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| Number | Title | Issue Date |
| 5903515 | Spatial de-aliasing of the 3-D Kirchhoff DMO operator A method for generating an unaliased 3-D DMO operator using two dimensional sampling theory to the spatial traverse of the operator as well as to the temporal axis. First a continuous DMO operator is generated along the line segment connecting a source an... | 05/11/1999 |
| 5886255 | Method and apparatus for monitoring mineral production Long-term changes in the distribution of a mineral in a subsurface deposit, due to commercial production of the mineral, are monitored by suitable instrumentation. The monitoring instrumentation is installed in combination with commercial mineral producti... | 03/23/1999 |
| 5829242 | Process for manufacturing a rope The modulus of stretch af a fibrous rope is reduced by impregnating a pluity of spaced-apart segments of the rope with an epoxy plastic thereby to reduce the modulus of stretch of the segment equal to zero after curing the plastic. The overall modulus of... | 11/03/1998 |
| 5828570 | Unconstrained 2-D transformation filter An unconstrained transformation filter operator that is efficient in terms of computer resources and that improves circularly symmetric migrated impulse response for steep dips. The filter operator combines selected desirable attributes of the more effici... | 10/27/1998 |
| 5793702 | Method for measuring the water bottom reflectivity The two-way water-layer travel time, ͌, is derived from duel-mode seismic sensor data by cross-correlating the Fourier transforms of the sum and difference of the velocity and pressure signatures. The Z-transform of ͌ evaluates one of the two Backus var... | 08/11/1998 |
| 5761062 | Extended offset data processing Wide-angle reflections that have been overcorrected using a simple two-term hyperbolic moveout correction are adjusted by application of a bi-quadratic term. The biquadratic term is derived by scanning the overcorrected reflections for residual velocity. ... | 06/02/1998 |
| 5757722 | Method for verifying the location of an array of detectors A high-order, polynomial regression curve is fitted to a global set of first-arrival pick times as a function of the nominal ranges between a plurality of acoustic sources having known geodetic coordinates and a plurality of acoustic detectors whose coord... | 05/26/1998 |
| 5729506 | 3-D multiple attenuation A computationally economical method for applying multi-dimensional multiple-reflection attenuation to a marine seismic-signal data set comprised of a plurality of common shot gathers that have surface-multiple wavefields embedded therein. The multi-dimens... | 03/17/1998 |
| 5724241 | Distributed seismic data-gathering system A distributed seismic data acquisition system includes a vast plurality of Autonomous Data Acquisition Modules (ADAM) to each of which are interconnected a subplurality of data-collection channels. Each data collection channel is comprised of an array of ... | 03/03/1998 |
| 5724310 | Traveltime generation in the presence of velocity discontinuities An array of output image points is distributed over a velocity model of a subsurface region of interest. A fan of rays is shot from each of a plurality of acoustic source points along the surface, the angular separation between the rays being equal to π/... | 03/03/1998 |
| 5724307 | Method for improving the coupling response of a water-bottom seismic sensor A receiver consistent deconvolution operator models the damped oscillatory wavetrain that is related to geophone coupling to the water bottom. The operator is a best-fitting function that endeavors to describe the difference in coupling response between a... | 03/03/1998 |
| 5717655 | Method for providing uniform subsurface coverage in the presence of steep dips A method for minimizing non-uniform insonification of subsurface formations in the presence of steep dips when advancing a swath of elongated parallel seismic streamer cables along a line of survey. A first acoustic source is stationed at the leading end ... | 02/10/1998 |
| 5709497 | Latching device A cluster of seismic streamer cable utility modules is provided with a set of hinged latching members. The hinged latching members are adapted secure the cluster to the steamer cable by closing the hinged latches around corresponding collars mounted on th... | 01/20/1998 |
