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8185312 |
Downhole surveying utilizing multiple measurements
Systems and methods for controlling a drill string are provided. A method comprises receiving one or more first signals from a first sensor package mounted in a first portion of the drill string at...
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8185314 |
Method and system for determining dynamic permeability of gas hydrate saturated formations
A method and system for determining dynamic permeability of gas hydrate formations including deploying a tool within a wellhole configured for magnetic resonance measurements, determining...
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8185313 |
Classifying potential hydrocarbon reservoirs using electromagnetic survey information
A probabilistic method for classifying observed CSEM response for a resistive anomaly to classify the response into multiple geologic categories indicative of hydrocarbon production potential. Each...
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8143897 |
Short-offset transient electromagnetic geophysical surveying
A method for electromagnetic surveying subsurface formations includes inducing an electromagnetic field in the subsurface formations by passing electric current through a transmitter. Response of...
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8135542 |
Simultaneous inversion of induction data for dielectric permittivity and electric conductivity
A method of inverting induction logging data for evaluating the properties of underground formations surrounding a borehole, the data including induction voltage measurements obtained from a tool...
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8131522 |
Method for estimating and removing air wave response in marine electromagnetic surveying
A method for determining resistivity distribution of formations below a bottom of a body of water from transient electromagnetic signals acquired by imparting a transient electromagnetic field into...
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8126647 |
Lithofacies classification system and method
A method of analyzing characteristics of a subterranean formation includes applying a wavelet transform to measured data or to derived data obtained from the measured data, the measured data...
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8117014 |
Methods to estimate subsurface deviatoric stress characteristics from borehole sonic log anisotropy directions and image log failure directions
Methods and apparatus for estimating stress characteristics of formations. The method comprises: (a) acquiring sonic anisotropy data, image data or both associated with at least one borehole (b)...
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8116979 |
System and method for determining a more accurate resistivity model of a geological formation using time-lapse well logging data
A system and a method for estimating a model of a geological formation are provided. The geological formation has a wellbore extending therethrough. The method includes obtaining a first...
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8112228 |
Statistical correction for standoff in two-terminal imager operating in oil-based mud
An apparatus, method and computer-readable medium for estimating a resistivity property of an earth formation in a borehole filled with oil-based mud. The method includes conveying a logging tool...
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8112227 |
Processing of multi-component induction measurements in a biaxially anisotropic formation
Measurements made by a multi-component logging tool in a borehole are inverted to obtain three principal resistivities (or conductivities) and three associated angles of a bi-axially symmetric...
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8095317 |
Downhole surveying utilizing multiple measurements
Certain embodiments described herein provide a measure of the misalignment of multiple acceleration sensors mounted in the downhole portion of a drill string. In certain embodiments, the measure of...
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8095316 |
Well log normalization
A method of normalizing well log data relating to geology of a subsurface region includes identifying a pair of markers defining a zone on each well log, determining a statistic for a property...
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8095344 |
Methods and systems for modeling material behavior
A method for modeling material behavior includes using empirical three dimensional non-uniform stress and strain data to train a self-organizing computational model such as a neural network. A...
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8085049 |
Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone
This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth...
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8078403 |
Determining permeability using formation testing data
A method, system and computer program product for determining permeability of an earth formation of a reservoir are disclosed. A method may include: providing formation testing data of the earth...
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8060310 |
Geosteering in earth formations using multicomponent induction measurements
A multicomponent induction logging tool is used on a MWD bottomhole assembly. Multifrequency focusing that accounts for the finite, nonzero, conductivity of the mandrel is applied. Using separation...
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8060309 |
Characterization of fracture length and formation resistivity from array induction data
Measurements made by a multi-array/multi-frequency induction resistivity logging tool in a borehole are used for determining the length of fractures in an earth formation and the resistivity of the...
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8055448 |
Imaging of formation structure ahead of the drill-bit
A downhole acoustic logging tool is used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface and is converted back into a guided...
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8055446 |
Methods of processing magnetotelluric signals
A method for processing magnetotelluric data to identify subterranean deposits is provided for. The data comprise the amplitude of alternating magnetic or electrical fields recorded over time in at...
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8050865 |
System and method for measuring resistivity parameters of an earth formation
Disclosed herein is a method of measuring a resistivity parameter of an earth formation. The method includes: applying a first electric measurement current including a first series of pulses to a...
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8046170 |
Apparatus and method for estimating eccentricity effects in resistivity measurements
A method of evaluating an earth formation is disclosed which includes conveying a logging tool into a borehole in the earth formation and using the logging tool to obtain a first set of...
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8036830 |
Resistivity imager in non-conductive mud for LWD and wireline applications
An apparatus, method and computer-readable medium for imaging an earth formation. A downhole assembly having a resistivity sensor is conveyed in a borehole penetrating the earth formation. The...
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8030935 |
Minimizing the effect of borehole current in tensor induction logging tools
Logging tools, methods, and computer programs for use in borehole logging are described. The logging tool includes three or more tensors, each tensor including one or more coils. Each coil is...
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8019549 |
Event-based power management for seismic sensors
A method of event-based power management for seismic sensors is disclosed. The method comprises measuring seismic activity with a seismic sensor and comparing the measured seismic activity from the...
