Method for seismic data acquisition and processing
AssigneeSEISMIC APPARITION GmbH
InventorsJohan ROBERTSSON, Robin Walker, Fredrik Andersson, Dirk-Jan Van Manen, Kurt Eggenberger
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Abstract
Methods are described for separating the unknown contributions of two or more sources from a commonly acquired set of wavefield signals representing a wavefield where the sources are laterally located relatively close to each other and fire relatively close in time, and where the contributions from different sources are separated using different source encoding techniques in different parts of a frequency band of interest.
Claims20
A wavefield acquisition and/or processing method to separate sources above a certain frequency, below which the data acquisition and/or processing is performed without separating of the sources, the method comprising:
- encoding at least two different sources relative to each other;
- obtaining wavefield recordings for the encoded at least two sources;
- partitioning the obtained wavefield recordings into a first dataset containing frequencies below the certain frequency, and a second dataset containing frequencies above the certain frequency;
- for the first dataset containing frequencies below the certain frequency, identifying a first contribution of the least two sources to the obtained wavefield recordings as generated by the at least two sources jointly;
- for the second data set containing frequencies above the certain frequency, separating a second contribution of at least one of the at least two sources to the obtained wavefield recordings as generated by the at least two sources individually in an absence of the other sources;
- generating subsurface representations of structures or Earth media properties using the separated second contribution of at least one of the at least two sources above the certain frequency and the identified first contribution generated by the at least two sources jointly below the certain frequency;
- and
- outputting the generated subsurface representations.
An apparatus to separate sources above a certain frequency, below which the sources are not separated, the apparatus comprising:
- processing circuitry configured to
- encode at least two different sources relative to each other;
- obtain wavefield recordings for the encoded at least two sources;
- partition the obtained wavefield recordings into a first dataset containing frequencies below the certain frequency, and a second dataset containing frequencies above the certain frequency;
- for the first dataset containing frequencies below the certain frequency, identify a first contribution of the least two sources to the obtained wavefield recordings as generated by the at least two sources jointly;
- for the second data set containing frequencies above the certain frequency, separate a second contribution of at least one of the at least two sources to the obtained wavefield recordings as generated by the at least two sources individually in an absence of the other sources;
- generate subsurface representations of structures or Earth media properties using the separated second contribution of at least one of the at least two sources above the certain frequency and the identified first contribution generated by the at least two sources jointly below the certain frequency;
- and
- output the generated subsurface representations.
Dependencies are inferred from the claim text.