Method and system for separating seismic sources in marine simultaneous shooting acquisition
AssigneePGS Geophysical AS
InventorsRolf H. Baardman, Roald Gunnar van Borselen
Life of this patent
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Abstract
Seismic data are obtained by recording simultaneously in seismic streamer, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residuals utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.
Claims18
In a process for generating an image of geological structures of a subterranean formation using marine seismic techniques in which two or more sources are activated to generate acoustic energy that is reflected from the subterranean formation and is recorded by seismic sensors in a blended shot record, the improvement comprising:
- forming a blending matrix of blending matrix elements that represent time delays between activations of the two or more sources;
- for each of the one or more source activations,
- determining a residual between the blended shot record and a product of predicted deblended data and the blending matrix, and
- minimizing the residual to obtain a deblended shot record of acoustic energy reflected from the subterranean formation in response to activation of one of the two or more sources;
- and
- using the deblended shot records to generate an image of the subterranean formation, thereby the image excluding interfering energy created by the sources.
A non-transitory computer readable medium having machine-readable instructions encoded thereon for enabling one or more processors of a computer system to perform operations comprising:
- obtaining a blended shot record recorded in a marine survey performed with two or more sources activated in a body of water above a subterranean formation;
- forming a blending matrix of blending matrix elements that represent time delays between activations of the two or more sources;
- for each of the one or more source activations,
- determining a residual between the blended shot record and a product of predicted deblended data and the blending matrix, and
- minimizing the residual to obtain a deblended shot record of acoustic energy reflected from the subterranean formation in response to activation of one of the two or more sources;
- and
- using the deblended shot records to generate an image of the subterranean formation.
A computer system programmed to generate an image of geological structures of a subterranean formation, the system comprising:
- one or more processors;
- one or more computer readable media;
- and
- machine readable instructions stored in the one or more computer readable media that when executed by the one or more processors performs operations comprising:
- retrieving a blended shot record from the one or more computer readable media, the blended shot record recorded by seismic sensors that detect acoustic energy reflected from the subterranean formation in response to activation of the two or more sources;
- forming a blending matrix of blending matrix elements that represent time delays between activations of the two or more sources;
- for each of the one or more source activations,
- determining a residual between the blended shot record and a product of predicted deblended data and the blending matrix, and
- minimizing the residual to obtain a deblended shot record of acoustic energy reflected from the subterranean formation in response to activation of one of the two or more sources;
- and
- using the deblended shot records to generate an image of the subterranean formation.
Dependencies are inferred from the claim text.