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| Number | Title | Issue Date |
| 4648063 | Programming a peripheral computer 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 utiliz... | 03/03/1987 |
| 4636956 | Method and device for optimization of seismic data In a method and device for the study of surface layers and subjacent layers of interest, the device comprises receivers and at least two transmission sources spaced at a distance such that a set of traces produced by one of the transmission sources does n... | 01/13/1987 |
| 4635239 | Data processing Data points for a sinusoidal waveform are assigned 2 bit values which indicate the state of the amplitude (positive or negative) and the slope of the sinusoidal signal at the particular data point (positive or negative). The 2 bit values for a plurality o... | 01/06/1987 |
| 4630242 | Adaptive and non-adaptive method for estimating the earth's reflection sequence A method is disclosed for estimating the impulse response of the earth from Vibroseis data. Based on a time domain system identification approach, the earth's impulse response is estimated by operating on the seismic trace data and the vibrator pilot. Two... | 12/16/1986 |
| 4616320 | Seismic strong-motion recorder A digital recorder and method for digitizing and recording seismic events, the recorder being capable of lengthy stand-by periods during which it records lesser events of little interest in a static buffer and then displaces these events with more recent ... | 10/07/1986 |
| 4611312 | Method of seismic collection utilizing multicomponent receivers By using wave tracking rather than a downward continuation concept, two sets of elastic wave fields (one generated by a seismic source, the other recorded by multicomponent geophones) are migrated separately and are then imaged. The process is repeated fo... | 09/09/1986 |
| 4611311 | Method of seismic processing involving converted P- or S-wave data This invention relates to a method of increasing resolution of high-intensity amplitude events in seismic records provided by common midpoint collection methods (CMP) wherein nonsymmetrical travel paths of incident and reflected rays of the generated conv... | 09/09/1986 |
| 4597066 | Method of seismic processing and displaying simultaneously collected conventional and converted P- or S-wave data This invention relates to a method of increasing resolution of high-intensity amplitude events in seismic records provided by common midpoint collection methods (CMP) wherein nonsymmetrical travel paths of incident and reflected rays of the generated conv... | 06/24/1986 |
| 4596005 | Method of seismic collection utilizing multicomponent processing receivers and processing resultant conventional and converted P- or S-wave data This invention relates to a method of increasing resolution of high-intensity amplitude events in seismic records provided by common midpoint collection methods (CMP) wherein nonsymmetrical travel paths of incident and reflected rays of the generated conv... | 06/17/1986 |
| 4564927 | Method and apparatus for testing seismic vibrators A method of seismic exploration, wherein one or more vibratory sources are employed to generate an input signal whose frequency varies as a function of time and wherein the signal is reflected and refracted to detector stations from subsurface beds, in wh... | 01/14/1986 |
| 4554649 | Method for the interpretation of seismic records to yield valuable characteristics, such as gas-bearing potential and lithology strata In accordance with the present invention, progressive changes in amplitude as a function of offset of common gathers can be more easily identified by emphasizing the degree of amplitude variation between "near" and "far" amplitude vs. time traces of each ... | 11/19/1985 |
| 4532618 | System for and method of processing a seismic signal A seismic signal is created, processed and recorded and then analyzed to determine the nature of subterranean formations. A method of creating, processing and recording a seismic signal comprises the steps of creating a seismic signal; detecting the seism... | 07/30/1985 |
| 4528649 | Exploration system for discovering deposits of ore, marker rock and/or economic minerals The present invention provides for the accurate mapping of shallow crustal earth formations by means for refractive seismic waves to identify structure as well as elastic parameters of the strata undergoing survey to indicate deposits of ore, marker rock,... | 07/09/1985 |
| 4509150 | Linear prediction coding for compressing of seismic data A seismic data compression technique is disclosed which comprises sampling each individual seismic trace, operating upon a set number of samples to generate a predicted sample and quantizing the difference between the next sample and the predicted value o... | 04/02/1985 |
| 4467460 | Seismic data acquisition method The field locations of seismic shot points are chosen to produce partial multifold data, the static correction equations of which are at least partially coupled. The seismic cross sections resulting therefrom are substantially improved.... | 08/21/1984 |
| 4397005 | Exploration system for enhancing the likelihood of the discovery of deposits of ore, marker rock and/or economic minerals The present invention provides for the accurate mapping of shallow crustal earth formations by means for refractive seismic waves to identify structure as well as elastic parameters of the strata undergoing survey to indicate deposits or ore, marker rock,... | 08/02/1983 |
| 4393488 | Exploration system and method of determining elastic parameters and subsurface shape of an earth formation so as to indicate likelihood of the formation being an ore, marker rock, economic mineral or the like The present invention provides for the accurate mapping of shallow crustal earth formations by means for refractive seismic waves to identify structure as well as elastic parameters of the strata undergoing survey to indicate deposits of ore, marker rock,... | 07/12/1983 |
| 4390973 | Method for determining the extent of subsurface reaction involving acoustic signals A method determines the extent of subsurface reactions in which random acoustic signals are radiated from a whole area covered by the reaction or from a boundary region, hereafter termed reaction front, between largely undisturbed rocks and those already ... | 06/28/1983 |
| 4380054 | Method and apparatus associated with a microcomputer system for indicating next-in-time parameters, and for controllably generating a positional code for a rollalong switch associated with a seismic source-detector array of an exploration system The present invention relates to a method and apparatus for selectively generating a next-in-time positional code for disconnectably connecting recording circuitry to different but contiguous sets of detectors, i.e. an "active" array, from among a plurali... | 04/12/1983 |
