Xinyou Y Lu

US Patent:

7536262, May 19, 2009

Filed:

Apr 26, 2005

Appl. No.:

11/597594

Inventors:

Scott Hornbostel - Houston TX, US
Xinyou Lu - Missouri City TX, US

Assignee:

ExxonMobil Upstream Research Company - Houston TX

International Classification:

G01V 3/38
G01V 1/50
G01V 1/24
G01V 1/28
G01V 1/48
G06F 19/00
G06F 17/40

US Classification:

702 17, 7315201, 7315202, 166248, 175 41, 175 50, 324333, 324334, 324344, 702 6, 702 7, 702 11, 702 14, 702187, 702190, 702194

Abstract:

A method for tracking a sinusoidal electromagnetic signal in noisy data using a Kalman filter or other tracking algorithm. The method is useful for controlled source electromagnetic surveying where longer source-receiver offsets can cause the source signal to decay significantly and be difficult to retrieve from magnetotelluric or other electromagnetic background.

US Patent:

7539279, May 26, 2009

Filed:

Apr 20, 2005

Appl. No.:

11/587420

Inventors:

Xinyou Lu - Missouri City TX, US
Leonard J. Srnka - Bellaire TX, US

Assignee:

ExxonMobil Upstream Research Company - Houston TX

International Classification:

H04L 23/00

US Classification:

375377, 375239, 181101, 181106, 181118, 3408531, 3408546, 324323

Abstract:

Waveforms for controlled source electromagnetic surveying. The waveforms have frequency spectra that include three or more frequencies spaced at substantially equal intervals on a logarithmic frequency scale and spanning a bandwidth of about one decade or more, at least three of which frequencies have approximately equal corresponding amplitudes.

US Patent:

7541996, Jun 2, 2009

Filed:

Dec 6, 2004

Appl. No.:

10/588932

Inventors:

Brian J. Fielding - Richmond TX, US
Xinyou Lu - Missouri City TX, US

Assignee:

ExxonMobil Upstream Research Company - Houston TX

International Classification:

H01Q 1/04

US Classification:

343719, 343795

Abstract:

System and method for maintaining vertical alignment of the electrodes of a dipole antenna as it is towed submerged in water. The system includes a source of vertical tension on the antenna, a towline attachable to a tow vessel at one end and to a negatively buoyant tow body at the other, a source of balancing force to make the net vertical force on the antenna when submerged substantially zero, and at least two tag lines used in specified ways to connect the antenna to the tow body or directly to the towline.

US Patent:

7593815, Sep 22, 2009

Filed:

Jan 17, 2006

Appl. No.:

11/793121

Inventors:

Dennis E. Willen - Houston TX, US
Xinyou Lu - Missouri City TX, US

Assignee:

ExxonMobil Upstream Research Company - Houston TX

International Classification:

G01F 19/00

US Classification:

702 6, 324500

Abstract:

A method, apparatus and computer program for improving the signal-to-noise ratio of a signal S(t), S(t) containing Signal and noise, are disclosed. A measurement of S(t) at a frequency-of-interest is obtained. Noise measurements of S(t) at one or more noise frequencies where the Signal portion of S(t) is expected to be small are obtained. The noise at the frequency-of-interest is estimated using the noise measurements at the one or more noise frequencies. The estimated noise is subtracted from the measurement of S(t) at the frequency-of-interest.

US Patent:

7840356, Nov 23, 2010

Filed:

Jun 28, 2006

Appl. No.:

11/922814

Inventors:

Xinyou Lu - Missouri City TX, US

Assignee:

ExxonMobil Upstream Research Co. - Houston TX

International Classification:

G01V 3/38

US Classification:

702 11, 702 70, 702191

Abstract:

Method for completely specifying orientation of electromagnetic receivers dropped to the ocean bottom in an electromagnetic survey. Survey data are selected, rejecting noisy data with long offsets and data where the receiver has saturated with short offsets (). A model is developed comprising three independent receiver orientation angles completely specifying the receiver orientation in three dimensions, and an earth resistivity model including a water layer and possibly an air layer (). Maxwell's equations, applied to the model and the selected data, are then inverted to determine the receiver orientations ().

US Patent:

7894989, Feb 22, 2011

Filed:

May 8, 2006

Appl. No.:

11/920676

Inventors:

Leonard J. Srnka - Bellaire TX, US
Xinyou Lu - Missouri City TX, US
Olivier M. Burtz - Houston TX, US

Assignee:

ExxonMobil Upstream Research Co. - Houston TX

International Classification:

G01V 3/00
G01V 1/28

US Classification:

702 2, 702 11, 702 38, 367117, 367106, 367 23, 324329, 324365

Abstract:

A method is disclosed for determining earth vertical electrical anisotropy from offshore electromagnetic survey measurements. The method requires both online and offline data, which includes at least one electromagnetic field component sensitive at least predominantly to vertical resistivity and another component sensitive at least predominantly to horizontal resistivity. Using a horizontal electric dipole source, online Eand offline Hmeasurements are preferred. For a horizontal magnetic dipole source, online Hand offline Edata are preferred. magnetotelluric data may be substituted for controlled source data sensitive to horizontal resistivity. Maxwell's equations are solved by forward modeling or by inversion, using resistivity models of the subsurface that are either isotropic or anisotropic.

US Patent:

7933741, Apr 26, 2011

Filed:

Jul 10, 2009

Appl. No.:

12/501251

Inventors:

Dennis E. Willen - Houston TX, US
Xinyou Lu - Missouri City TX, US

Assignee:

ExxonMobil Upstream Research Co. - Houston TX

International Classification:

G06F 19/00

US Classification:

702181

Abstract:

A method, apparatus and computer program for improving the signal-to-noise ratio of a signal S(t), S(t) containing Signal and noise, are disclosed. A measurement of S(t) at a frequency-of-interest is obtained. Noise measurements of S(t) at one or more noise frequencies where the Signal portion of S(t) is expected to be small are obtained. The noise at the frequency-of-interest is estimated using the noise measurements at the one or more noise frequencies. The estimated noise is subtracted from the measurement of S(t) at the frequency-of-interest.

US Patent:

7979211, Jul 12, 2011

Filed:

Jul 5, 2007

Appl. No.:

12/304699

Inventors:

Xinyou Lu - Missouri City TX, US
Dennis E. Willen - Houston TX, US

Assignee:

ExxonMobil Upstream Research Co. - Houston TX

International Classification:

G01V 1/48
G01V 1/46
G01V 3/00
G01R 13/02
G01R 23/00

US Classification:

702 16, 702 13, 702 68, 702 76, 324365

Abstract:

Method and computer program for accepting controlled-source electromagnetic (“CSEM”) source and receiver data () as time series, transforming these data into the time-frequency domain, and reducing these data and survey metadata to a form suitable for interpretation or inversion. The invention includes: a number of processing tools or programs (), each designed to take a specific action on CSEM data or metadata, combine data types in some way, and/or provide a visual representation of data; a Graphical User Interface () to specify the action of specific tools () on specific data, supply parameters to tools, and monitor progress of the processing project; and a specified common internal data format, so that processing tools may be applied in various orders () during different processing flows and processed CSEM data can be passed on to interpretation or inversion systems.