James Joseph Carazzone

7333893, Feb 19, 2008

Feb 23, 2006

11/360303

Olivier M. Burtz - Houston TX, US
James J. Carazzone - Houston TX, US
Dmitriy A. Pavlov - The Woodlands TX, US

ExxonMobil Upstream Research Company - Houston TX

G01V 9/00
G01V 11/00

702 14, 702 7, 702 16

Method for removing effects of shallow resistivity structures in electromagnetic survey data to produce a low frequency resistivity anomaly map, or alternatively imaging resistivity structures at their correct depth levels. The method involves solving Maxwell's electromagnetic field equations by either forward modeling or inversion, and requires at least two survey data sets, one taken at the source frequency selected to penetrate to a target depth, the other a higher frequency able to penetrate only shallow depths.

7769572, Aug 3, 2010

Aug 27, 2002

10/228453

Leonard J. Srnka - Houston TX, US
James J. Carazzone - Houston TX, US

ExxonMobil Upstream Research Co. - Houston TX

G06G 7/56

703 5, 324338, 367 31

This invention relates generally to a method of simulating the signal of an electromagnetic source using one or more dipole sources. In the method a dipole source is located at an excitation location corresponding to a segment of the electromagnetic source to be simulated. The dipole source is activated, and an electromagnetic signal recorded at one or more receiver locations. This process is repeated for additional excitation locations corresponding to additional segments of the electromagnetic source. The data from the sequence of dipole source excitation locations is processed to determine the simulated signal of the electromagnetic source.

7801681, Sep 21, 2010

Sep 25, 2006

12/083883

Dmitriy A. Pavlov - The Woodlands TX, US
Dennis E. Willen - Houston TX, US
James J. Carazzone - Houston TX, US

ExxonMobil Upstream Research Co. - Houston TX

G01V 1/40

702 7

The method for correcting the phase of measured electric signals or magnetic signals of field data from a controlled source electromagnetic survey (CSES) by comparing the measured field data corresponding to a selected frequency to the simulated data for various signal source receiver offsets () and correcting the phases of the actual data based on the phase difference for a selected range of small signal offsets () based on a go-electric model.

7808420, Oct 5, 2010

Oct 25, 2007

12/438525

James J. Carazzone - Houston TX, US

ExxonMobil Upstream Research Co. - Houston TX

G06F 19/00

342 6, 342179

Method for organizing computer operations on a system of parallel processors to invert electromagnetic field data () from a controlled-source electromagnetic survey of a subsurface region to estimate resistivity structure () within the subsurface region. Each data processor in a bank of processors simultaneously solves Maxwell's equations () for its assigned geometrical subset of the data volume (). Other computer banks are simultaneously doing the same thing for data associated with a different source frequency, position or orientation, providing a “fourth dimension” parallelism, where the fourth dimension requires minimal data passing (). In preferred embodiments, a time limit is set after which all processor calculations are terminated, whether or not convergence has been reached.

7987074, Jul 26, 2011

Feb 12, 2007

12/161991

James J. Carazzone - Houston TX, US
T. Edward Clee - Chappell Hill TX, US

ExxonMobil Upstream Research Company - Houston TX

G06F 17/50

703 2, 703 10, 166 53, 166 665, 166302

Method for efficient processing of controlled source electromagnetic data, whereby Maxwell's equations are solved [] by numerical techniques [] such as finite difference or finite element in three dimensions for each source location and frequency of interest. The Reciprocity Principle is used [] to reduce the number of computational source positions, and a multi-grid is used [] for the computational grid to minimize the total number of cells yet properly treat the source singularity, which is essential to satisfying the conditions required for applicability of the Reciprocity Principle. An initial global resistivity model [] is Fourier interpolated to the computational multi grids []. In inversion embodiments of the invention, Fourier prolongation is used to update [] the global resistivity model based on optimization results from the multi-grids.

8078439, Dec 13, 2011

Jun 8, 2010

12/796374

Leonard J. Srnka - Houston TX, US
James J. Carazzone - Houston TX, US

ExxonMobil Upstream Research Co. - Houston TX

G06G 7/56
G06G 7/48

703 5, 703 10, 703 2

This invention relates generally to a method of simulating the signal of an electromagnetic source using one or more dipole sources. In the method a dipole source is located at an excitation location corresponding to a segment of the electromagnetic source to be simulated. The dipole source is activated, and an electromagnetic signal recorded at one or more receiver locations. This process is repeated for additional excitation locations corresponding to additional segments of the electromagnetic source. The data from the sequence of dipole source excitation locations is processed to determine the simulated signal of the electromagnetic source.

8126650, Feb 28, 2012

Jun 13, 2007

12/304444

Xinyou Lu - Missouri City TX, US
James J. Carazzone - Houston TX, US

ExxonMobil Upstream Research Co. - Houston TX

G01V 3/38
G01V 3/00
G06F 19/00

702 11, 7315201, 7315202, 16625001, 702189

Method for efficient inversion of controlled-source electromagnetic survey data to obtain a resistivity model of the subsurface of the survey area. The method extracts the dimensions and location of sub-surface structures as they may be revealed by existing seismic or other available high resolution survey data from the subsurface area (). This structure geometry information is used to construct a discretization (grid, or mesh) for the inversion computation () that is different from the mesh used for the forward modeling calculations () in that (a) it has fewer and hence larger cells; and (b) the cells honor the assumed structural information. The inversion need only extract resistivity information (), the geometry of the resistive structures being specified by the inversion mesh.

8437961, May 7, 2013

Mar 6, 2007

12/280509

Leonard J. Srnka - Bellaire TX, US
James J. Carazzone - Houston TX, US
Dmitriy A. Pavlov - The Woodlands TX, US

ExxonMobil Upstream Research Company - Houston TX

G01V 1/40
G06F 11/30

702 7, 702127, 702182, 702189

Method for determining time-dependent changes [] in the earth vertical and horizontal electrical resistivity and fluid saturations from offshore electromagnetic survey measurements. The method requires both online and offline data, which should include at least one electromagnetic field component sensitive at least predominantly to vertical resistivity and another component sensitive at least predominately to horizontal resistivity []. Using a horizontal electric dipole source, online Ez and offline Hz measurements are preferred. For a horizontal magnetic dipole source, online H and offline E data are preferred. Magnetotelluric data may be substituted for controlled source data sensitive at least predominantly to horizontal resistivity. Maxwell's equations are solved by forward modeling [ or by inversion [, using resistivity models of the subsurface that are either isotropic contrast, and [ or anisotropic [. Fluid saturation is determined from the vertical and horizontal resistivities using empirical relations or rock physics models [.