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| Number | Title | Issue Date |
| 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 |
| 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 |
| 7852088 | High resolution magnetotelluric method for removing static frequency domain A method for removing a static frequency domain, by (1) installing multiple sampling devices; (2) performing conventional processing whereby obtaining conventional observation curves; (3) adding electric-filed components of two adjacent observation points, those of ... | 12/14/2010 |
| 7800373 | Method for correcting magnetic based orientation measurements for local biasing fields A method of determining an orientation of a data acquisition system deployed on a seafloor includes measuring horizontal magnetic fields using detectors on the data acquisition system while the data acquisition rotates and descends to the seafloor or rises from the ... | 09/21/2010 |
| 7403858 | Method for detecting an occurrence zone of a mantle diapir finger location The invention covers the mining industry. Detection method of the occurrence zone of the mantle substance diapir finger consisting in that that geological observation are carried out in riftzones banked up by diapirs of the abnormal mantle and places of location of ... | 07/22/2008 |
| 7362102 | Electromagnetic surveying for resistive or conductive bodies A method of analyzing electromagnetic survey data from an area of seafloor 6 that is thought or known to contain a resistive or conductive body, for example a subterranean hydrocarbon reservoir 12, is described. The method includes providing horizontal... | 04/22/2008 |
| 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 |
| 7337064 | Electromagnetic surveying for hydrocarbon reservoirs An electromagnetic survey method for surveying an area of seafloor that is thought or known to contain a subterranean hydrocarbon reservoir, comprising obtaining a first survey data set with a vertical electric dipole (VED) antenna for generating vertical current lo... | 02/26/2008 |
| 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 |
| 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 |
| 7221164 | Airborne remote sensing electric field exploration system An airborne exploration system used with an aircraft for exploration of oil and gas, mineral deposits and aquifers. The survey system uses natural electromagnetic EM fields as an energy source. The exploration system includes at least one non-directional, wideband, ... | 05/22/2007 |
| 7141968 | Integrated sensor system for measuring electric and/or magnetic field vector components A compact sensor system integrates electric and/or magnetic field sensors to accurately measure, with a high level of sensitivity, one or more electric and magnetic vector components of fields. The electric and magnetic field data can be utilized separately or combi... | 11/28/2006 |
| 7126338 | Electromagnetic surveying for hydrocarbon reservoirs An electromagnetic survey method for surveying an area previously identified as potentially containing a subsea hydrocarbon reservoir, comprising obtaining first and second survey data sets with an electromagnetic source aligned end-on and broadside relative to the ... | 10/24/2006 |
| 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 |
| 7106065 | Method of geologic exploration for subsurface deposits A method of geologic exploration for subsurface deposits includes the steps of: emitting energy below a surface of the earth; sensing a plurality of reactive electro-magnetic waves resulting from the emitted energy; outputting signals from a plurality of sensors to ... | 09/12/2006 |
| 7043366 | Method for enhancing depth and spatial resolution of one and two dimensional residual surfaces derived from scalar potential data An improved method is disclosed for collecting or assembling scalar potential data measurements that are to be subsequently prepared as a surface representation for analysis via frequency domain transform filters. Measurements are made over a geographic reference re... | 05/09/2006 |
| 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 |
| 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 |
| 7002350 | Marine oil and gas exploration system using telluric currents as a natural electromagnatic energy source A marine oil and gas exploration system used for measuring telluric currents as a natural electromagnetic energy source flowing beneath an ocean and sea floor. The marine exploration system includes a towed fish adapted for being pulled behind a survey ship. The coo... | 02/21/2006 |
| 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 |
| 6913854 | Method and apparatus for generating power from voltage gradients at sediment-water interfaces A method and apparatus for generating power from voltage gradients at sediment-water interfaces or within stratified euxinic water-columns is provided. Natural voltage gradients typically exist at and about sediment-water interfaces or in isolated water bodies. One ... | 07/05/2005 |
| 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 |
| 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 |
| 6466021 | Deep underground imaging utilizing resistivity regularization for magnetotelluric processing A method and apparatus for imaging deep underground objects utilizes the application of a spectral regularization routine that is applied to measured data prior to the application of an inversion routine to measured surface impedances to map subsurface co... | 10/15/2002 |
