Seismic data recording and processing with different uncontaminated recording time lengths
AssigneeCgg Services SAS
InventorGordon Poole
Life of this patent
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Abstract
A method for generating an image of a subsurface based on blended seismic data includes receiving the blended seismic data, which is recorded so that plural traces have uncontaminated parts with different uncontaminated recording time lengths, selecting plural subgroups (SG1, SG2) of traces so that each subgroup (SG1) includes only uncontaminated parts that have a same uncontaminated recording time length, processing the traces from each subgroup to generate processed traces, mapping the processed traces to a same sampling, combining the processed traces from the plural subgroups (SG1, SG2) to generate combined processed traces, and generating an image of a structure of the subsurface based on the combined processed traces.
Claims18
A method for generating an image of a subsurface based on blended seismic data, the method comprising:
- receiving the blended seismic data, which includes first traces have a first cross-talk free portion of a first uncontaminated recording time length and second traces having a second cross-talk free portion of a second uncontaminated recording length different from the first uncontaminated recording time length and corresponding to a larger exploration depth than the first uncontaminated recording time length;
- processing the first traces and the second traces to generate first processed traces and second processed traces, respectively;
- mapping the first processed traces and the second processed traces to a same sampling;
- combining the first processed traces and the second processed traces as mapped to generate combined processed traces;
- and
- generating an image of a structure of the subsurface based on the combined processed traces to locate a desired resource,
- wherein the step of receiving comprises:
- acquiring the blended seismic data so that the first traces are recorded following firing one source at a first subset of shotpoints with a first time lag, and the second traces are recorded following another source at a second subset of the shotpoints with a second time lag, the second time lag being different from the first time lag.
A method for acquiring blended seismic data of a subsurface, the method comprising:
- towing first and second seismic sources S1, S2 above the subsurface;
- firing the first and second seismic sources S1, S2 with corresponding first and second lags, L1 and L2, respectively, relative to pre-determined shotpoints, wherein the first lag L1 is different from the second lag L2;
- and
- recording blended seismic data after firing the first and second seismic sources S1, S2, the blended seismic data including first traces having a first cross-talk free part with a first uncontaminated recording time length due to the first lag and second traces having a second cross-talk free portion of a second uncontaminated recording length due to the second lag, the second uncontaminated recording length corresponding to a larger exploration depth than the first uncontaminated recording time length.
A method for generating an image of a subsurface based on blended seismic data, the method comprising:
- receiving the blended seismic data, which includes first traces have a first cross-talk free portion of a first uncontaminated recording time length and second traces having a second cross-talk free portion of a second uncontaminated recording length different from the first uncontaminated recording time length and corresponding to a larger exploration depth than the first uncontaminated recording time length;
- processing the first traces and the second traces to generate first processed traces and second processed traces, respectively;
- mapping the first processed traces and the second processed traces to a same sampling;
- combining the first processed traces and the second processed traces as mapped to generate combined processed traces;
- and
- generating an image of a structure of the subsurface based on the combined processed traces to locate a desired resource,
- wherein the blended seismic data is acquired with a seismic survey having a first source towed further away along an inline direction, than a second source, to achieve the first uncontaminated recording time length different from the second uncontaminated recording time length.
Dependencies are inferred from the claim text.