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8981788 Capacitor power supply, voltage monitoring device, method of monitoring voltage, and method of manufacturing capacitor power supply  
In a calibration process, a capacitor unit is removed from end terminals, or namely, respective capacitors are not connected to terminals. A prescribed voltage (a known voltage) is applied between...
8922214 Electromagnetic geophysical survey systems and methods employing electric potential mapping  
The present disclosure describes various geophysical survey systems and methods for mapping an electric potential field. At least one illustrative embodiment includes an electromagnetic (EM)...
8810248 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 time varying current to flow between at...
8736269 Electromagnetic geophysical survey systems and methods employing electric potential mapping  
The present disclosure describes various geophysical survey systems and methods for mapping an electric potential field. At least one illustrative embodiment includes an electromagnetic (EM)...
8729903 Method for remote identification and characterization of hydrocarbon source rocks using seismic and electromagnetic geophysical data  
Method for assessing hydrocarbon source rock potential of a subsurface region without well log information. The method uses surface electromagnetic (121) and seismic (122) survey data to obtain...
8717030 Controlling electromagnetic radiation in a data center  
Controlling electromagnetic (‘EM’) radiation in a data center having a number EM sections, including: receiving, by an EM controller, a specification of preferred EM radiation characteristics for...
8717031 Controlling electromagnetic radiation in a data center  
Controlling electromagnetic (‘EM’) radiation in a data center having a number EM sections, including: receiving, by an EM controller, a specification of preferred EM radiation characteristics for...
8669766 Carbon aerogel based electrode for electric field measurements in water  
The present disclosure relates to methods and systems for detecting electric potential difference in water. A first electrode comprising a first electrode body is configured to be in electrical...
8638103 Electromagnetic logging between borehole and surface  
The present disclosure relates to determining a property, such as resistivity, of an earth formation. A transmitter is disposed in a wellbore penetrating the formation, and a plurality of...
8633702 Apparatus and method for actively balancing impedance of a resistivity measuring tool  
An apparatus for making a resistivity measurement of an underground formation surrounding a borehole is provided. The apparatus includes a conductive tool body, at least one current injector...
8614579 Active standoff compensation in measurements with oil-based mud resistivity imaging devices  
Disclosed is an apparatus for estimating a property of an earth formation penetrated by a borehole having a substantially non-conducting liquid. The apparatus includes: a downhole tool having a...
8598882 Method of monitoring a hydrocarbon reservoir  
A method of monitoring an extent of a hydrocarbon reservoir (2) below the earth's surface (4), includes the steps of applying a current between a bottom current electrode (6) and a top current...
8575938 Electrical power system for towed electromagnetic survey streamers  
A marine electromagnetic receiver cable includes a plurality of signal processing modules disposed at spaced apart locations along the receiver cable. A power supply line is connected to each of...
8575937 Method and apparatus for utilizing time division multiple waveform transmitting  
A method and apparatus of constructing a signal for a controlled source electromagnetic survey is described. In one embodiment, a method is described that includes determining a first waveform and...
8482287 Method of determining electrical anisotropy in a subsurface formation  
Method of determining electrical anisotropy in a subsurface formation, wherein electromagnetic field data from a multi-offset electromagnetic survey obtained by using an electromagnetic source and...
8476915 Apparatus and method for determining the type of electromagnetic wave generating source  
An apparatus for determining a type of an electromagnetic wave generating source, including: a measurement unit that measures electromagnetic field strength at first and second measurement points...
8390295 Method and apparatus for focusing in resistivity measurement tools using independent electrical sources  
A system for measuring a resistivity parameter of an earth formation includes: at least one measurement electrode electrically connected to a first electrical source; at least one guard electrode;...
8390294 Multi-resolution borehole resistivity imaging  
An apparatus, method and computer-readable medium for obtaining a resistivity image of an earth formation. The apparatus includes a downhole assembly configured to be conveyed in a borehole...
8274288 Multi-transient DC resistivity measurements  
A method for measuring resistivity variations in the earth comprising passing a transient current between two source electrodes; measuring the transient current at the source electrodes; measuring...
8228066 Instrument for measuring electromagnetic signals  
A device and method for measuring electromagnetic signals that can be used to take measurements at or near the sea floor. The device comprises a central housing, a data management system located...
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...
8115491 Providing a tow cable having plural electromagnetic receivers and one or more electromagnetic sources  
To perform marine electromagnetic (EM) surveying of a subterranean structure, a marine cable system is provided including a tow cable, a plurality of electromagnetic (EM) sources coupled to the...
8115490 Concentric return and transmitter electrodes for imaging and standoff distances compensation  
A method of estimating a property of an earth formation penetrated by a borehole includes: disposing into the borehole a sensor having a plurality of return electrodes and at least one transmitter...
