Three-dimensional rock properties using cross well seismic

Patent metadata

Field	Value
Publication number	US-9581710-B2
Application number	US-201414522895-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Oct 24, 2014
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

Various implementations directed to determining three-dimensional (3D) rock properties using cross well seismic are provided. In one implementation, a method may include receiving 3D seismic data acquired in a seismic survey of a region of interest. The method may also include receiving cross well seismic data acquired in a cross well seismic survey of the region of interest. The method may further include determining a first set of rock properties of the region of interest based on the cross well seismic data. The method may additionally include determining one or more variograms based on the first set of rock properties. The method may also include determining one or more 3D rock properties of the region of interest based on the one or more variograms and the 3D seismic data.

First claim

What is claimed is:

1. A method, comprising:
receiving three-dimensional (3D) seismic data acquired in a seismic survey of a region of interest;
receiving cross well seismic data acquired in a cross well seismic survey of the region of interest;
determining a first set of rock properties of the region of interest based on the cross well seismic data;
determining one or more variograms based on the first set of rock properties; and
determining one or more 3D rock properties of the region of interest based on the one or more variograms and the 3D seismic data.

2. The method of claim 1 , further comprising:
performing one or more seismic processing techniques on the received 3D seismic data; and
performing the one or more seismic processing techniques on the received cross well seismic data.

3. The method of claim 2 , wherein the one or more seismic processing techniques comprises prestack data processing.

4. The method of claim 2 , wherein determining the first set of rock properties comprises:
performing a first seismic inversion on the processed cross well seismic data to determine the first set of rock properties.

5. The method of claim 4 , wherein the first seismic inversion comprises deterministic inversions, stochastic inversions, or discrete spike inversions.

6. The method of claim 4 , wherein determining the one or more variograms comprises:
deriving one or more pseudo wells based on the inverted cross well seismic data; and
deriving the one or more variograms based on the one or more pseudo wells.

7. The method of claim 2 , further comprising:
performing a second seismic inversion on the processed 3D surface seismic data to determine a second set of rock properties.

8. The method of claim 7 , wherein the second seismic inversion comprises deterministic inversions, stochastic inversions, or discrete spike inversions.

9. The method of claim 7 , wherein determining the one or more 3D rock properties comprises:
performing a stochastic inversion on the second set of rock properties using the one or more variograms.

10. The method of claim 7 , wherein the resolution of the 3D rock properties is greater than the resolution of the second set of rock properties.

11. The method of claim 2 , wherein determining the one or more 3D rock properties comprises:
performing a stochastic inversion on the processed 3D seismic data using the one or more variograms.

12. A non-transitory computer-readable medium having stored thereon a plurality of computer-executable instructions which, when executed by a computer, cause the computer to:
receive three-dimensional (3D) seismic data acquired in a seismic survey of a region of interest;
receive cross well seismic data acquired in a cross well seismic survey of the region of interest;
determine a first set of rock properties of the region of interest based on the cross well seismic data;
determine one or more variograms based on the first set of rock properties; and
determine one or more 3D rock properties of the region of interest based on the one or more variograms and the 3D seismic data.

13. The non-transitory computer-readable medium of claim 12 , wherein the computer-executable instructions which, when executed by a computer, further cause the computer to:
perform one or more seismic processing techniques on the received 3D seismic data; and
perform the one or more seismic processing techniques on the received cross well seismic data.

14. The non-transitory computer-readable medium of claim 13 , wherein the computer-executable instructions which, when executed by a computer, cause the computer to determine the first set of rock properties, further comprise computer-executable instructions which, when executed by a computer, cause the computer to:
perform a first seismic inversion on the processed cross well seismic data to determine the first set of rock properties.

15. The non-transitory computer-readable medium of claim 14 , wherein determining the one or more variograms comprises:
derive one or more pseudo wells based on the inverted cross well seismic data; and
derive the one or more variograms based on the one or more pseudo wells.

16. The non-transitory computer-readable medium of claim 12 , wherein the computer-executable instructions which, when executed by a computer, cause the computer to determine the one or more 3D rock properties, further comprise computer-executable instructions which, when executed by a computer, cause the computer to:
perform a stochastic inversion on the processed 3D seismic data using the one or more variograms.

17. A computer system, comprising:
a processor; and
a memory comprising a plurality of program instructions which, when executed by the processor, cause the processor to:
receive three-dimensional (3D) seismic data acquired in a seismic survey of a region of interest;
receive cross well seismic data acquired in a cross well seismic survey of the region of interest;
determine a first set of rock properties of the region of interest based on the cross well seismic data;
determine one or more variograms based on the first set of rock properties; and
determine one or more 3D rock properties of the region of interest based on the one or more variograms and the 3D seismic data.

18. The computer system of claim 17 , further comprising program instructions which, when executed by the processor, cause the processor to:
perform one or more seismic processing techniques on the received 3D seismic data; and
perform the one or more seismic processing techniques on the received cross well seismic data.

19. The computer system of claim 18 , further comprising program instructions which, when executed by the processor, cause the processor to:
perform a seismic inversion on the processed cross well seismic data to determine a second set of rock properties.

20. The computer system of claim 19 , wherein determining the one or more high resolution 3D rock properties comprises:
perform a stochastic inversion based on the second set of rock properties using the one or more variograms.

Assignees

• Westerngeco Llc

Inventors

• Leiceaga Gorka Garcia

Classifications

• G01V1/003 Primary

  Seismic data acquisition in general, e.g. survey design (G01V1/3808, G01V1/42 take precedence) · CPC title

• G01V1/306 Primary

  for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles · CPC title

• G01V2210/6161

  Seismic or acoustic, e.g. land or sea measurements · CPC title

• G01V1/345 Primary

  Visualisation of seismic data or attributes, e.g. in 3D cubes · CPC title

• G01V2210/163

  Cross-well · CPC title