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US 8,588,025 B2Granted
Method and apparatus for acquiring wide-azimuth marine data using simultaneous shooting
AssigneeWesternGeco L.L.C.
InventorsNicolae Moldoveanu, Craig J. Beasley
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Abstract
A technique for acquiring wide azimuth seismic data using simultaneous shooting is presented in which a plurality of seismic sources are positioned to achieve a desired crossline sampling as a function of the number of passes. This is accomplished by “interleaving” sources as deployed in the spread, as positioned in multiple passes, or some combination of these things, to achieve an effective shotline interval during acquisition or an effective crossline sampling less than their crossline source separation.
Claims18
A method, comprising:
- deploying a towed array, marine seismic spread, the spread including:
- a plurality of streamer arrays;
- a plurality of streamer vessels, each streamer vessel towing a respective one of the streamer arrays;
- and
- a plurality of source vessels, each source vessel towing one or more seismic sources from a plurality of seismic sources;
- traversing the deployed spread across a survey area such that the sail lines of vessels on the leading edge of the deployed spread are interleaved with the sail lines of vessels on the trailing edge of the deployed spread;
- shooting one or more combinations of seismic sources from the plurality of seismic sources according to a source crossline separation interval, wherein the seismic sources in at least one of the combinations are separated by the crossline separation interval and wherein the crossline separation interval is used to separate data attributable to the seismic sources in the at least one of the combinations;
- and
- acquiring wide azimuth survey data during the traversal.
6 more elements
A method, comprising:
- deploying a towed array, marine seismic spread having a plurality of streamer arrays and a plurality of seismic sources;
- traversing the deployed spread across a survey area;
- and
- acquiring wide azimuth survey data during the traversal, comprising:
- shooting one or more combinations of seismic sources from the plurality of seismic sources in an interleaved manner such that at least one of the combinations comprises at least two seismic sources that are shot substantially simultaneously and have source lines separated in the crossline direction;
- and
- receiving a seismic wavefield generated by shooting the seismic sources.
4 more elements
Dependencies are inferred from the claim text.