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| Number | Title | Issue Date |
| 7928732 | Subsurface conductivity imaging systems and methods A subsurface imaging cable includes a plurality of sensor modules, wherein the plurality of the sensor modules are flexible and each of the plurality of the sensor modules is spaced apart on the subsurface imaging cable at a selected distance; and a flexible medium ... | 04/19/2011 |
| 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 |
| 7679367 | Electromagnetic surveying for hydrocarbon reservoirs A method of electromagnetic surveying of an area of seafloor that is thought or known to contain a subterranean hydrocarbon reservoir is described. The method includes broadcasting an EM signal from a horizontal electric dipole (HED) transmitter and obtaining vertic... | 03/16/2010 |
| 7667464 | Time segmentation of frequencies in controlled source electromagnetic (CSEM) applications A method for measuring a resistivity of a subsurface formation that includes transmitting continuously a signal at a first fundamental frequency at full power for a first period of time within a single window of time causing electromagnetic energy to propagate in th... | 02/23/2010 |
| 7397417 | Electromagnetic impulse survey apparatus and method utilizing a magnetic component electromagnetic antenna The invention relates to an apparatus and method for performing passive geophysical prospecting. More particularly, the present invention relates to an improved apparatus and method for locating and selected subsurface Earth material deposits or geologic formations ... | 07/08/2008 |
| 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 |
| 7298147 | Device and process for determination of the resistivity of a formation surrounding a cased borehole Body (22) for measuring the resistivity of a formation (9) surrounding a well (10) equipped with a lining (11), comprising: a body (23) of a probe (22), a set of three primary voltage measurement electrodes (ea, eb, ec), an ... | 11/20/2007 |
| 7295013 | Remotely operable measurement system and method employing same A marine measurement system is disclosed for obtaining measurements in an underwater operating environment. The system includes a base structure having a top surface, a bottom surface, and cavities provided therebetween. The cavities are also open to the top surface... | 11/13/2007 |
| 7280919 | Earthquake prediction method and system thereof Vehicles or ships each carry a magnetic force line sensor, a GPS position detector, and a data transmitter and travel within an observation area transmitting magnetic field data and position data to an earthquake prediction center. A telluric current induction field... | 10/09/2007 |
| 7277806 | Method for removing air wave effect from offshore frequency domain controlled-source electromagnetic data A method for removing the air wave effect from offshore frequency domain controlled source electromagnetic survey data. The region of interest is modeled with (111) and without (113) a top air layer. The electromagnetic field due to the source is compu... | 10/02/2007 |
| 7268557 | Method and apparatus for predicting seismic events The method for predicting seismic events includes supplying electricity by means of a detection unit (3) fitted with current electrodes (A, B) and potential probes (M, N) arranged in the ground and detecting electrical current and induced potentials by means ... | 09/11/2007 |
| 7259564 | Method and device for determining the position of an interface in relation to a bore hole The invention concerns a method for determining the position, in a formation (1) containing at least one electrolytic liquid, of an interface (6) in relation to a bore hole (2). One stimulates at a first instant the interface (6) with an ... | 08/21/2007 |
| 7227362 | Electric power grid induced geophysical prospecting method and apparatus An underground prospecting method and apparatus that utilizes the harmonics and fractional harmonic waves induced into the earth by the electric power grid. The data are converted to amplitude-depth and phase-depth data. The resulting data may be plotted and are com... | 06/05/2007 |
| 7116108 | Method and system for seafloor geological survey using vertical electric field measurement A system for mapping electrical conductivity of the seafloor incorporates a plurality of data logging units, where each unit (100) is an assembly adapted for deployment at a location on the seafloor for measurement of horizontal electric and magnetic fields. ... | 10/03/2006 |
| 7109717 | System and method for hydrocarbon reservoir monitoring using controlled-source electromagnetic fields The system and method for real-time monitoring of a hydrocarbon reservoir (4) during extraction include an electro-magnetic source assembly (16) for transmitting a first plurality of electromagnetic fields. A plurality of seafloor antennae (30 | 09/19/2006 |
| 7088048 | Device and process for switching and controlling an electron dose emitted by a micro-emitter This invention relates to a device for switching and controlling an electron dose emitted by a micro-emitter comprising a sensor module (30) that receives the output current from the micro-emitter and a voltage to adjust the... | 08/08/2006 |
| 7057974 | Device for sensing seismic and acoustic vibrations A device for sensing seismic and/or acoustic vibrations, has a body of a particulate material composed of a plurality of individual particles, and a system for determining changes in electrical conductivity of the particulate material caused by seismic and acoustic ... | 06/06/2006 |
| 7023213 | Subsurface conductivity imaging systems and methods A subsurface imaging cable includes a plurality of sensor modules, wherein the plurality of the sensor modules are flexible and each of the plurality of the sensor modules is spaced apart on the subsurface imaging cable at a selected distance; and a flexible medium ... | 04/04/2006 |
| 7005850 | Magnetic sensor system and method for installing magnetic sensors A magnetic sensor system and a method for installing magnetic sensors for detecting metal objects that allows ease of manipulation, control and access. A carrier conduit is used to position a magnetic sensor in an outer conduit. The outer conduit may be disposed ben... | 02/28/2006 |
| 7002349 | Remote sensing electric field exploration system An airborne exploration system used with an aircraft for shallow and deep exploration for oil and gas, mineral deposits and aquifers. The survey system uses natural electromagnetic EM fields as an energy source. The exploration system includes a pair of aerodynamic ... | 02/21/2006 |
| 6959245 | Soil and topography surveying Methods of characterizing subsurface conditions in a selected geographic region previously associated as a whole with a specific subsurface material characteristic reference profile such as from a USDA-NRCS soil survey. The method includes deploying a sensing tool a... | 10/25/2005 |
