System and method for discontinuous spectrum emission in seismic exploration

Patent metadata

Field	Value
Publication number	US-10048394-B2
Application number	US-201415026541-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Oct 1, 2013
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A system and method for discontinuous spectrum emission in seismic exploration is disclosed. The method may include determining a minimum frequency to be emitted by a seismic source in a frequency spectrum. The method may further include selecting a maximum frequency to be emitted by the seismic source in the frequency spectrum. The method may include identifying a portion of the spectrum between the minimum frequency and the maximum frequency where a reduced signal will be emitted by the seismic source. The method may finally include emitting, by the seismic source, a seismic signal according to the frequency spectrum and the identified portion of the frequency spectrum with the reduced signal.

First claim

What is claimed is:

1. A method of discontinuous spectrum emission in seismic exploration, comprising:
determining a minimum frequency to be emitted by a seismic source in a frequency spectrum;
selecting a maximum frequency to be emitted by the seismic source in the frequency spectrum;
identifying a noise-susceptible portion of the frequency spectrum between the minimum frequency and the maximum frequency; and
emitting, by the seismic source, a seismic signal within the frequency spectrum, wherein a reduced signal is emitted in the identified noise-susceptible portion of the frequency spectrum.

2. The method of claim 1 , wherein emitting the seismic signal includes emitting at least one of a discrete frequency or a frequency sub-band.

3. The method of claim 1 , wherein a portion of the seismic signal is emitted by a second seismic source.

4. The method of claim 1 , further comprising:
determining a set of frequency sub-bands within the minimum frequency and the maximum frequency, each frequency sub-band is a range of frequencies within the frequency spectrum; and
wherein emitting the seismic signal is further according to each range of frequencies in each frequency sub-band.

5. The method of claim 4 , further comprising:
identifying a frequency sub-band that includes the identified noise-susceptible portion of the frequency spectrum; and
wherein emitting the seismic signal includes omitting the frequency sub-band that includes the noise-susceptible portion.

6. The method of claim 1 , further comprising determining an energy level at which to emit a particular frequency within the frequency spectrum.

7. The method of claim 6 , wherein the energy level for the particular frequency is based on a received energy being higher than a noise energy.

8. The method of claim 1 , further comprising selecting the frequency spectrum to emit based on at least one of a rule, minimization of aliasing in an F-K domain, minimization of overlapping regions in the F-K domain, an inversion algorithm analysis requirement, or identification of a noise-susceptible frequency.

9. A seismic exploration system, comprising:
a seismic source configured to: emit a seismic signal into a subsurface geology, wherein the seismic signal is based on:
determining a minimum frequency to be emitted by the seismic source in a frequency spectrum;
selecting a maximum frequency to be emitted by the seismic source in the frequency spectrum;
identifying a noise-susceptible portion of the frequency spectrum between the minimum frequency and the maximum frequency, wherein a reduced signal is emitted by the seismic source in the identified noise-susceptible portion of the frequency spectrum; and

a receiver configured to receive energy from the seismic source reflected off of the subsurface geology.

10. The seismic exploration system of claim 9 , wherein the seismic signal is further based on determining at least one of a discrete frequency to emit or a frequency sub-band to emit.

11. The seismic exploration system of claim 9 , wherein a portion of the seismic signal is emitted by a second seismic source.

12. The seismic exploration system of claim 9 , wherein the seismic signal is further based on determining a set of frequency sub-bands within the related minimum frequency and the maximum frequency, each frequency sub-band is a range of frequencies within the frequency spectrum.

13. The seismic exploration system of claim 9 , wherein the seismic signal is further based on determining an energy level at which to emit a particular frequency in the frequency spectrum.

14. The seismic exploration system of claim 9 , wherein the seismic signal is further based on selecting the frequency spectrum to emit based on at least one of a rule, minimization of aliasing in an F-K domain, minimization of overlapping regions in the F-K domain, an inversion algorithm analysis requirement, or identification of a noise-susceptible frequency.

15. A non-transitory computer-readable medium, comprising:
computer-executable instructions carried on the computer-readable medium, the instructions, when executed, causing a processor to:
determine a minimum frequency to be emitted by a seismic source in a frequency spectrum;
select a maximum frequency to be emitted by the seismic source in the frequency spectrum;
identify a noise-susceptible portion of the frequency spectrum between the minimum frequency and the maximum frequency; and
control the source to emit a seismic signal according to the frequency spectrum, wherein a reduced signal is emitted in the identified noise-susceptible portion of the frequency spectrum.

16. The non-transitory computer-readable medium of claim 15 , wherein emitting the seismic signal includes emitting at least one of a discrete frequency or a frequency sub-band.

17. The non-transitory computer-readable medium of claim 15 , wherein a portion of the seismic signal is emitted by a second seismic source.

18. The non-transitory computer-readable medium of claim 15 , further comprising instructions, when executed, causing a processor to:
determine a set of frequency sub-bands between the minimum frequency and the maximum frequency, each frequency sub-band is a range of frequencies within the frequency spectrum; and
wherein emitting the seismic signal is further according to each range of frequencies in each frequency sub-band.

19. The non-transitory computer-readable medium of claim 15 , further comprising instructions, when executed, causing a processor to determine an energy level at which to emit a particular frequency in the frequency spectrum.

20. The non-transitory computer-readable medium of claim 15 , further comprising instructions, when executed, causing a processor to select the frequency spectrum to emit based on at least one of a rule, minimization of aliasing in an F-K domain, minimization of overlapping regions in the F-K domain, an inversion algorithm analysis requirement, or identification of a noise-susceptible frequency.

Assignees

• Cgg Services Sa
• Cgg Services Sas

Inventors

• De Cacqueray Benoit
• Berron Cecile

Classifications

• G01V1/005 Primary

  with exploration systems emitting special signals, e.g. frequency swept signals, pulse sequences or slip sweep arrangements · CPC title

• G01V1/3861

  control of source arrays, e.g. for far field control · CPC title