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US 7,742,876 B2Granted
Wavefield decomposition for cross-line survey
AssigneeWesternGeco L.L.C.
InventorJohan Olof Anders Robertsson
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Abstract
It is described a method for spatially filtering 3D seabed seismic data acquired in a cross-line geometry including methods of how to decompose the data using a filter with two spatial components.
Claims11
A method for marine seismic data acquisition, comprising:
- obtaining a 3D wavefield by cross-line acquisition using one or more marine seismic sources and a plurality of marine seismic receivers arranged into one or more lines, wherein:
- the one or more marine seismic sources are towed behind a seismic vessel in an essentially orthogonal direction relative to the one or more lines of the marine seismic receivers;
- the one or more marine seismic source are fired at intervals as the one or more mariner seismic sources are towed orthogonally with respect to the one or more lines of the marine seismic receivers;
- and
- an offset between shooting locations of the one or more seismic sources is regarded as an equal shift of the line of seismic receivers;
- and
- decomposing the obtained seismic wavefield by applying a decomposition filter having two spatial directions to obtain a decomposed wavefield, wherein the decomposition filter is applied as a cascaded filter.
4 more elements
Dependencies are inferred from the claim text.