| 5696733 | Method for verifying the location of an array of sensors A high-order polynomial regression curve is fitted to a global set of first arrival times as a function of the nominal ranges between a plurality of acoustic sources having known geodetic coordinates and a plurality of acoustic detectors whose coordinates... | 12/09/1997 |
| 5692918 | Two-piece universal cable-connector adapter A seismic cable connector adapter assembly for coupling sub-diameter seismic streamer-cables to standard-sized instrumented cable connector modules.... | 12/02/1997 |
| 5684693 | Method for bit-stream data compression A plurality of sensors, each of which is coupled to a data channel, are mounted on a downhole logging tool for periodically measuring and sampling, at preselected timed sample intervals, petrophysical characteristics of the borehole sidewall material. The... | 11/04/1997 |
| 5683115 | Weak link for a seismic streamer cable connector module The rotatable cylindrical sleeve that comprises the female cable connector termination of a seismic streamer cable section is made in two telescoping parts. The two telescoping parts are indexed together by a shear pin to form a weak link assembly. If a s... | 11/04/1997 |
| 5677892 | Unaliased spatial trace interpolation in the f-k domain A computer-aided method for providing a de-aliased output data set dL (t,xL,yL) from a spatially aliased, three-dimensional, input data set of known seismic signals, a(t,x,y), where L is an interpolator. The known data set... | 10/14/1997 |
| 5616840 | Method for estimating the hydraulic conductivity of a borehole sidewall fracture A method for modeling fracture zones in the sidewall of a borehole and for estimating the hydraulic conductivity thereof. The method first separates Stoneley wavefields into a directly-transmitted wavefield and a one-way (i.e. downgoing) reflected wavefie... | 04/01/1997 |
| 5617372 | Unaliased spatial trace interpolation in the f-k domain Sparsely spatially-sampled seismic time-scale trace gathers may be aliased for certain spatial and temporal frequencies. Aliasing may be avoided by application of a spatial interpolation scheme that uses the phase difference between the f-k phase spectra ... | 04/01/1997 |
| 5610875 | 3-D converted shear wave rotation with layer stripping A method for using a compressional-wave source to produce converted shear waves which are subjected to Alford 4-component rotation to align the observation coordinates with the natural coordinates of the principal anisotropic axes of a birefringent format... | 03/11/1997 |
| 5601046 | Means and method for dynamically monitoring the stretch of a seismic streamer cable A variable-gap, distributed-capacitance sensor provides an output signal that is a function of its instantaneous elongation. The sensor is integrally associated with a seismic isolator section for measuring the instantaneous stretch thereof.... | 02/11/1997 |
| 5587968 | Method for measuring the near-surface shear wave velocity for use in determining 3-component 3-D statics In the presence of an anisotropic near-surface earth layer, orthogonally oriented microspreads are provided from which shear-wave velocity vectors Vsiθ and Vsθ may be determined. The respective velocities are calculated from measur... | 12/24/1996 |
| 5586482 | Two-stage fluidic actuator A fluidic actuator includes dual-element, differential area pistons consisting of a power piston and an extender piston that are mounted in a double-chamber cylinder. A spring-loaded throttling plunger is slidingly mounted in a longitudinal bore in the po... | 12/24/1996 |
| 5579282 | Method for determining the shear-wave velocity beneath a body of water A method for measuring the velocity of shear waves in a formation beneath a body of water. The shear wave velocity is derived from the parameters of water density, water-bottom reflection coefficient, formation compressional wave, velocity and the propaga... | 11/26/1996 |
| 5555218 | Computation of Q-derived static corrections from seismic data The amplitude spectrum is generated within a selected time window of a seismic time scale recording. The rate of change, Q, of the natural logarithm of the signal amplitude is measured with respect to frequency. A Q-derived static time shift is computed a... | 09/10/1996 |
| 5541889 | Borehole fluid replacement means and method The signal-to-noise ratio of televiewer signals from a rotary sidewall acoustic-beam scanner is improved by replacing the volume of borehole drill fluid that lies in the path of the acoustic beam with a solid medium characterized by a lower coefficient of... | 07/30/1996 |
