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6760666 |
Method for determining anisotropic resistivity and dip angle in an earth formation
A method for determining the anisotropic resistivity properties of a subterranean formation traversed by a borehole utilizing a multi-component induction logging tool. The method utilizes the...
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6751557 |
Rock classification method and apparatus
A rock classification system involves the use of a Ternary Diagram (TD) Model and a set of rules in a rule base. A computer, which stores a rock classification software which includes the rule...
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6738720 |
Apparatus and methods for measurement of density of materials using a neutron source and two spectrometers
A system for measuring density of material which can be embodied to measuring bulk density of material penetrated by a borehole. The probe component of the system comprises a source of neutron...
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6727706 |
Virtual steering of induction tool for determination of formation dip angle
A method is disclosed for using a triad induction tool to identify the formation strike and dip angles. The method can be performed in real time. In one embodiment, the method includes: (1)...
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6720771 |
Moving source dipole electromagnetic exploration device for deeper and poorer conductors and a method of detecting such conductors
The present invention relates to a moving dipole source electromagnetic induction device and method for carrying out geophysical surveys. The device is useful to locate deeper sub-surface bodies...
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6694262 |
Method for determining geologic formation fracture porosity using geophysical logs
A novel method for measuring fracture porosity in coal seams is disclosed. Knowledge of fracture porosity is critical to methane production from coal seams as fractures form the main permeable...
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6671623 |
Methods and system for characterizing the response of subsurface measurements to determine wellbore and formation characteristics
Methods and systems are disclosed for characterizing the response of a subsurface resistivity measurement to determine a characteristic of a borehole within the subsurface and/or a characteristic...
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6670813 |
Integrated borehole system for reservoir detection and monitoring
A method is disclosed for generating an image of earth formations penetrated by a wellbore. The method includes generating an initial model of the earth formations using formation resistivity...
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6654692 |
Method of predicting rock properties from seismic data
A computer-implemented method of predicting rock properties of a subsurface formation using reflection seismic data and well log data. Synthetic seismic data is generated from the well log data and...
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6643589 |
Simultaneous determination of formation angles and anisotropic resistivity using multi-component induction logging data
Measurements made by a multicomponent logging tool in a borehole are inverted to obtain horizontal and vertical resistivities and formation dip and azimuth angles of a formation traversed by the...
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6640190 |
Estimating subsurface subsidence and compaction
A method of processing first and second sets of data signals obtained through remotely sensing properties of the same subsurface area at different times comprising the steps of decomposing said...
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6636045 |
Method of determining formation anisotropy in deviated wells using separation of induction mode
Measurements are made with a multicomponent induction logging tool in earth formations in a borehole inclined to earth formations. A combination of principal component measurements is used to...
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6631328 |
METHOD OF DETERMINING RESISTIVITY OF AN EARTH FORMATION WITH PHASE RESISTIVITY EVALUATION BASED ON A PHASE SHIFT MEASUREMENT AND ATTENUATION RESISTIVITY EVALUATION BASED ON AN ATTENUATION MEASUREMENT AND THE PHASE SHIFT MEASUREMENT
A resistivity measurement technique estimates a first value for a first electrical parameter consistent with an assumption that each property of a measured electrical signal senses the first...
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6618676 |
Efficient and accurate pseudo 2-D inversion scheme for multicomponent induction log data
A fast, efficient and accurate pseudo 2-D inversion scheme for resistivity determination of an anisotropic formation uses data from a tool (3DEX) comprising three transmitters and three...
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6606565 |
High resolution array induction tool
A coil array for high resolution induction logging comprises a transmitter, a first receiver set positioned at a first distance from the transmitter and a second receiver set positioned at a second...
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6591195 |
Method of and apparatus for independently determining the resistivity and/or dielectric constant of an earth formation
Techniques are provided to transform attenuation and phase measurements taken in conjunction with a drilling operation into independent electrical parameters such as electrical resistivity and...