| 4375090 | Method for interpreting seismic records to yield indications of gas/oil in an earth formation such as a sandstone, limestone, or dolostone The present invention indicates that acoustic characteristics associated with gas/oil-containing strata such as a sandstone, limestone or dolostone, including reflectivity coefficients can be normalized (and favorably compared) with similar characteristic... | 02/22/1983 |
| 4373198 | Updating and alerting method and apparatus associated with a microcomputer system for automatically indicating and recording parameters that spatially define locations of seismic exploration spread and source arrays 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 t... | 02/08/1983 |
| 4373197 | Exploration system for enhancing the likelihood of predicting lithology of earth formations associated with deposits of ore, marker rock and/or economic minerals The present invention provides for the accurate mapping of shallow crustal earth formations by means for refractive seismic waves to identify structure, elastic parameters and lithology of the strata undergoing survey to indicate deposits of ore, marker r... | 02/08/1983 |
| 4359766 | Method for reconnaissance geophysical prospecting A method for deriving seismic information of more generalized nature over a relatively large and previously unexplored expanse of land to determine relevant strike, dip, velocity and related information. The method consists of the placing of a plurality o... | 11/16/1982 |
| 4355379 | Continuous automatic migration of seismic data with waveform preservation Amplitude-versus-time information of a seismic time section is automatically migrated so that events on the time section are displaced, both vertically and horizontally, into positions on a seismic depth section that correspond to actual spatial positions... | 10/19/1982 |
| 4346462 | Seismic prospecting method providing for the determination of the flank dip of subterranean layers and device for carrying out the same Seismic prospecting method for determining the flank dip of subterranean layers with respect to the plane of a seismic profile, comprising sequentially transmitting acoustic waves with different directivity diagrams, recording the corresponding reflected ... | 08/24/1982 |
| 4330873 | Aplanatic geophysical exploration system 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 rece... | 05/18/1982 |
| 4326262 | Universal signal generator and signal parameter comparator A novel universal signal generator is disclosed comprising a composite system including a library or bank of signals consisting of pre-recorded signals of desired form which may be selected as the output of the apparatus. The output of the library or bank... | 04/20/1982 |
| 4323876 | Method for reducing multiple events in a seismic record A search is made down each trace of a seismic record at the approximate period of the multiple events to find a trace segment which most resembles a selected later segment of the same trace. An autocorrelation procedure is initially employed to determine ... | 04/06/1982 |
| 4323990 | Seismic exploration system 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 co... | 04/06/1982 |
| 4298968 | Digital reflection searching and section plotting The specification describes methods of and apparatus for converting seismic data to migrated seismic depth sections. The apparatus includes a curve follower for following lines of continuity on seismic time sections which represent reflections from partic... | 11/03/1981 |
| 4298939 | Method and apparatus for applying a regulated voltage A voltage regulation circuit is provided wherein a command from a computer is utilized to turn on a Darlington transistor pair. When the Darlington transistor pair is turned on, a power transistor is allowed to turn on which acts as a switch to supply a v... | 11/03/1981 |
| 4295213 | Composite seismic signal This invention provides for transmission of composite swept sine wave seismic signals wherein auto-correlation side lobes of such signals are reduced. The frequency spectrum of a desired swept sine wave seismic signal is divided into a number of consecuti... | 10/13/1981 |
| 4293933 | Well logging apparatus and method: synthetic logs and synthetic seismograms with extrapolated reflector dip from log measurements A borehole investigating device takes measurements of a subsurface earth formation and provides signals forming sonic, formation density or similar logs of the borehole. Additionally, the investigating device measures the dip of seismic signal reflectors ... | 10/06/1981 |
| 4276619 | Impedance and common mode rejection testing of a multi-channel seismic data gathering apparatus This relates to testing the impedance and common mode rejection characteristics of multi-channel seismic data gathering apparatuses. The apparatus embodying the invention includes a signal recording and computing system with a plurality of input channels;... | 06/30/1981 |
| 4246652 | Seismic source signatured evaluation apparatus Apparatus is provided for determining the conformity of an energy pulse generated by a weight drop seismic source to a defined energy pulse characteristic in order that reflections associated with a non-conforming energy pulse can be rejected. The apparat... | 01/20/1981 |
| 4223399 | Seismic exploration method A seismic exploration method in which a coded energy signal is generated and transmitted into the earth, the seismic energy reflected from within the earth is sensed and sampled to form a raw trace, the raw trace is crosscorrelated with a record of the co... | 09/16/1980 |
| 4218766 | Method of seismic wave amplitude normalization Disclosed is a method of processing geological seismic reflection data to compensate for lateral variations in the attenuation effect which the weathered layer has on the reflected seismic energy waves as they approach an array of detectors at the surface... | 08/19/1980 |
| 4203161 | Method of enhancing common depth point seismic data A method of enhancing a "gather" formed of a plurality of unmoved out common depth point (CDP) data traces. The gather is formed of a plurality of seismic traces arranged in a display in which time varies along the horizontal axis and distance between sou... | 05/13/1980 |
| 4168484 | Method of and apparatus for radiant energy measurement of impedance transitions in media, for identification and related purposes This disclosure deals with measuring either discontinuous or continuous impedance transitions in various media to identify or delineate the properties and nature thereof by transmitting radiant energy waves to such media to produce reflected waves therefr... | 09/18/1979 |
| 4101866 | Marine detector spread having arrays of different lengths A detector spread for marine seismic exploration has arrays with lengths which are dependent upon the acoustic velocity and dip of the subsurface formations being explored, upon the offset distance from the seismic source to the array and upon the reflect... | 07/18/1978 |