| 5540093 | Method for optimizing the alignment of a horizontal borehole relative to the strike of rock-layer stress planes As a means for determining the preferred azimuthal alignment of a horizontal borehole, the reflection travel time vectors between an acoustic source and a plurality of equidistant seismic receivers are measured along a plurality of directional wavefield t... | 07/30/1996 |
| 5539704 | Bayesian sequential Gaussian simulation of lithology with non-linear data A multivariate stochastic simulation application that involves the mapping of a primary variable from a combination for sparse primary data and more densely sampled secondary data. The method is applicable when the relationship between the simulated prima... | 07/23/1996 |
| 5530679 | Method for migrating seismic data An approximate method for imaging seismic data that originates from steeply dipping or overturned strata. The method provides a viable alternate approach to the generalized f-k migration that does not rely explicitly on some form of perturbation series ex... | 06/25/1996 |
| 5526637 | Brush-clearing device A vegetation harvesting/clearing device consists of an assembly including a pair of hinged jaws and an open noose of cable, all of which is mounted on a load-lifting device of a prime mover such as a farm tractor. The open jaws are deployed to cause a pat... | 06/18/1996 |
| 5511040 | Method for calculating the optimum vibrator spacing for ground roll reduction A method for increasing the signal-to-coherent-noise ratio of seismic signals propagating along multi-azimuthal trajectories by abating Rayleigh wave contamination. A plurality of seismic receivers surround a nest of vibrators separated by a first uniform... | 04/23/1996 |
| 5508914 | Method for calculating static corrections for seismic data An efficient method for evaluating static corrections based upon molecular dynamics simulation. This approach combines the global minimization mechanism of simulated annealing and the deterministic approach of molecular dynamics simulation and finds the s... | 04/16/1996 |
| 5508973 | Method for determining the principal axes of azimuthal anisotropy from seismic P-wave data A method for measuring the principal axis of fracture-induced formation anisotropy. Amplitude vectors are measured from CMP gathers oriented along in-line and cross-line wavefield trajectories. The amplitude vectors are resolved with the known orientation... | 04/16/1996 |
| 5502686 | Method and apparatus for imaging a borehole sidewall A method for concurrently gathering acoustic and resistivity data for mapping the texture of the sidewall of a borehole using a single imaging tool. The data are sampled, formatted and merged to provide a single composite image of the borehole sidewall.... | 03/26/1996 |
| 5502687 | Method for datumizing seismic data by forward modeling Disclosed is a method for processing geophysical data that have been gathered over irregular topography. According to the method, a datum is established that lies above the highest topographic peak. The data are time-shifted from the surface to the datum ... | 03/26/1996 |
| 5497356 | Method and apparatus for verifying the location of a seismic bottom cable in real time One or more slave acoustic transponders are secured to selected parts of a seismic bottom cable whose location is imperfectly known. A master transponder broadcasts an interrogation pulse from each of a number of different, known locations distributed alo... | 03/05/1996 |
| 5491669 | Method for identifying and suppressing anomalous frequency components in seismic data A method for spectral noise abatement from seismic data. The data are decomposed into organizational components from which a noise component can be resolved by well-known iterative methods. A statistic is calculated by comparing the measured spectral cont... | 02/13/1996 |
| 5487433 | Core separator assembly An assembly for dispensing a core separator ring on the top of a previously-cut core that is ejected from a core-cutting bit in a storage bin. The core separator assembly is integral with the forward end of the core ejector system.... | 01/30/1996 |
| 5479376 | Method for compensating seismic wavefield amplitudes for transmission losses in the overburden The relative amplitudes of seismic reflection data contains very useful information about the subsurface earth formations. Surface and subsurface-consistent amplitude processing identifies and corrects for the variability introduced by instrumentation and... | 12/26/1995 |
