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5038378 |
Method and apparatus for smoothing measurements and detecting boundaries of features
A method and apparatus are described for removing noise by smoothing fine resistivity measurements made with a tool from inside a borehole penetrating an earth formation. Pixel values...
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4958286 |
Time-variant filter coefficients
There is disclosed herein an improved method for processing the output signals from the receiver coil of an induction logging tool to account for nonlinear attenuation and phase shift of the...
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4916616 |
Self-consistent log interpretation method
Responses of subsurface formations adjacent a well borehole are obtained from a number of types of well logs. The well logs typically include a resistivity log, a gamma ray log, a density log, a...
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4875015 |
Multi-array borehole resistivity and induced polarization method with mathematical inversion of redundant data
Multiple arrays of electric or magnetic transmitters and receivers are used in a borehole geophysical procedure to obtain a multiplicity of redundant data suitable for processing into a resistivity...
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4855912 |
Method and apparatus for measurement of the thermal behavior of porous media
A method and apparatus for investigating earth formations surrounding a borehole operates by selectively heating a region of the formations, and measuring the thermal response to obtain useful...
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4800496 |
Method for determining induction sonde error
A method for determining a sonde error characteristic of an induction tool is disclosed. The method includes the step of measuring an electrical characteristic which may be the real or quadrature...
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4796186 |
Conductivity determination in a formation having a cased well
Methods and apparatuses for determining conductivity of a subterranean formation traversed by a well, particularly a cased well are provided. Variations in casing conductivity and/or electrode...
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4755944 |
Method for obtaining dielectric constant and conductivity information on subsoil structure using continuous complex geotomography
The present invention relates to an economical, high resolution non-destructive method to remotely image rock mass and subsoil features. More specifically, the invention relates to a method...
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4752881 |
Electrical resistivity geological surveying apparatus and method utilizing plural cable sections with controlled distributed electrode/cable conductor switching
A resistivity surveying apparatus comprises a base station (9) and 30 reels (RL1 to RL30). The base station (9) comprises a computer (10) and a resistivity meter (11) having four output terminals....
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4751646 |
Method for determining original saturations in a produced field
For a formation zone of a well, a method for determining the relationship between bulk volume of oil φ o as a function of total effective formation porosity φ E and height h above the oil water...
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4736300 |
Automatic gain control of formation measurements by varying induced current flow
In apparatus for investigating earth formations traversed by a borehole, improved methods and apparatus are provided for performing inductive type formation measurements. A transmitter coil of a...
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4714889 |
Method of interpreting impedance distribution of an earth formation using precursor logging data provided by a multi-electrode logging array stationary within a borehole
The response characteristics of a combination of hole-centered electric logging tools in a variety of borehole conditions can be obtained by means of impedance values as entries of a matrix...
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4677385 |
Methd of logging an earth formation penetrated by a borehole to provide an estimate of impedance distribution with depth using end emitting current electrodes sequentially activated and a multiplicity of potential electrodes of a moving logging array
The response characteristics of a combination of hole-centered electric logging tools in a variety of borehole conditions can be obtained by means of impedance values as entries of a matrix...
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4675611 |
Method of logging an earth formation penetrated by a borehole to provide an improved estimate of impedance distribution of the formation
The response characteristics of a combination of hole-centered electric logging tools in a variety of borehole conditions can be obtained by means of impedance values as entries of a matrix...
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4658215 |
Method for induced polarization logging
An induced polarization tool using focused electrodes that uses direct coupling in the focusing loop to prevent spurious phase shifts. The invention uses a differential-in differential-out...
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4617825 |
Well logging analysis methods for use in complex lithology reservoirs
Advanced analytic methods and formulas have been developed for 2- and 3- mineral solutions in complex lithology reservoirs. Required logs are density, neutron, acoustic, and photoelectric...
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4611173 |
Induction logging system featuring variable frequency corrections for propagated geometrical factors
Variable frequency induction well logging methods and apparatus are disclosed having an approximately constant vertical response function. The frequency of operation is automatically selected to...
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4541275 |
Log correlation method and apparatus
An improved method and apparatus for correlating logging curves particularly adapted to formation dip determination from wire line dip meter measurements. A plurality of data sets each having a...
