Device and method for constrained wave-field separation

Patent metadata

Field	Value
Publication number	US-10436922-B2
Application number	US-201615276961-A
Country	US
Kind code	B2
Filing date	Sep 27, 2016
Priority date	Oct 5, 2015
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

Computing device, computer instructions and method for up-down separation of seismic data. The method includes receiving the seismic data, which includes hydrophone data and particle motion data; performing a first up-down separation, which is independent of a ghost model, using as input the hydrophone data and the particle motion data, to obtain first up-down separated data; performing a second up-down separation by using as input a combination of (i) the hydrophone data and/or the particle motion data and (ii) the first up-down separated data, wherein an output of the second up-down separation is second up-down separated data; and generating an image of the subsurface based on the second up-down separated data.

First claim

What is claimed is:

1. A method performing up-down separations of seismic data, the method comprising:
receiving the seismic data, which includes hydrophone data and particle motion data;
performing a first up-down separation, which is independent of a ghost model, using as input the hydrophone data and the particle motion data, to obtain first up-down separated data;
performing a second up-down separation by using as input a combination of (i) the hydrophone data and/or the particle motion data and (ii) the first up-down separated data, the second up-down separation outputting second up-down separated data; and
generating an image of the subsurface based on the second up-down separated data.

2. The method of claim 1 , wherein the input for the second up-down separation includes (1) only the hydrophone data and (2) the first up-down separated data.

3. The method of claim 1 , wherein the input for the second up-down separation includes (1) only the particle motion data and (2) the first up-down separated data.

4. The method of claim 1 , wherein the input for the second up-down separation includes (1) the hydrophone data, (2) the particle motion data and (3) the first up-down separated data.

5. The method of claim 1 , wherein the second up-down separation is a ghost model-dependent process.

6. The method of claim 1 , wherein the first up-down separated data is a summation of the hydrophone data and the particle motion data.

7. The method of claim 6 , wherein the particle motion data is corrected for obliquity prior to the first up-down separation.

8. The method of claim 1 , wherein the particle motion data is processed to reduce a noise content prior to the first up-down separation.

9. The method of claim 1 , wherein the first up-down separated data is a difference between the hydrophone data and the particle motion data.

10. The method of claim 1 , wherein the second up-down separation is an inversion process that calculates a wave-field separated model p based on the seismic data and a matrix L, which depends on time delays associated with up-going wave-fields and down-going wave-fields.

11. A computing device performing up-down separations of seismic data, the computing device comprising:
an interface configured to receive the seismic data, which includes hydrophone data and particle motion data; and
a processor connected to the interface, the processor configured to,
perform a first up-down separation, which is independent of a ghost model, using as input the hydrophone data and the particle motion data, to obtain first up-down separated data,
perform a second up-down separation by using as input a combination of (i) the hydrophone data and/or the particle motion data and (ii) the first up-down separated data, the second up-down separation yielding second up-down separated data, and
generate an image of the subsurface based on the second up-down separated data.

12. The computing device of claim 11 , wherein the input for the second up-down separation includes (1) only the hydrophone data and (2) the first up-down separated data.

13. The computing device of claim 11 , wherein the input for the second up-down separation includes (1) only the particle motion data and (2) the first up-down separated data.

14. The computing device of claim 11 , wherein the input for the second up-down separation includes (1) the hydrophone data, (2) the particle motion data and (3) the first up-down separated data.

15. The computing device of claim 11 , wherein the second up-down separation is a ghost model-dependent process.

16. The computing device of claim 11 , wherein the first up-down separated data is a summation of the hydrophone data and the particle motion data.

17. The computing device of claim 11 , wherein the particle motion data is processed to reduce a noise content prior to the first up-down separation.

18. The computing device of claim 11 , wherein the first up-down separated data is a difference between the hydrophone data and the particle motion data.

19. The computing device of claim 11 , wherein the second up-down separation is an inversion process that calculates a wave-field separated model p based on the seismic data and a matrix L, which depends on time delays associated with up-going wave-fields and down-going wave-fields.

20. A non-transitory computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, implement instructions for performing up-down separations of seismic data, the instructions executing a method comprising:
receiving the seismic data, which includes hydrophone data and particle motion data;
performing a first up-down separation, which is independent of a ghost model, using as input the hydrophone data and the particle motion data, to obtain first up-down separated data;
performing a second up-down separation by using as input a combination of (i) the hydrophone data and/or the particle motion data and (ii) the first up-down separated data, the second up-down separation outputting second up-down separated data; and
generating an image of the subsurface based on the second up-down separated data.

Assignees

• Cgg Services Sa
• Cgg Services Sas

Inventors

• Poole Gordon

Classifications

• G01V1/368

  Inverse filtering · CPC title

• G01V2210/244

  Radon transform · CPC title

• G01V2210/74

  Visualisation of seismic data · CPC title

• G01V2210/47

  Slowness, e.g. tau-pi · CPC title

• G01V2210/677

  Spectral; Pseudo-spectral · CPC title