| 6950747 | Methods of processing magnetotelluric signals A method for processing magnetotelluric signals to identify subterranean deposits is provided for. The methods comprise obtaining magnetotelluric data from an area of interest. The magnetotelluric data comprises the amplitude of magnetotelluric signals recorded over... | 09/27/2005 |
| 6937190 | Electromagnetic impulse survey apparatus and method A passive geophysical prospecting method and apparatus are provided. The apparatus has an antenna for detecting electromagnetic radiation naturally emanating from the Earth's surface and generating an electrical signal from the detected electromagnetic radiation whi... | 08/30/2005 |
| 6842006 | Marine electromagnetic measurement system A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations including a central structure and arms attached to the central structure so that they can pivot relative to the central structure. An electrode is attached to th... | 01/11/2005 |
| 6819113 | Precision grid survey apparatus and method for the mapping of hidden ferromagnetic structures The present invention is for a precision grid surveyor having a stationary unit and a roving unit. The stationary unit has a light source unit that emits a light beam and a rotator to project the light beam toward detectors on a roving unit. The roving unit moves ov... | 11/16/2004 |
| 6712139 | Method of well casing cathodic protection optimization using the drill stem data A method of cathodic current optimization measures drill stem resistances along a well hole being drilled, correlates the drill stem resistances to respective types of underground formations at corresponding positions along the well hole, predicts a respective posit... | 03/30/2004 |
| 6577130 | System and method for sensing and controlling potential differences between a space object and its space plasma environment using micro-fabricated field emission devices A sensor and method for measuring an electrical potential difference are described. The sensor includes a micro-fabricated field emission device situated in a space plasma environment. The field emission device has an emitter terminal and a gate terminal.... | 06/10/2003 |
| 6512356 | Apparatus and method for determining electrical polarization of distribution of a vessel Apparatus for determining the distribution of the electric polarization of a vessel in water, comprises an array of electric potential sensors (22) which are located in the water beneath the vessel and each generates a signal corresponding to the amplitud... | 01/28/2003 |
| 6414492 | Method and apparatus for passive detection of geophysical discontinuities in the earth An apparatus and method for passively determining physical characteristics of subterranean geological formation which for example bear oil or gas or commercial important ore deposits such as precious metals. The apparatus includes an antenna for acquiring... | 07/02/2002 |
| 6405143 | Method and system for determining potential fields A method for determing the potential in a three-dimensional domain containing a source domain of source particles and a target domain of target particles involves assigning the source particles into source particle clusters and the target particles into t... | 06/11/2002 |
| 6087833 | Passive geophysical prospecting apparatus and method based upon detection of discontinuities associated with extremely low frequency electromagnetic fields An apparatus and method for passively determining the depth and thickness of a subterranean geologic formation bearing hydrocarbons, e.g., oil and/or gas, or commercially important ore deposits, e.g., precious metals. The apparatus has an antenna to pick ... | 07/11/2000 |
| 6037776 | Method and apparatus for geophysical exploration using GMR sensors An instrument for geophysical measurement of magnetic field strength, using a GMR sensor is provided. The instrument achieves high sensitivity across a relatively wide bandwidth in an instrument which is small and lightweight. The instrument makes it feas... | 03/14/2000 |
| 5838157 | Device for measuring electrical field gradient componets of the soil An apparatus for measuring the vertical component of the gradient of the electrical field of the soil surface includes two electrodes. Each electrode includes a capacitor with a semiconductor layer.... | 11/17/1998 |
| 5811974 | Tectonic activity monitoring equipment The present invention relates to realize a tectonic activity monitoring equipment providing apparatus and method to detect a feeble electromagnetic wave occurred by the tectonic activity with a high signal-to-noise ratio (S/N) and to predict earthquake an... | 09/22/1998 |
| 5783945 | Earthquake forecast method and apparatus with measurement of electrical, temperature and humidity parameters of soil An apparatus and a method for predicting an earthquake are disclosed. The apparatus employs a set of two electrodes for measuring the vertical component of the gradient of the electrical field due to the capillary movement and the surface evaporation of t... | 07/21/1998 |
| 5777478 | Passive geophysical prospecting apparatus and method based upon detection of discontinuities associated with extremely low frequency electromagnetic fields An apparatus and method for passively determining the depth and thickness of a subterranean geologic formation bearing hydrocarbons, e.g., oil and/or gas, or commercially important ore deposits, e.g., precious metals. The apparatus has an antenna to pick ... | 07/07/1998 |
| 5745384 | System and method for detecting a signal in a noisy environment A system and method are disclosed for detecting an event-related signal among noise, where the system includes memory for storing measurement values and may include a processor for generating residual values associated with the measurement values, and for... | 04/28/1998 |
| 5694129 | Method of imminent earthquake prediction by observation of electromagnetic field and system for carrying out the same A seismic electromagnetic field signal is detected at each of observation stations installed at at least two places, and civil noise and atmospheric discharge noise are eliminated from the signal to obtain a low-frequency seismic electromagnetic field sig... | 12/02/1997 |
| 5497091 | Surface mounted pH sensor for cone penetration testing A surface-mounted pH sensor provides continuous pH profiling with depth during standard cone penetration testing (CPT). The pH sensor includes at least two electrodes, one being an antimony electrode and the other being a ceramic electrode. The electrodes... | 03/05/1996 |
| 5440226 | Process and apparatus using magnetic field measurements for measuring an electric field in a conductive medium The apparatus includes a pair of electrodes which makes it possible to channel a current density creating the current which induces a magnetic field in one or more induction coils. This magnetic field is measured with the aid of one or more magnetometric ... | 08/08/1995 |