8076942 Method for marine electrical survey of oil-and-gas deposits  
A method for survey of hydrocarbon deposits in a researched profile of sea-bottom comprises providing a generator generating pulse electric current with a generator frequency in a towable...
8072222 Signal generator for electromagnetic surveying that produces a signal having an analog continuous waveform  
To perform an electromagnetic (EM) surveying of a subterranean structure, a signal generator produces a signal having an analog continuous waveform without steps in the waveform. Producing the...
8008920 Method and apparatus for utilizing time division multiple waveform transmitting  
A method and apparatus of constructing a signal for a controlled source electromagnetic survey is described. In one embodiment, a method is described that includes determining a first waveform and...
7982465 Electromagnetic method on shallow water using a controlled source  
A method for analyzing acquired electromagnetic measurements (R) made at or in a sea (4) over a seafloor (1) with rock formations (3) having relatively low resistivity (ρ3) for detecting a...
7940050 System and method for measuring resistivity of an earth formation with correction for mud electrical properties  
A method for measuring a resistivity parameter of an earth formation is provided. The method includes: conveying a measurement current from at least one measurement electrode into the formation,...
7928733 Concentric buttons of different sizes for imaging and standoff correction  
A method of estimating standoff in a borehole through an earth formation, includes: disposing a sensor including a plurality of return electrodes and at least one transmitter electrode disposed in...
7855560 Analog front-end coherent in-phase demodulation data acquisition system for resistivity image tools  
A method and system for measuring formation resisitivity is achieved by introducing an electrical signal into the formation. The current of the introduced electrical signal is then sensed,...
7834632 Receiver streamer system and method for marine electromagnetic surveying  
A receiver streamer system for marine electromagnetic surveying includes a first streamer, and a second streamer disposed substantially parallel to and spaced apart from the first streamer. A...
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...
7812611 Shallow marine electromagnetic hydrocarbon prospecting  
A method for determining electrical properties of a submarine petroleum fluid-bearing formation (1) under overburden geological layers (2) of thickness (s) under a seafloor (3) of a sea. The...
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...
7746078 Method and system of calculating resistivity of an earth formation  
Calculating resistivity of an earth formation. At least some of the illustrative embodiments are systems including: a first current source current return (CSCR) pair, said first CSCR pair...
7733093 Method of and apparatus for measuring tensor resistivity  
An induction or propagation apparatus for performing measuring the tensor resistivity of a sample of matter includes a non-conductive, generally cylindrical tubular member adapted to receive the...
7692429 Electromagnetic detector for marine surveying  
A detector for underwater electromagnetic surveying is described. The detector comprises first, second, third and fourth electrodes which are arranged to define first, second and third electric...
7602191 Cable-type electromagnetic receiver system for subsurface exploration  
A marine electromagnetic survey cable includes a reference electrode extending substantially along the entire length of the cable. A plurality of spaced apart measuring electrodes is disposed...
7592814 Method for monitoring an area containing a subterranean resistive or conductive body, and for obtaining a volume of hydrocarbon therefrom  
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...
7427863 Method and system for calculating resistivity of an earth formation  
Method and system for calculating resistivity of an earth formation. At least some of the illustrative embodiments are methods comprising transmitting a current from a first current source,...
7397250 High resolution resistivity earth imager  
Phase-sensitive measurements are made by a resistivity imaging tool in a borehole having non-conductive mud in a conductive earth formation at a plurality of frequencies. From the phase sensitive...
7394258 High resolution resistivity earth imager  
Impedance measurements made by a galvanic resistivity tool in a borehole in an earth formation are corrected by a factor that depends on the mud conductivity and the mud dielectric constant....
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...
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...
7256574 Device for measuring electric current intensity  
A magnetic field generated by a primary winding (1) in which the current (i1) to be measured flows is balanced by a magnetic field of opposing direction generated by a secondary winding (2) in...
7132831 Electrode configuration for resistivity sounding  
Device for resistivity soundings on water covered subsurfaces including a Fixed Current Asymmetric Schlumberger electrode configuration with a first and second current electrode and a number of...
7109718 Underground exploration apparatus  
A current to be applied to a ground is defined as the sum of two sinusoidal waves having first and second frequency components. A signal to be used at the time of synchronous detection is defined...
7098664 Multi-mode oil base mud imager  
A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source—a current return pair, and one or more monitor electrodes not located between the...
7034539 Underground exploration apparatus, system and method  
The object of the present invention is to realize a low-invasive underground exploration apparatus, system, and method which are capable of specifying the kind, three-dimensional position, and...
7026820 Method and apparatus for minimizing direct coupling for downhole logging devices  
A method and apparatus for minimizing direct coupling between transmitters and receivers on a downhole logging tool are disclosed. One embodiment includes a transmitter, a bucking device, and a...

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