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| Number | Title | Issue Date |
| RE40321 | Remote reservoir resistivity mapping A method for surface estimation of reservoir properties, wherein location of and average earth resistivities above, below, and horizontally adjacent to the subsurface geologic formation are first determined using geological and geophysical data in the vicinity of th... | 05/20/2008 |
| RE39844 | Remote reservoir resistivity mapping A method for surface estimation of reservoir properties, wherein location of and average earth resistivities above, below, and horizontally adjacent to the subsurface geologic formation are first determined using geological and geophysical data in the vicinity of th... | 09/18/2007 |
| 7227363 | Determining formation anisotropy based in part on lateral current flow measurements Disclosed herein are methods and apparatus using one or more toroids to measure formation anisotropy and/or vertical conductivity. In one embodiment, a disclosed method comprises: inducing a current to flow through a conductive surface of a tool body into a surround... | 06/05/2007 |
| 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 |
| 7062383 | Method for predicting grain size distribution from the shape of a sedimentary body The internal properties of a water-lain sediment body can be determined from the shape of the deposit. One method comprises solving equations relating the shape of a sediment body to the flow field that produced the body and using the flow field to solve for the sed... | 06/13/2006 |
| 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 plurality of receivers, where signals may be directly coupled from the t... | 04/11/2006 |
| 6944546 | Method and apparatus for inversion processing of well logging data in a selected pattern space Method and apparatus for deriving information regarding a subsurface geophysical formation. Well logging data is acquired for the subsurface geophysical formation. Geometrical parameters for the subsurface geophysical formation are determined by inversion processing... | 09/13/2005 |
| 6664788 | Nonlinear electroseismic exploration A method for seismic exploration using nonlinear conversions between electromagnetic and seismic energy, with particular attention to the electromagnetic source waveform used. According to the invention, seismic returns from a source waveform are correlat... | 12/16/2003 |
| 6603313 | Remote reservoir resistivity mapping A method for surface estimation of reservoir properties, wherein location of and average earth resistivities above, below, and horizontally adjacent to the subsurface geologic formation are first determined using geological and geophysical data in the vic... | 08/05/2003 |
| 6411095 | Apparatus and method for locating an object The invention is directed to an apparatus and method for locating objects in a body through the mapping and imaging of the conductivity profiles of such objects by applying a force to the object and/or body and measuring certain characteristics of the bod... | 06/25/2002 |
| 5825188 | Method of mapping and monitoring groundwater and subsurface aqueous systems An electromagnetic method is disclosed that can be used to map, track, and monitor subsurface water or solutions and related geologic structure including: groundwater, groundwater channels, groundwater structures, subsurface pollution plumes, locate the s... | 10/20/1998 |
| 5563513 | Electromagnetic imaging device and method for delineating anomalous resistivity patterns associated with oil and gas traps A method and apparatus used in providing resistivity measurement data of a sedimentary subsurface for developing and mapping an enhanced anomalous resistivity pattern. The enhanced subsurface resistivity pattern is associated with and an aid for finding o... | 10/08/1996 |
| 5444374 | Method and apparatus for simultaneously collecting spatially and temporally varying magnetic survey data A method and a device for implementing the method, for geophysical surveying of an area (1) including continuous measurement of the earth's magnetic and electromagnetic field using a detector (6) held at a constant height (E) above the ground surface, in ... | 08/22/1995 |
| 5430380 | Sensor for locating objects in the sea having a conductive shell to inject electric current into the sea and a sensor coil in the shell A sensor for sensing the location of objects buried in the loose sediment in the bed of the sea. A hollow, cylindrically symmetric, conductive shell is used to inject current into seawater at its tips along its axis. A sensor coil oriented along the axis ... | 07/04/1995 |
| 5359324 | Well logging apparatus for investigating earth formations A logging-while-drilling system is disclosed in which a first subassembly is included near the drill bit, and this subassembly comprises a conducting body with measuring means disposed in it and a first toroidal coil antenna disposed on the body, means fo... | 10/25/1994 |
| 4901023 | Methods and apparatus for measurement of low frequency a.c. magnetic fields within cased boreholes to determine properties of geological formations This invention relates to the measurement of the longitudinal components of low frequency A.C. magnetic fields from within cased boreholes which are used to measure the geophysical properties of geological formations. The applied A.C. magnetic fields are ... | 02/13/1990 |
| 4079309 | Method for determining changes in earth resistivity by measuring phase difference between magnetic field components Method and apparatus for detecting tunnels beneath an area of the earth's rface wherein an oscillator couples a current into a linear conductor at the earth's surface to generate a magnetic field in the earth beneath the area. Phase angle measuring means ... | 03/14/1978 |
| 3959721 | Method employing D.C. pulses for the detection of disseminated or massive mineralization within the earth crust by producing an A.C. electromagnetic field Pulses of direct current are applied to the ground by means of a pair of electrodes or by means of a coil. These pulses produce an alternating current magnetic field if they are in the vicinity of a zone of mineralization. These secondary currents are mea... | 05/25/1976 |
