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| Number | Title | Issue Date |
| 8164340 | Method for determining electromagnetic survey sensor orientation A method for determining orientation of an electromagnetic survey sensor includes deploying the sensor at a selected position on the bottom of a body of water. An electromagnetic field is generated at a selected position in the body of water. A portion of the electr... | 04/24/2012 |
| 8154295 | Method for determining electric field response to an electromagnetic field induced in the Earth's subsurface A method for determining a component of electric field response to a time varying electromagnetic field induced in the Earth's subsurface involves measuring magnetic field gradient in at least two orthogonal directions in response to the induced electromagnetic fiel... | 04/10/2012 |
| 8148990 | Marine electromagnetic acquisition apparatus with foldable sensor arm assembly A marine electromagnetic acquisition apparatus includes a sensor module having at least one sensor associated therewith. A sensor arm assembly is coupled to the sensor module. The sensor arm assembly has at least one sensor arm and at least one sensor disposed along... | 04/03/2012 |
| 8134369 | Method of testing electric field recording of a marine electromagnetic sensor cable A method of testing the electric field recording of a marine electromagnetic sensor cable including electrodes is provided. The method includes causing current to flow between a pair of first electrodes disposed along the marine electromagnetic sensor cable. The flo... | 03/13/2012 |
| 8026723 | Multi-component marine electromagnetic signal acquisition method A method for determining a component of electric field response of the Earth's subsurface to a time-varying electromagnetic field induced in the Earth's subsurface is provided. The method includes measuring electric field response along a nonlinear pattern on at lea... | 09/27/2011 |
| 7872477 | Multi-component marine electromagnetic signal acquisition cable and system A marine electromagnetic sensor cable includes a plurality of sensor modules disposed at spaced apart locations along a cable. Each module includes at least one pair of electrodes associated with the module. The electrodes are arranged to measure electric field in a... | 01/18/2011 |
| 7800374 | Multi-component marine electromagnetic signal acquisition cable and system A marine electromagnetic sensor cable includes a plurality of sensor modules disposed at spaced apart locations along a cable. Each module includes at least one pair of electrodes associated therewith. The electrodes are arranged to measure electric field in a direc... | 09/21/2010 |
| 7746077 | Method for measuring the magnetotelluric response to the earth's subsurface A method for measuring magnetotelluric response of the Earth includes measuring transient controlled source electromagnetic response of the subsurface below a body of water over a plurality of actuations of an electromagnetic transmitter. The transient response meas... | 06/29/2010 |
| 7705599 | Buoy-based marine electromagnetic signal acquisition system A sensor cable system for measuring electromagnetic response of the Earth's subsurface includes a sensor cable deployable on the bottom of a body of water. The sensor cable has a plurality of electromagnetic sensing devices thereon at spaced apart locations. A syste... | 04/27/2010 |
| 7574410 | Fast 3D inversion of electromagnetic survey data using a trained neural network in the forward modeling branch A method for interpreting electromagnetic survey data includes acquiring electromagnetic survey data near a top of a portion of the Earth's subsurface. An initial model of the portion of the Earth's subsurface is generated. The model includes at least spatial distri... | 08/11/2009 |
| 7474101 | Method for combined transient and frequency domain electromagnetic measurements A method for interpreting transient electromagnetic survey data includes imparting an electromagnetic field in the Earth's subsurface by passing electric current through a transmitter antenna. The electric current includes switched direct current at a selected switc... | 01/06/2009 |
| 7388382 | System for measuring Earth formation resistivity through an electrically conductive wellbore casing An instrument is disclosed for measuring resistivity of Earth formations from within a conductive pipe inside a wellbore drilled through the formations. The instrument includes a plurality of housings connected end to end and adapted to traverse the wellbore. At lea... | 06/17/2008 |
| 7356411 | Method for acquiring and interpreting transient electromagnetic measurements A method for interpreting transient electromagnetic survey data includes measuring transient response of a medium over a plurality of switching events. The measured transient response to a first one of the current switching events is modeled. Transient response to t... | 04/08/2008 |
