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US 11,029,432 B2Granted
De-aliased source separation method
AssigneeSEISMIC APPARITION GmbH
InventorsDirk-Jan Van Manen, Fredrik Andersson, Johan Robertsson, Kurt Eggenberger
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Abstract
Methods are described for separating the unknown contributions of two or more sources from a commonly acquired aliased wave field signals including the determination of models with reduced support in the frequency-wavenumber domain which reconstruct the wave fields of independently-activated sources after a coordinate-transform of the acquired wave field data and/or in a coordinate-transformed domain.
Claims21
A method, comprising:
- obtaining wave field recordings based on activation of at least two sources along one or more activation lines, including varying at least one parameter between the sources from one activation to another, the at least one parameter being one or more of a source signal amplitude, a source signal spectrum, a source activation time, a source location at activation time, and a source depth, such that the varying causes one or more scaled replications of a wave field with limited, cone-shaped support in the frequency-wavenumber domain of at least one of the at least two sources along a wavenumber axis or axes with the one or more scaled replications partially overlapping a wave field with limited, cone-shaped support of one or more of the other of the at least two sources, with the wave field with limited cone-shaped support of the one or more of the other of the at least two sources being either not affected or replicated and scaled by the varying;
- separating, by processing circuitry, a contribution of at least one of the at least two sources to the obtained wave field recordings as generated by the at least two sources individually, in the absence of the other of the at least two sources;
- reducing, by the processing circuitry, an aliasing ambiguity in a result of the separating step, which is caused by the one or more replications partially overlapping, by applying at least one coordinate transformation to the obtained wave field recordings;
- generating, by the processing circuitry, a sub-surface representation of structures or Earth media properties from the contribution of at least one of the at least two sources;
- and
- outputting the generated sub-surface representation.
3 more elements
An apparatus, comprising:
- processing circuitry configured to
- obtain wave field recordings based on activation of at least two sources along one or more activation lines, including varying at least one parameter between the sources from one activation to another, the at least one parameter being one or more of a source signal amplitude, a source signal spectrum, a source activation time, a source location at activation time, and a source depth, such that the varying causes one or more scaled replications of a wave field with limited, cone-shaped support in the frequency-wavenumber domain of at least one of the at least two sources along a wavenumber axis or axes with the one or more scaled replications partially overlapping a wave field with limited, cone-shaped support of one or more of the other of the at least two sources, with the wave field with limited cone-shaped support of the one or more of the other of the at least two sources being either not affected or replicated and scaled by the varying;
- separate a contribution of at least one of the at least two sources to the obtained wave field recordings as generated by the at least two sources individually, in the absence of the other of the at least two sources;
- reduce an aliasing ambiguity in a result of the separating step, which is caused by the one or more replications partially overlapping, by applying at least one coordinate transformation to the obtained wave field recordings;
- generate a sub-surface representation of structures or Earth media properties from the contribution of at least one of the at least two sources;
- and
- output the generated sub-surface representation.
4 more elements
Dependencies are inferred from the claim text.