David M Alumbaugh

US Patent:

7471089, Dec 30, 2008

Filed:

Apr 24, 2006

Appl. No.:

11/379917

Inventors:

Andrea Zerilli - Fiorenzuola D'Arda, IT
Ugo Conti - El Cerrito CA, US
David Alumbaugh - Berkeley CA, US

Assignee:

Schlumberger Technology Corporation - Sugarland TX

International Classification:

G01V 3/02

US Classification:

324365

Abstract:

An electrode array for electric and magnetic measurements in a marine environment includes a first set of electrodes connected to a first cable, wherein the first set of electrodes and the first cable are configured to sink to a sea floor in the marine environment; a second set of electrodes connected to a second cable, wherein the second set of electrodes and the second cable are connected to the first cable and configured to float in the marine environment such that the second set of electrodes and the second cable maintain a distance from the sea floor when the first cable sits on the sea floor, and an instrument package connected to the first cable and the second cable, wherein the instrument package is configured to receive voltage signals measured by the first set of electrodes and the second set of electrodes.

US Patent:

7565244, Jul 21, 2009

Filed:

Jun 27, 2007

Appl. No.:

11/768975

Inventors:

David Alumbaugh - Berkeley CA, US
Ping Zhang - Albany CA, US
Edward Nichols - Berkeley CA, US
Frank Morrison - Berkeley CA, US
Aria Abubakar - North Reading MA, US
Tarek Habashy - Burlington MA, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 1/40

US Classification:

702 6, 702 7, 702 11, 324323, 324334, 324339, 367 29, 367 49

Abstract:

Characterizing a reservoir with electromagnetic imaging surveys includes normalizing measured voltage data by transmitter moment, sorting the normalized voltage data into common receiver profiles, densely resampling transmitter locations using common positions for the receiver profiles, coarsely resampling the data at discreet transmitter locations, defining a starting model for inversion, weighting the data by a factor, converting the normalized voltage data to ratios, calculating a conductivity image using a ratio inversion method, and verifying that an inversion has converged and the image is geologically reasonable. The image can then be displayed. The invention can be used for cross-well, surface-to-borehole, and borehole-to-surface measurements by which the effects of steel casing are reduced.

US Patent:

7657391, Feb 2, 2010

Filed:

Jul 14, 2006

Appl. No.:

11/457623

Inventors:

David Alumbaugh - Berkeley CA, US
Jiuping Chen - Albany CA, US
Frank Morrison - Berkeley CA, US

Assignee:

WesternGeco L.L.C. - Houston TX

International Classification:

G01V 3/00
G06F 19/00

US Classification:

702127

Abstract:

A technique includes performing first electromagnetic field measurements to obtain a first set of data and performing second electromagnetic field measurements to obtain a second set of data. The first set of data is relatively sensitive to an effect caused by an air layer boundary and is relatively insensitive to the presence of a resistive body. The second set of data is relatively insensitive to the effect and is relatively sensitive to the presence of the resistive body. The technique includes combining the first and second sets of data to generate a third set of data, which is relatively insensitive to the effect and is relatively sensitive to the presence of the resistive body.

US Patent:

7659724, Feb 9, 2010

Filed:

Mar 29, 2007

Appl. No.:

11/693275

Inventors:

David L. Alumbaugh - Berkeley CA, US
Jiuping Chen - Albany CA, US
Kevin Eyl - Lafayette CA, US
Stephen A. Horne - Lafayette CA, US
Edward Nichols - Berkeley CA, US

Assignee:

WesternGeco L.L.C. - Houston TX

International Classification:

G01V 3/08
G01V 3/15

US Classification:

324365

Abstract:

The survey technique for use in a marine environment to survey a subterranean structure includes providing an arrangement of plural signal sources in a body of water to produce corresponding signals. The signals of the signal sources in the arrangement are set to cause reduction of at least one predetermined signal component in data received by a receiver in response to the signals.

US Patent:

7860655, Dec 28, 2010

Filed:

Jul 18, 2007

Appl. No.:

11/779440

Inventors:

David Alumbaugh - Berkeley CA, US
Jiuping Chen - Albany CA, US
Huntly F. Morrison - Berkeley CA, US

Assignee:

WesternGeco L.L.C. - Houston TX

International Classification:

G01V 3/12
G06F 19/00
G06F 17/40

US Classification:

702 11, 7315202, 16625001, 324323, 702 7, 702187, 702189

Abstract:

A technique includes using a first sensor to perform a first electromagnetic field measurement to obtain first data, which is indicative of the presence of a resistive body. The first data is relatively sensitive to an effect that is caused by an air layer boundary. The technique includes using a second sensor to perform a second electromagnetic field measurement to obtain second data, which is indicative of the presence of the resistive body. The second data is relatively sensitive to the effect, and the first and second sensors are either both magnetic field sensors or both electric field sensors. The technique includes combining the first and second data to generate third data, which is relatively insensitive to the effect and is indicative of the presence of the resistive body.

US Patent:

7880469, Feb 1, 2011

Filed:

Dec 31, 2009

Appl. No.:

12/650791

Inventors:

David L. Alumbaugh - Berkeley CA, US
Jiuping Chen - Albany CA, US
Kevin Eyl - Lafayette CA, US
Stephen A. Horne - Lafayette CA, US
Edward Nichols - Berkeley CA, US

Assignee:

WesternGeco L.L.C. - Houston TX

International Classification:

G01V 3/15

US Classification:

324365

Abstract:

A survey technique for use in a marine environment to survey a subterranean structure includes providing an arrangement of plural signal sources in a body of water to produce corresponding signals. The signals of the signal sources in the arrangement are set to cause reduction of at least one predetermined signal component in data received by a receiver in response to the signals.

US Patent:

7884612, Feb 8, 2011

Filed:

Dec 22, 2005

Appl. No.:

11/315813

Inventors:

Ugo Conti - El Cerrito CA, US
Andrea Zerilli - Fiorenzuola d' Arda, IT
David Alumbaugh - Berkeley CA, US
Martin Howlid - Slependen, NO
Leendert Combee - Asker, NO
Kevin Eyl - Lafayette CA, US

Assignee:

WesternGeco L.L.C. - Houston TX

International Classification:

G01V 3/10
G01V 3/15

US Classification:

324365, 324332

Abstract:

A multi-component field source for surveying subsea formations includes at least two electrodes having a direction of motion, wherein the at least two electrodes are configured to produce an electric dipole in an orientation that is not parallel to both the direction of motion of the electrodes and the seafloor. A method for logging subsea formations includes transmitting electromagnetic energy into the subsea formations with at least two electrodes having a direction of motion and configured to produce an electric dipole in an orientation that is not parallel to both the direction of motion of the electrodes and the seafloor; and receiving signals that comprise electromagnetic energy that has traversed the subsea formations.

US Patent:

7949470, May 24, 2011

Filed:

Nov 21, 2007

Appl. No.:

11/943627

Inventors:

David Alumbaugh - Berkeley CA, US
Jiuping Chen - Albany CA, US
Kevin Eyl - Lafayette CA, US
Stephen Allan Horne - Tokyo, JP
Edward Nichols - Berkeley CA, US

Assignee:

WesternGeco L.L.C. - Houston TX

International Classification:

G01V 3/00

US Classification:

702 11, 324334

Abstract:

To process subterranean survey data, measurement data is collected by a receiver positioned in deep water, where the collected measurement data is responsive to signals emitted by at least one signal source located at or near an air-water interface of the body of water. The measurement data is processed to reduce a predetermined signal component.