Marine seismic survey pre-plot design

Patent metadata

Field	Value
Publication number	US-9945973-B2
Application number	US-201615202079-A
Country	US
Kind code	B2
Filing date	Jul 5, 2016
Priority date	Jul 7, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

Method and system for generating a full acquisition path for a marine seismic acquisition system. The method includes receiving survey area information about a survey area to be seismically surveyed; selecting a radius (R) and a length (L) of a lace; selecting an overlap distance (OL) between first and second lanes; generating the full acquisition path by repeating the lace along a first lead line inside the first lane and along a second lead line inside the second lane and replicating the first and second lanes until the entire survey area is covered with laces; and sending the full acquisition path to a streamer vessel for performing the seismic survey.

First claim

What is claimed is:

1. A method for generating a full acquisition path for a marine seismic acquisition system, the method comprising:
receiving survey area information about a survey area to be seismically surveyed;
selecting a radius (R) and a length (L) of a lace;
selecting an overlap distance (OL) between first and second lanes;
generating the full acquisition path by repeating the lace along a first lead line inside the first lane and along a second lead line inside the second lane and replicating the first and second lanes until the entire survey area is covered with laces; and
sending the full acquisition path to a streamer vessel for performing the seismic survey.

2. The method of claim 1 , wherein the first lane is obtained by repeating the lace along the first lead line and then repeating the lace along the first lead line, in an opposite direction, with a given shift S.

3. The method of claim 1 , wherein the overlap distance (OL) is between three and four radiuses (R).

4. The method of claim 1 , wherein the survey area information includes a length and a width of the survey area.

5. The method of claim 1 , wherein the lace includes two straight line portions and two curved portions.

6. The method of claim 1 , wherein the lace includes a first straight line portion, which is connected to a first curved portion, which is connected to a second straight line portion, which is connected to a second curved portion.

7. The method of claim 6 , wherein the second curved portion is connected to a straight line portion of a next lace.

8. The method of claim 1 , wherein two adjacent laces are superposed inside a given lane.

9. The method of claim 1 , wherein two laces from different lanes are superimposed.

10. The method of claim 1 , wherein the full acquisition path is made of a set of straight lines and a set of coils.

11. The method of claim 10 , wherein the set of coils include coils that overlap in top of each other.

12. A marine acquisition system for collecting seismic data, the system comprising:
a first streamer vessel;
a source towed by the first streamer vessel and configured to generate seismic waves;
a streamer spread towed by the first streamer vessel and configured to collect the seismic data generated by the seismic waves; and
a navigation system located on the first streamer vessel and configured to control the first streamer vessel to follow a first full acquisition path over a survey area,
wherein the first full acquisition path includes plural laces connected to each other, each lace being defined by a radius (R) and a length (L).

13. The system of claim 12 , wherein the laces follow a first lead line, and the laces along the first lead line define a first lane.

14. The system of claim 13 , wherein further laces follow a second lead line and the further laces define a second lane.

15. The system of claim 14 , wherein the first lane overlaps over the second lane.

16. The system of claim 13 , wherein the first lead line is curved.

17. The system of claim 12 , further comprising:
a second streamer vessel that follows a second full acquisition path that mirrors the first full acquisition path,
wherein the second full acquisition path is offset relative to the first full acquisition path.

18. The system of claim 17 , wherein there is an inline offset between the first and second streamer vessels which is controlled for improving a source-receiver distribution and/or an azimuth distribution.

19. A method for generating a full acquisition path for a seismic survey, the method comprising:
receiving characteristics of a survey area to be surveyed; and
generating the full acquisition path by replicating a lace along overlapping lanes, where the overlapping lanes cover the entire survey area, each lace defined by a radius (R) and a length (L),
wherein the full acquisition path includes a set of straight lines and a set of coils.

20. The method of claim 19 , wherein the straight lines are substantially perpendicular to each other and the coils overlap with each other.

Assignees

• Cgg Services Sa
• Cgg Services Sas

Inventors

• Grenie Damien
• Siliqi Risto
• Svay Julie
• Wilhelm Keith

Classifications

• B63B2211/02

  Oceanography · CPC title

• G01V1/3808 Primary

  Seismic data acquisition, e.g. survey design · CPC title

• B63B21/56

  Towing or pushing equipment (tugs B63B35/66; towing arrangements for water sports use B63B34/60) · CPC title

• G05D1/0206

  specially adapted to water vehicles · CPC title