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6591194 |
Vertical 1-D inversion with thin layers of equal thickness
Measurements made by a multicomponent logging tool in a borehole are inverted to obtain horizontal and vertical resistivities of a formation traversed by the borehole. The model includes layers of...
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6584408 |
Subsurface formation parameters from tri-axial measurements
Systems and methods are provided for determining various subsurface formation parameters from electromagnetic measurements. Formulas are disclosed for field components in a coordinate system tied...
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6584407 |
Formation resistivity measurement method that eliminates effects of lateral tool motion
A method of compensating for tool motion is disclosed. In one embodiment, the method includes passing a logging tool through a borehole, obtaining a series of tool response measurements, and...
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6574562 |
Determination of formation anisotropy using multi-frequency processing of induction measurements with transverse induction coils
Skin-effect corrections are applied to measurements made by a transverse induction logging tool to give corrected measurements indicative of vertical conductivities of a formation. Data from a...
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6556016 |
Induction method for determining dip angle in subterranean earth formations
A method is disclosed for the determination of the dip angle of anisotropic earth formations surrounding a wellbore. Electromagnetic couplings among a plural of triad transmitters and triad...
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6553314 |
Method for determination of apparent resistivities of anisotropic reservoirs
Shoulder corrections are applied to measurements obtained from a multi-component electromagnetic logging tool. An anisotropic resistivity model is obtained using the shoulder corrected data. The...
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6529833 |
Reservoir monitoring in a laminated reservoir using 4-D time lapse data and multicomponent induction data
Time lapse seismic measurements of a laminated reservoir including sands and shales are processed to determine changes in the laminated reservoir. An initial petrophysical model is obtained at a...
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6502036 |
2-D inversion of multi-component induction logging data to resolve anisotropic resistivity structure
High Definition Induction Logging (HDIL) tools provide reliable information about the vertical and radial variations of resistivity structure in isotropic media. Focusing techniques provide...
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6470274 |
Water saturation and sand fraction determination from borehole resistivity imaging tool, transverse induction logging and a tensorial dual water saturation model
The total porosity of said formation, a fractional volume of the shale, and a resistivity of the shale are determined in a laminated reservoir including sands that may have dispersed shales...
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6449561 |
Induction logging
A method of providing a computed induction log of an induction logging tool run through an interval of a wellbore that extends through a layered formation invaded by wellbore fluid. The method...
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6417667 |
Method for logging and determining wellbore diameter by processing of progressive subsurface electromagnetic resistivity measurements
A method is disclosed for determining a diameter of a wellbore. The method includes inducing an electromagnetic field in the wellbore and a formation surrounding the wellbore from a first location...
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6411902 |
Shale compaction and sonic logs
A method of calculating a theoretical sonic log from an ideal sonic log and resistivity data. The method involves calculating the ideal sonic log assuming a shale sediment and using available data...
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6408295 |
System and method of using clustering to find personalized associations
A system and method for developing association rules which are personalized for a customer. The method includes partitioning (clustering) a set of records corresponding to transactions of items...
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6393364 |
Determination of conductivity in anisotropic dipping formations from magnetic coupling measurements
A method is disclosed for the determination of horizontal resistivity, vertical resistivity, dip and strike angles of anisotropic earth formations surrounding a wellbore. Electromagnetic couplings...
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6384605 |
Method and apparatus for measurement of borehole size and the resistivity of surrounding earth formations
A method and apparatus for determining the size or diameter of boreholes extending to a wide range of dimensions and/or the resistivity of the surrounding earth formations utilizing a well tool...
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6381542 |
Generic, accurate, and real time borehole correction for resistivity tools
A Neural Net (NN) is trained, validated and used for borehole correction of resistivity logging data. In the training stage, the entire range of possibilities of earth models relevant to borehole...
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6353321 |
Uncompensated electromagnetic wave resistivity tool for bed boundary detection and invasion profiling
A resistivity tool and associated method include measuring the phase shift of an electromagnetic signal at different locations. Preferably, this is accomplished by a resistivity tool having three...