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8019547 |
Remotely reconfigurable system for mapping subsurface geological anomalies
Methods and apparatus are provided for receiving, detecting and transmitting geophysical data from a plurality of electrodes placed in the soil utilizing a dynamically reconfigurable wireless...
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8014988 |
Method for obtaining resistivity from controlled source electromagnetic data
Method for generating a three-dimensional resistivity data volume for a subsurface region from an initial resistivity model and measured electromagnetic field data from an electromagnetic survey of...
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8010290 |
Method of optimizing a well path during drilling
A method for determining a list of survey points for a drilling well includes a feedback loop in which one or more measured parameters are compared with computed or derived parameters. The computed...
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8005619 |
Method of determining reservoir parameters
A method of determining the effect of formation porosity on formation resistivity and parameters derived from the formation resistivity is described, including the step of determining for a depth...
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8005618 |
Logging while drilling system
A logging-while-drilling system for efficiently providing a reliable measurement of various petrophysical properties of subsurface earth formations. The logging-while-drilling system generally...
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7991553 |
Method and system for removing effects of conductive casings and wellbore and surface heterogeneity in electromagnetic imaging surveys
Characterizing a reservoir with electromagnetic imaging surveys includes normalizing measured voltage data by transmitter moment, sorting the normalized voltage data into common receiver profiles,...
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7991555 |
Electromagnetic directional measurements for non-parallel bed formations
An orientation vector, referred to hereinafter as the “geosteering vector,” is directed to the more conductive formation area within the DOI of the tool and away from the more resistive for...
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7991556 |
Methodology and application of multimodal decomposition of a composite distribution
A method for analyzing formation data includes decomposing the formation data into simple components that can be used to reconstruct the formation data, wherein the decomposing is performed at a...
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7983845 |
Method and system for analyzing a laminated sand/shale formation
A method for analyzing a formation, that includes plotting resistivity data points on a resistivity graph to obtain plotted resistivity data points, and selecting a first shale point on the...
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7962287 |
Method and apparatus for optimizing magnetic signals and detecting casing and resistivity
A wellbore tool for optimizing magnetic signals is provided. The wellbore tool has a tool body and an electric current driving device with an insulated gap on the downhole tool body. The electric...
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7957904 |
True amplitude transient electromagnetic system response measurement
A method for mapping sub-surface resistivity contrasts comprising making multi-channel transient electromagnetic (MTEM) measurements using at least one electric source with grounded input current...
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7948238 |
Electromagnetic wave resistivity tool having a tilted antenna for determining properties of earth formations
This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth...
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7937222 |
Method of determining saturations in a reservoir
A method of determining water saturations from a deep-reading resistivity measurement in a reservoir is provided including the step of estimating, through for example a reservoir simulation...
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7933750 |
Method for defining regions in reservoir simulation
A method is disclosed, which is practiced by a reservoir simulator, for simulating a reservoir and generating a set of simulation results, the simulation results including a framework, the...
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7915895 |
Method of calibrating an azimuthal inductive cross-coil or tilted coil instrument
A phase error in measurements made by a resistivity logging tool is estimated by positioning the tool above a conducting surface. Deviation of the measured phase difference between the transmitter...
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7912648 |
Method and apparatus for imaging bed boundaries using azimuthal propagation resistivity measurements
A method for imaging a geologic deposit using data collected from a borehole includes: selecting an instrument for performing electromagnetic (EM) measurements, the instrument including at least...
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7912649 |
Geophysical surveying
Joint processing of seismic and controlled source electromagnetic (CSEM) surface data is performed by using a common rock physics model which relates reservoir properties (such as porosity,...
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7899622 |
Sequential resistivity imaging with asymmetric electrode arrays
A method and instrument provide a very detailed symmetric resistivity image of a formation. A first asymmetric resistivity image is collected from a first arrangement of electrodes, which form an...
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7896073 |
Apparatus for formation resistivity imaging in wells with oil-based drilling fluids
Sequential measurements are made using a two terminal resistivity imaging device wherein the measure electrodes are activated sequentially with the remaining electrodes in a floating mode. This...
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7860655 |
Electromagnetically detecting thin resistive bodies in shallow water and terrestrial environments
A technique includes using a first sensor to perform a first electromagnetic field measurement to obtain first data, which is indicative of the presence of a resistive body. The first data is...
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7822562 |
Removing air wave noise from electromagnetic survey data
Method for removing air wave noise from shallow water controlled source electromagnetic survey data, using only the measured data and conductivity values for sea water (140) and air. The method is...
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7814036 |
Processing well logging data with neural network
An artificial neural network, ANN, and method of training the ANN for inversion of logging tool signals into well logs of formation parameters is disclosed. Properly selected synthetic models of...
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7805247 |
System and methods for well data compression
Systems and methods in which data compression techniques are utilized to fill a predetermined channel capacity are shown. According to one configuration, event data points within test data are...
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7801681 |
Method for phase and amplitude correction in controlled source electromagnetic survey data
The method for correcting the phase of measured electric signals or magnetic signals of field data from a controlled source electromagnetic survey (CSES) by comparing the measured field data...
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7787525 |
Method and apparatus for transmission of well-bore data on multiple carrier frequencies
A wireline telemetry system and method of transmitting data on multiple carrier frequencies. The system and method adjust power level and number of bits-per-carrier to optimally or near-optimally...
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