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4531188 |
Methods for automatic processing of information obtained by well logging
Method for automatic processing of well logging information in order to determine the clay parameters, the clay content and to calibrate the porosity and density measurement tools. Among the...
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4514809 |
Dynamic range control of electrode pad current in well logging tools
In apparatus for investigating earth formations traversed by a borehole, improved methods and apparatus are provided for achieving dynamic range control of formation measurements. In one embodiment...
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4513376 |
Phasor processing of induction logs including skin effect correction
A method and system for processing induction measurements of sub-surface formations taken by an induction logging system at various depths in a borehole is disclosed. The method reduces the effects...
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4499421 |
Digital induction logging system including means for generating a plurality of transmitter frequencies
A digital induction resistivity logging system is disclosed for digitally measuring phase components in a receiver signal generated in response to eddy currents flowing in the earth's sub-surface...
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4499422 |
Digital induction logging tool including means for compensating for phase shift errors
A digital induction resistivity logging tool is disclosed for digitally measuring both the in-phase (R) and quadrature (X) phase components in a receiver signal generated in response to induce eddy...
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4486836 |
Well logging: utilizing superposition of step-profile responses of logging tools to improve logs
Disclosed is a method of improving well logs, such as induction logs and LATEROLOGS, by taking into account the effect on a log measurement both of the particular bed in which it is taken and of...
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4484278 |
Well logging: utilizing superposition of step-profile responses of logging tools to improve logs
Disclosed is a method of improving well logs, such as induction logs and laterologs, by taking into account the effect on a log measurement both of the particular bed in which it is taken and of...
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4482959 |
Well logging: utilizing superposition of step-profile responses of logging tools to improve logs
Disclosed is a method of improving well logs, such as induction logs and LATEROLOGS, by taking into account the effect on a log measurement both of the particular bed in which it is taken and of...
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4471436 |
Phasor processing of induction logs including shoulder and skin effect correction
A method and system for processing induction measurements of sub-surface formations taken by an induction logging system at various depths in a borehole is disclosed. The method reduces the...
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4467425 |
Deconvolution filter for induction log processing
A method and system for processing induction measurements of sub-surface formations taken by an induction logging system at various depths in a borehole is disclosed. The method reduces the...
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4314338 |
Method of generating subsurface characteristic models
A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with a well logging device. A set of actual measurement values...
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4314339 |
Method of generating subsurface characteristics models
A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with the well logging device. A set of actual measurement values...
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4313164 |
Method of generating subsurface characteristic models
A method of computer generating a subsurface characteristic model which is substantially consistent with readings taken in a well with a well logging device. A set of actual measurement values...
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4122387 |
Apparatus and method for simultaneously logging an electrical characteristic of a well formation at more than one lateral distance from a borehole
A method and apparatus is disclosed wherein simultaneous logs may be made at different lateral distances through a formation from a borehole by guard electrode systems located on a sonde which is...
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4100483 |
Dielectric well logging system and method with error correction
A dielectric well logging system includes a logging tool adapted to be passed through a borehole traversing an earth formation. The logging tool includes a transmitter which induces electric energy...
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3965413 |
Determination of the polarity of remanent magnetization of an earth formation penetrated by a bore hole using a highly accurate magnetometer followed by processing of resulting as well as associated data
In accordance with the present invention, the polarity of the remanent magnetization of an earth formation penetrated by a bore hole is accurately determined utilizing a highly sensitive...
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3487681 |
METHOD AND APPARATUS FOR RESOLVING WELL LOGS
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3256480 |
Method of detecting geologically anomalous bodies lateral to a well bore by comparing electrical resistivity measurements made using short-spaced and long-spaced electrode systems
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3230445 |
Methods and apparatus for investigating earth formations utilizing weighting factors varied as a function of a formation characteristic
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3226633 |
Induction logging apparatus including non-linear means for translating a detected signal
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3166709 |
Method and apparatus for providing improved vertical resolution in induction well logging including electrical storage and delay means
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3105190 |
Induction logging system utilizing surface reciprocal producing means
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2912165 |
Computer
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