Jack P Dvorkin

Author:

Jack Dvorkin

ISBN #:

0521543444

Author:

Jack Dvorkin

ISBN #:

0521620686

US Patent:

7088639, Aug 8, 2006

Filed:

Apr 2, 2005

Appl. No.:

11/098010

Inventors:

Joel Walls - Houston TX, US
M. Turhan Taner - Houston TX, US
Jack Dvorkin - Emerald Hills CA, US

Assignee:

RDSP I L.P. - Houston TX

International Classification:

G01V 1/28
G01V 1/00

US Classification:

367 73, 367 38, 702 14

Abstract:

A method for seismic characterization of subsurface Earth formations includes determining at least one of compressional velocity and shear velocity, and determining reservoir parameters of subsurface Earth formations, at least including density, from data obtained from a wellbore penetrating the formations. A quality factor for the subsurface formations is calculated from the velocity, the density and the water saturation. A synthetic seismogram is calculated from the calculated quality factor and from the velocity and density. The synthetic seismogram is compared to a seismic survey made in the vicinity of the wellbore. At least one parameter is adjusted. The synthetic seismogram is recalculated using the adjusted parameter, and the adjusting, recalculating and comparing are repeated until a difference between the synthetic seismogram and the seismic survey falls below a selected threshold.

US Patent:

8081796, Dec 20, 2011

Filed:

Nov 24, 2008

Appl. No.:

12/276432

Inventors:

Naum Derzhi - Sugar Land TX, US
Jack Dvorkin - Redwood City CA, US
Qian Fang - Houston TX, US
Zbigniew Wojcik - Houston TX, US

Assignee:

Ingrain, Inc. - Houston TX

International Classification:

G06K 9/00
G01N 23/04

US Classification:

382100, 382154, 378 53

Abstract:

A method for estimating a petrophysical parameter from a rock sample includes making a three dimensional tomographic image of the sample of the material. The image is segmented into pixels each representing pore space or rock grain. Porosity of the sample is determined from the segmented image. An image of at least one fracture is introduced into the segmented image to generate a fractured image. The porosity of the fractured image is determined. At least one petrophysical parameter related to the pore-space geometry is estimated from the fractured image.

US Patent:

8081802, Dec 20, 2011

Filed:

Nov 29, 2008

Appl. No.:

12/325151

Inventors:

Jack Dvorkin - Redwood City CA, US
Naum Derzhi - Sugarland TX, US
Meghan Armbruster - Houston TX, US
Qian Fang - Houston TX, US
Zbigniew Wojcik - Houston TX, US

Assignee:

Ingrain, Inc. - Houston TX

International Classification:

G06K 9/00
E21B 10/02

US Classification:

382109, 382224, 175249

Abstract:

A method for estimating permeability properties of a porous material from a sample thereof includes making a three dimensional tomographic image of the sample of the material. The image is segmented into pixels each representing pore space or rock grains. The image is divided into sub-volumes. A porosity is estimated for each sub-volume. The components of a permeability tensor are determined by conducting simulations. Principal permeability values and directions are then calculated. The permeability properties are stored in a computer or displayed.

US Patent:

8085974, Dec 27, 2011

Filed:

Nov 24, 2008

Appl. No.:

12/276952

Inventors:

Jack Dvorkin - Redwood City CA, US
Naum Derzhi - Sugarland TX, US
Zbigniew Wojcik - Houston TX, US

Assignee:

Ingrain, Inc. - Houston TX

International Classification:

G06K 9/00
A61B 6/00

US Classification:

382100, 382154, 378 21

Abstract:

A method for estimating at least one elastic-wave-related property of a porous material from a sample thereof includes making a three dimensional tomographic image of the sample of the material. The image is segmented into pixels each representing pore space or rock grain. Bulk modulus and shear modulus of the porous material are determined from the segmented image at a frequency corresponding to mobile fluid. Bulk modulus and shear modulus of the porous material are determined from the segmented image at a frequency corresponding to immobile fluid. The at least one elastic-wave-related property is determined from the mobile fluid and immobile fluid moduli. The method includes at least one of storing and displaying the at least one elastic-wave-related property so determined.

US Patent:

8155377, Apr 10, 2012

Filed:

Nov 24, 2008

Appl. No.:

12/276430

Inventors:

Jack Dvorkin - Redwood City CA, US
Naum Derzhi - Sugarland TX, US
Meghan Armbruster - Houston TX, US
Qian Fang - Houston TX, US
Zbigniew Wojcik - Houston TX, US

Assignee:

Ingrain, Inc. - Houston TX

International Classification:

G06K 9/00
E21B 10/02

US Classification:

382100, 382154, 175249

Abstract:

A method for estimating a relationship between physical properties of a porous material from a sample thereof includes making a three dimensional tomographic image of the sample of the material. The image is segmented into pixels each representing pore space or rock grains. The image is divided into sub-volumes. A porosity is estimated for each sub-volume. At least one petrophysical parameter is modeled from the image of each sub-volume. A relationship between the porosity and the at least one modeled petrophysical parameter is determined by, e. g. , a best-fit statistical method. The relationship and the modeled petrophysical parameter for each sub-volume are stored in a computer or displayed.

US Patent:

8170799, May 1, 2012

Filed:

Nov 24, 2008

Appl. No.:

12/276431

Inventors:

Jack Dvorkin - Redwood City CA, US
Naum Derzhi - Sugarland TX, US
Meghan Armbruster - Houston TX, US
Qian Fang - Houston TX, US
Zbigniew Wojcik - Houston TX, US

Assignee:

Ingrain, Inc. - Houston TX

International Classification:

G01V 1/40
G01V 3/18
G01V 5/04
G01V 9/00

US Classification:

702 6, 702 11

Abstract:

A method for determining in-situ relationships between physical properties of a porous medium from a sample thereof includes acquiring a three-dimensional image of the sample and segmenting the image into pixels representing pore space and pixels representing rock grain. A plurality of sub-volumes are selected from the segmented image, and a porosity is calculated for each of the sub-volumes. A digital simulation is conducted on each of the sub-volumes to obtain a selected physical property for the sub-volume. A relationship is determined between porosity and the selected physical property using relationship data comprising the calculated porosity and the simulated physical property for each of the sub-volumes. The method includes at least one of storing and displaying the relationship.

US Patent:

6374186, Apr 16, 2002

Filed:

Mar 24, 2000

Appl. No.:

09/534949

Inventors:

Jack Dvorkin - Emerald Hills CA
Gary Mavko - Stanford CA
Amos Nur - Stanford CA

Assignee:

Petrophysical Consulting, Inc. - Emerald Hills CA

International Classification:

G01V 128

US Classification:

702 18, 367 75

Abstract:

The present invention includes a method for overpressure detection and pore pressure change monitoring in subsurface gas, liquid hydrocarbon, or water reservoirs from compressional- and shear-wave measurement data. As part of this method, one or more Poissons ratios are determined from field-based measurement data and are then compared against known Poissons ratio values representative of the particular subsurface formation type. By applying a Poissons ratioâpore pressure criterion that is appropriate for that type of formation, an overpressure in the formation is identified.