Method and system for seismic data acquisition with top and front sources
AssigneeSercel
InventorsVetle Vinje, Anne Camerer, Iain Burnie
Life of this patent
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Abstract
A marine seismic data acquisition system includes a streamer spread including plural streamers; a first set of front sources configured to generate seismic waves; a streamer vessel towing the streamer spread and the first set of the front sources, in front of the streamer spread along an inline direction X; a second set of top sources configured to generate additional seismic waves; and first and second source vessels towing the second set of top sources directly above or below the streamer spread. A number NT of the top sources is larger than a number NF of the front sources.
Claims19
A marine seismic data acquisition system comprising:
- a streamer spread including plural streamers;
- a first set of front sources configured to generate seismic waves;
- a streamer vessel towing the streamer spread and the first set of the front sources, in front of the streamer spread along an inline direction X;
- a second set of top sources configured to generate additional seismic waves;
- and
- a first source vessel and a second source vessel towing a first subset of the second set of top sources and a second subset of the second set of top sources, respectively, directly above or below the streamer spread, the first subset being offset cross-line relative to the second subset.
A marine seismic data acquisition system comprising:
- a streamer spread including plural streamers;
- a set of front sources configured to generate seismic waves, wherein the set of the front sources is towed in front of the streamer spread, along an inline direction X;
- and
- a first set of top sources towed parallel with an inline offset relative to a second set of top sources, the top sources belonging to the first and second set being towed directly above or below the streamer spread,
- wherein a cross-line distance DSTy between adjacent top sources along a cross-line direction Y, which is perpendicular to the inline direction X, is larger than a cross-line distance DSFy between adjacent front sources.
A method for configuring a marine seismic acquisition data system, the method comprising:
- selecting a number NF of front sources, wherein the front sources are towed in front of a streamer spread, along an inline direction X;
- selecting a frequency range FF for the front sources;
- selecting a number NT of top sources towed vertically directly above or below the streamer spread by at least two vessels, the top sources being split into at least two subsets of plural source elements, which are offset crossline relative to one another;
- and
- selecting a cross-line separation DSTy between adjacent top sources of the top sources that is larger than a cross-line separation DSFy between adjacent front sources of the front sources, wherein a cross-line direction is perpendicular to an inline direction.
Dependencies are inferred from the claim text.