Wide source seismic towing configuration
Various implementations described herein are directed to a method of acquiring seismic data. The method may include towing an array of marine seismic streamers coupled to a vessel. The array comprises a plurality of lead-in cables and streamers, and the plurality of lead-in cables comprises an innermost lead-in cable and an outermost lead-in cable with respect to a center line of the vessel. The method may also include towing a plurality of source cables and one or more seismic sources such that the one or more seismic sources are positioned between the innermost lead-in cable and the outermost lead-in cable.
1. A method for acquiring seismic data, comprising:
towing an array of marine seismic streamers coupled to a vessel, wherein the array comprises a plurality of lead-in cables and streamers, and the plurality of lead-in cables comprises an innermost lead-in cable and an outermost lead-in cable with respect to a center line of the vessel, and wherein each of the plurality of lead-in cables is towed at an offset to the center line of the vessel; and
towing a plurality of source cables and one or more seismic sources such that the one or more seismic sources are positioned entirely between the innermost lead-in cable and the outermost lead-in cable, wherein the plurality of source cables are configured to cross over at least one of the plurality of lead-in cables, wherein the at least one of the plurality of the lead-in cables is disposed at a greater depth than the source cables or seismic sources and wherein the seismic sources are disposed between 50 and 500 meters apart from the center line of the vessel.
2. The method of claim 1 , wherein the innermost lead-in cable is disposed at a greater depth than the source cables or seismic sources.
3. The method of claim 1 , wherein the innermost lead-in cable has a greater density than the source cables.
4. The method of claim 1 , wherein at least one of the plurality of the lead-in cables has a greater density than the source cables.
5. The method of claim 1 , further comprising towing at least one of the source cables over at least one of the lead-in cables.
6. The method of claim 1 , wherein the innermost lead-in cable has a greater density than the outermost lead-in cable.
7. The method of claim 1 , wherein at least one of the plurality of the lead-in cables has a greater density than the outermost lead-in cable.
8. The method of claim 1 , further comprising pulling at least one of the seismic sources from the center line of the vessel using one or more ropes connecting at least one of the seismic sources or source cables to one of the lead-in cables or a deflector.
9. A method for acquiring seismic data, comprising:
towing a plurality of lead-in cables coupled to a vessel and streamers, wherein each of the plurality of lead-in cables is towed at an offset to the center line of the vessel; and
towing a plurality of source cables and seismic sources coupled to the same vessel such that the seismic sources are disposed outside an outermost lead-in cable in the plurality of lead-in cables, wherein the plurality of source cables are configured to cross over at least one of the plurality of lead-in cables, wherein the at least one of the plurality of the lead-in cables is disposed at a greater depth than the source cables or seismic sources and wherein the seismic sources are between 50 and 1000 meters apart from a center line of the vessel.
10. The method of claim 9 , wherein the source cables are coupled to a left or right side of the vessel.
11. The method of claim 9 , wherein the seismic sources are vibrating sources.
12. The method of claim 9 , wherein deflectors are attached to the source cables.
13. A seismic acquisition system, comprising:
a vessel;
a plurality of lead-in cables coupled to the vessel and streamers, wherein the plurality of lead-in cables comprises an innermost lead-in cable and an outermost lead-in cable with respect to a center line of the vessel, and wherein each of the plurality of lead-in cables is towed at an offset to the center line of the vessel;
a plurality of source cables coupled to the vessel and seismic sources; and
wherein the sources are positioned entirely between the innermost lead-in cable and the outermost lead-in cable, wherein the plurality of source cables are configured to cross over at least one of the plurality of lead-in cables, wherein the at least one of the plurality of the lead-in cables is disposed at a greater depth than the source cables or seismic sources and wherein the seismic sources are offset by a distance of between 50 and 200 meters from the center line of the vessel.
14. The seismic acquisition system of claim 13 , wherein the innermost lead-in cable is disposed at a greater depth than the source cables or seismic sources.
15. The seismic acquisition system of claim 13 , wherein at least one of the source cables crosses over at least one of the lead-in cables.
16. The seismic acquisition system of claim 13 , further comprising one or more ropes connecting at least one of the seismic sources or source cables to one of the lead-in cables or a deflector.
17. The seismic acquisition system of claim 13 , wherein the innermost lead-in cable has a greater density than the source cables.
18. The seismic acquisition system of claim 13 , wherein at least one of the plurality of the lead-in cables has a greater density than the source cables.
19. The seismic acquisition system of claim 13 , wherein the innermost lead-in cable has a greater density than the outermost lead-in cable.
20. The seismic acquisition system of claim 13 , wherein at least one of the plurality of lead-in cables has a greater density than the outermost lead-in cable.
21. The seismic acquisition system of claim 13 , wherein one or more floats are attached to one or more of the source cables or one or more weights are attached to one or more of the lead-in cables.