Jesse G Robison

US Patent:

58923624, Apr 6, 1999

Filed:

May 15, 1997

Appl. No.:

8/856879

Inventors:

Roy K. Warren - Houston TX
Jesse G. Robison - Missouri City TX

International Classification:

G01N 310

US Classification:

324339

Abstract:

The present invention involves service induction techniques to produce two-dimensional spatially continuous imaging of subsurface conditions for interpreting and verifying three-dimensional, spatially continuous imaging of subsurface conditions or for planning a survey using three-dimensional, spatially continuous imaging. A transmitter coil is placed in the surface of the earth with the axis of the core perpendicular to the surface of the earth. A surface probe including a horizontal coil and a vertical coil is located along the surface of the earth at a fixed offset from the transmitter. Application of an alternating current to a transmitter coil generates a primary magnetic field adjacent to the transmitter. Should the lines of force in the primary magnetic field intercept an intervening layer or area of contrasting resistivity or conductivity, an electromagnetic force is produced within the area of contrasting resistivity causing the contrasting layer to generate a secondary magnetic field between the surface probe and the area of contrasting resistivity. Both the primary and secondary coils induce corresponding signals in the horizontal and vertical coils of the surface probe.

US Patent:

56525192, Jul 29, 1997

Filed:

Mar 18, 1996

Appl. No.:

8/620757

Inventors:

Roy K. Warren - Houston TX
Jesse G. Robison - Houston TX

International Classification:

G01V 310

US Classification:

324339

Abstract:

Methods and apparatus for measuring pollutants contaminating earth formation. Specifically, the invention involves the three dimensional, spatially continuous imaging of sub surface conditions using electromagnetic induction techniques. The technique utilizes the resistivity of near surface volumes of earth formation in order to determine and graphically represent the magnitude and migration of pollutants. Included in the invention are the logging techniques and apparatus as well as the method of converting the captured data into a pseudo resistivity log suitable for a three dimensional imaging of sub surface conditions.