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6344746 |
Method for processing the lapse measurements
Resistivity data acquired at two different epochs using different types of tools are jointly inverted. For example, a multiple propagation resistivity (MPR) tool is run first, preferably at several...
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6308136 |
Method of interpreting induction logs in horizontal wells
An induction logging tool is used in an inclined borehole for determining properties of subsurface formations formation away from the borehole. Measurements are made at a plurality of...
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6304086 |
Method and apparatus for evaluating the resistivity of formations with high dip angles or high-contrast thin layers
A method and apparatus for evaluating the resistivity of earth formations surrounding a borehole, particularly high-contrast thin-layer formations or at high dip angles. The method involves...
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6295504 |
Multi-resolution graph-based clustering
An apparatus and method for obtaining facies of geological formations for identifying mineral deposits is disclosed. Logging instruments are moved in a bore hole to produce log measurements at...
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6226595 |
Method and apparatus using multi-target tracking to analyze borehole images and produce sets of tracks and dip data
A Tracking Dip Estimator software including a novel Multi-Sine Tracking Software is adapted to be stored in a computer system memory for instructing a processor to produce a "first output"...
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6219619 |
Inhomogeneous background-based software focusing method for array-type induction logging tools
A method of focusing the measurements from an array type induction logging tool using an inhomogeneous background rather than a homogeneous background. A modeled inhomogeneous background response...
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6216090 |
Interferometric processing method to identify bed boundaries
A method and apparatus are disclosed for identifying boundaries between thin beds having different resistivities. In one embodiment, the method includes (a) transmitting an oscillatory signal from...
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6216089 |
Method and apparatus for producing a conductivity log unaffected by shoulder effect and dip from data developed by a well tool
A method and apparatus for producing a conductivity log, unaffected by shoulder effect and dip, from voltage data developed by a well tool disposed in a borehole. The method involves accessing the...
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6211678 |
Method for radial profiling of resistivity at multiple depths of investigation
A resistivity tool suitable for use in a borehole and configured to obtain a resistivity radial profile at multiple depths of investigation in a geological formation comprises a receiver pair and...
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6181138 |
Directional resistivity measurements for azimuthal proximity detection of bed boundaries
An azimuthally tunable resistivity measurement tool is provided. In one embodiment, the tool comprises a set of three skewed receiver antennas and a transmitter antenna. The three skewed receiver...
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6182013 |
Methods and apparatus for dynamically estimating the location of an oil-water interface in a petroleum reservoir
Methods for locating an oil-water interface in a petroleum reservoir include taking resistivity and pressure measurements over time and interpreting the measurements. The apparatus of the invention...
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6147496 |
Determining electrical conductivity of a laminated earth formation using induction logging
A method is provided for determining an electric conductivity of an earth formation formed of different earth layers, which earth formation is penetrated by a wellbore containing a wellbore fluid,...
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6115670 |
Method, apparatus, and article of manufacture for solving 3D Maxwell equations in inductive logging applications
The present invention involves a method for modeling the response of an electromagnetic tool to a subsurface formation including: (i) formulating a set of frequency-domain Maxwell equations,...
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6108605 |
Low distortion digitally controlled transmitter for use in a well logging tool
A system and method for controlling the transmitted signal for use in a well logging tool, using an iterative method (preferably the method of steepest descent) such that the transmitted signal...
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6098019 |
Resistivity log correction method
A method of determining electric resistivity of an earth formation (1) surrounding a wellbore filled with a wellbore fluid, is provided, which method comprises: operating a resistivity logging tool...
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6092024 |
Method and apparatus for determining resistivity and dielectric anisotropy parameters of earth formations by using multifrequency and/or multispacing measurements
An apparatus and a method for determining the conductivity and dielectric constants of an anisotropic formation uses a redundant set of electromagnetic measurements in combination with anisotropic...
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6088655 |
Electrical resistance tomography from measurements inside a steel cased borehole
Electrical resistance tomography (ERT) produced from measurements taken inside a steel cased borehole. A tomographic inversion of electrical resistance measurements made within a steel casing was...
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