| 6191587 | Satellite synchronized 3-D magnetotelluric system A method of data acquisition for geophysical surveys. The method includes the steps of providing a least one magnetic sensor unit for sensing and recording magnetic field fluctuations; providing a plurality of electric sensor units for sensing and recordi... | 02/20/2001 |
| 5770945 | Seafloor magnetotelluric system and method for oil exploration The magnetotelluric system for seafloor petroleum exploration comprises a first waterproof pressure case containing a processor, AC-coupled magnetic field post-amplifiers and electric field amplifiers (the "logger unit"), a second waterproof pressure case... | 06/23/1998 |
| 5327089 | Portable assembly for supporting magnetic and electrical sensors A portable underwater mount for magnetic and electric field sensors. The mount has a gimbal-like structure comprising a ball member having a mounting flange for coupling to the magnetometer. The ball member is cast from polyurethane with Teflon powder sus... | 07/05/1994 |
| 5105894 | Method and apparatus for orientating core sample and plug removed from sidewall of a borehole relative to a well and formations penetrated by the borehole A method and apparatus for determining the location in space of a formation sample is set forth. This involves a tool which is typically run on a wireline in a well, the tool supporting orthogonal positioned magnetometers and similar orthogonal accelerome... | 04/21/1992 |
| 5043667 | Method of magnetotelluric exploration using areal arrays A method of magnetotelluric exploration is described, wherein measures of the earth's electric and magnetic fields are obtained at a plurality of sensing locations comprising an areal array of sensing locations. Specifically, first and second components o... | 08/27/1991 |
| 5041792 | Electrodes incorporating intercalation compounds for mangetotelluric, electroseismic and other electrical survey applications A low noise, magnetotelluric, intercalation electrode is disclosed that is both electronically and ionically conductive and stable in ground water brine. The electrode is comprised of an inert or chemically inactive long cylindrical and porous support shi... | 08/20/1991 |
| 4939460 | Indigenous electromagnetic radiation based method for detecting geologic deposits A method for detecting a geologic deposit of a selected substance. In the method, the intensity of the local geomagnetic field at one or more measurement sites at a first location is resolved. During selected time intervals, at each site, the amplitude of... | 07/03/1990 |
| 4862089 | Method of magnetotelluric exploration using a zigzag array The present invention relates generally to a method of geophysical exploration and more particularly to a novel method of magnetotelluric exploration. In one embodiment, a series of continuous electric dipole measurements of one component of the earth's e... | 08/29/1989 |
| 4835473 | Method using a d.c. source for determining resistivity distribution of the earth as a function of depth An electromagnetic survey method for geophysical exploration, in which the variations in the earth's magnetic field are measured in two, non-parallel directions at one point in the survey area. Simultaneously, the variations in the earth's electrical fiel... | 05/30/1989 |
| 4811220 | Method for visual display and analysis of subsurface rock properties and structure utilizing colored magnetotelluric transfer functions A three-dimensional display and interpretation technique, in which magnetotelluric survey and modeling data are transformed and compared in order to yield a remotely determined picture of subsurface rock properties and structure, is disclosed. Normalized ... | 03/07/1989 |
| 4792761 | Geophysical prospecting with collimated magnetotelluric fields An electromagnetic survey system for geophysical exploration comprising a reconnaissance method and a survey line method. The reconnaissance method finds the principal electrical axis of conductivity of anomalous zones of conductivity by measurement of va... | 12/20/1988 |
| 4757262 | Method for geophysical exploration using electromagnetic array An electromagnetic survey method for geophysical exploration, in which the variations in the earth's magnetic field are measured in two, non-parallel directions at one point in the survey area. Simultaneously, the variations in the earth's electrical fiel... | 07/12/1988 |
| 4686476 | Plotting of magnetotelluric impedance to determine structure and resistivity variation of anomalies In magnetotelluric exploration, plots of equal values of the phase of the determinant of the impedance tensor relating the earth's electric fields to the earth's magnetic fields are plotted to distinguish the structure of resistivity anomalies and separat... | 08/11/1987 |
| 4616184 | CSAMT method for determining depth and shape of a sub-surface conductive object The depth to and size of an underground object may be determined by sweeping a CSAMT signal and locating a peak response when the receiver spans the edge of the object. The depth of the object is one quarter wavelength in the subsurface media of the frequ... | 10/07/1986 |
| 4591791 | Electromagnetic array profiling survey method An electromagnetic survey method for geophysical exploration, in which the variations in the earth's magnetic field are measured in two, non-parallel directions at one point in the survey area. Simultaneously, the variations in the earth's electrical fiel... | 05/27/1986 |
| 4473800 | Method for detecting magnetotelluric subsurface anomalies A method for removing the effects of said subsurface anomalies in magnetotelluric survey data is disclosed wherein resistivity curves are compared and a correction factor is determined. Resistivity curves having a deviation from a mean are multiplied by t... | 09/25/1984 |