| 7340348 | Method for acquiring and interpreting seismoelectric and electroseismic data A method for subsurface Earth surveying includes acquiring seismic data over a selected region of the Earth's subsurface. Seismoelectric data are acquired over a selected region of the Earth's subsurface. Electroseismic data are also acquired over a selected region ... | 03/04/2008 |
| 7328107 | Integrated earth formation evaluation method using controlled source electromagnetic survey data and seismic data A method for determining spatial distribution of properties of the Earth's subsurface includes obtaining seismic data over a survey area of the Earth's subsurface. Controlled source electromagnetic survey data are obtained over substantially the same survey area. An... | 02/05/2008 |
| 7272503 | Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response A method for determining spatial distribution of resistivity of Earth formations surrounding a wellbore having a conductive pipe therein includes measuring resistivity of the Earth formations using measurements of current leakage along the pipe at selected axial pos... | 09/18/2007 |
| 7203599 | Method for acquiring transient electromagnetic survey data A method for controlled source electromagnetic Earth surveying includes deploying a plurality of electromagnetic sensors in a selected pattern at the top of an area of the Earth's subsurface to be surveyed. At least one of a transient electric field and a transient ... | 04/10/2007 |
| 7202671 | Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response A method is disclosed for determining spatial distribution of resistivity of Earth formations surrounding a wellbore having a conductive pipe therein. The method includes measuring resistivity of the Earth formations using measurements of current leakage along the p... | 04/10/2007 |
| 7088097 | Method for fitting a sum of exponentials to experimental data by linearization using a numerical integration approximation, and its application to well log data A method for analyzing formations using measurements from a detector in response to energy imparted therein. The measurements have characteristics which exponentially reduce in magnitude with time. The method includes (a) determining, an N-th order integral of the v... | 08/08/2006 |
| 7034538 | Method for measuring earth formation resistivity through an electrically conductive wellbore casing An apparatus is disclosed for measuring formation resistivity through a conductive pipe in a wellbore. The apparatus includes a sonde adapted to be moved through the wellbore, and a plurality of voltage measurement electrodes are disposed on the sonde at spaced apar... | 04/25/2006 |
| 6975121 | System for measuring earth formation resistivity through and electrically conductive wellbore casing An apparatus is disclosed for measuring formation resistivity through a conductive pipe in a wellbore. The apparatus includes a sonde adapted to be moved through the wellbore, and a plurality of voltage measurement electrodes are disposed on the sonde at spaced apar... | 12/13/2005 |
| 6952101 | Method for determining direction to a target formation from a wellbore by analyzing multi-component electromagnetic induction signals A method is disclosed for determining a direction of a target formation with respect to an instrument in a wellbore. The target has an electrical conductivity different than earth formations surrounding the wellbore. The method includes inducing time varying electro... | 10/04/2005 |
| 6891376 | Method for attenuating conductive sonde mandrel effects in an electromagnetic induction well logging apparatus An electromagnetic induction logging method is disclosed. The method includes measuring electromagnetic induction response in earth formations surrounding a wellbore. The measuring is performed on an electrically conductive sonde support. The measured response is de... | 05/10/2005 |
| 6739165 | Combined surface and wellbore electromagnetic measurement system and method for determining formation fluid properties A method is disclosed for monitoring a reservoir. The method includes making a first set of electromagnetic measurements at locations along the Earth's surface, making a first measurement from at least one sensor disposed proximate the reservoir in a wellbore and de... | 05/25/2004 |
| 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 measured by a direct current signal. A response to the initial ... | 12/30/2003 |
| 6541975 | Integrated borehole system for reservoir detection and monitoring In one embodiment the invention comprises a system for generating an image of an Earth formation surrounding a borehole penetrating the formation. Resistivity of the formation is measured using a DC measurement, and conductivity and resistivity of the for... | 04/01/2003 |
