Inventors: Lincoln A. Martin, William F. Fenley, Jr.
  • Patent number: 4188611
    Abstract: This invention relates to an improved system for employing seismic techniques for surveying the subsurface structures of the earth. The invention relates particularly to an improved system for generating, collecting and processing the data during the course of exploration with a group of trucks that travel over the surface of the earth and intermittently stop to perform the required operations. The processing aides in the performance of the generating and collecting step and in the further processing of the collected data. And the data resulting from processing in this invention are transferred to a computer center for further processing. In this system, use is made of two programmable computers to facilitate concurrent processing of seismic waves received in successive setups in different ways.
    Type: Grant
    Filed: January 9, 1978
    Date of Patent: February 12, 1980
    Assignee: United Geophysical Corporation
    Inventors: Charles M. Edwards, William C. Walter