Device and method for wave-field reconstruction

Patent metadata

Field	Value
Publication number	US-9535181-B2
Application number	US-201514678099-A
Country	US
Kind code	B2
Filing date	Apr 3, 2015
Priority date	Apr 29, 2013
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Computing device, computer instructions and method for processing input seismic data d. The method includes a step of receiving the input seismic data d recorded in a first domain by seismic receivers that travel in water, the input seismic data d including up-going and down-going wave-fields; a step of generating a model p in a second domain to describe the input seismic data d; and a step of processing with a processor the model p to obtain an output seismic dataset indicative of the down-going wave-field and substantially free of the up-going wave-field.

First claim

What is claimed is:

1. A method for processing input seismic data d associated with a surveyed subsurface, the method comprising:
receiving the input seismic data d recorded in a first domain by seismic receivers that travel in water, the input seismic data d including up-going and down-going wave-fields;
generating a model p in a second domain to describe the input seismic data d;
processing with a processor the model p and applying interpolation to obtain an output seismic dataset indicative of the down-going wave-field and excluding of the up-going wave-field; and
generating an image of the surveyed subsurface based on the output seismic dataset.

2. The method of claim 1 , wherein the input seismic data d includes only pressure measurements.

3. The method of claim 1 , wherein the input seismic data d includes only particle motion measurements.

4. The method of claim 1 , wherein the input seismic data d includes both pressure and particle motion measurements.

5. The method of claim 1 , wherein the output seismic dataset is indicative of pressure measurements and/or particle motion measurements.

6. The method of claim 1 , wherein the first domain is a time-space domain.

7. The method of claim 1 , wherein the second domain is one of a radon domain, frequency-wave number domain, tau-p domain, parabolic domain, shifted hyperbola domain, singular value decomposition, rank reduction and curvelet domain.

8. The method of claim 1 , wherein the step of processing the model p comprises:
applying an L′ transform to the model p to obtain the output seismic dataset.

9. The method of claim 1 , wherein the step of processing also includes removing random, coherent or impulsive noise.

10. The method of claim 1 , wherein the output seismic dataset indicative of the down-going wave-field is generated at input positions.

11. The method of claim 1 , wherein the output seismic dataset indicative of the down-going wave-field is generated at positions different from the input seismic data.

12. The method of claim 1 , wherein the seismic dataset indicative of the down-going wave-field is free of the up-going wave-field.

13. The method of claim 1 , wherein the step of processing the model p comprises:
generating a seismic dataset indicative of the up-going wave-field and subtracting the up-going data from the input data to generate an output dataset substantially free of up-going energy.

14. The method of claim 8 , wherein the L′ transform also includes a receiver rotation or obliquity correction.

15. The method of claim 9 , wherein the coherent noise is cross-talk noise, interference noise or multiple energy.

16. The method of claim 9 , wherein the impulsive noise is cross-talk noise or interference noise.

17. The method of claim 9 , wherein an amount of noise is reduced by scaling or filtering energy associated with the model p prior to or during the application of the L′ transform.

18. The method of claim 10 , wherein the output seismic dataset indicative of the down-going wave-field is subtracted from the input seismic data d to obtain data d′ to be used for generating the image of the surveyed subsurface.

19. The method of claim 11 , wherein the positions are in-between the receivers.

20. The method of claim 11 , wherein the positions are at different depths than the input seismic data.

21. The method of claim 11 , wherein the positions are selected to match positions of receivers from another seismic survey.

22. The method of claim 11 , wherein the positions are equidistant from streamers on which the receivers are distributed.

23. The method of claim 20 , wherein the different depths are at the sea surface.

24. A computing device for processing input seismic data d associated with a surveyed subsurface, the computing device comprising:
an interface for receiving the input seismic data d recorded in a first domain by seismic receivers that travel in water, the input seismic data d including up-going and down-going wave-fields; and
a processor connected to the interface, the processor being configured to,
generate a model p in a second domain to describe the input seismic data d;
process the model p and apply interpolation to obtain an output seismic dataset indicative of the down-going wave-field and excluding of the up-going wave-field; and
generate an image of the surveyed subsurface based on the output seismic dataset.

25. A non-transitory computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, implement instructions for processing input seismic data d, the instructions comprising:
receiving the input seismic data d recorded in a first domain by seismic receivers that travel in water, the input seismic data d including up-going and down-going wave-fields and being associated with a surveyed subsurface;
generating a model p in a second domain to describe the input seismic data d;
processing the model p and applying interpolation to obtain an output seismic dataset indicative of the down-going wave-field and excluding of the up-going wave-field; and
generating an image of the surveyed subsurface based on the output seismic dataset.

Assignees

• Cgg Services Sa

Inventors

• Poole Gordon

Classifications

• G01V2210/1293

  Sea · CPC title

• G01V1/30 Primary

  Analysis (G01V1/50 takes precedence) · CPC title

• G01V2210/47

  Slowness, e.g. tau-pi · CPC title

• G01V2210/56

  De-ghosting; Reverberation compensation · CPC title

• G01V1/38

  specially adapted for water-covered areas (G01V1/28 takes precedence) · CPC title