"The mismatched wavelet problem can be partially solved in the adaptive subtraction part of the process, through wavelet adjustment in the common channel domain, but the effectiveness of this approach does not meet the quality of a similar analysis with constant depth streamer data. Further, this attempt leaves many high-frequencies residual multiples and the low-frequencies multiples cannot be properly addressed.
"Accordingly, it would be desirable to provide systems and methods that avoid the afore-described problems and drawbacks, and improve the multiples model prediction for variable-depth streamer data and the accuracy of the final image."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "According to an exemplary embodiment, a method, stored in a memory and executing on a processor, for correcting wavelet variations associated with a variable depth streamer configuration for seismic data collection, the method comprises processing a recorded variable-depth datum pre-stack dataset, in a shot gather domain, by deghosting the pre-stack dataset wherein all multiples orders are processed; and outputting a deghosted pre-stack dataset wherein the deghosted pre-stack dataset is normalized to a sea-surface datum and provided to a multiples elimination technique.
"According to another exemplary embodiment, a system for correcting wavelet variations associated with a variable-depth streamer configuration, the system comprises a dataset containing a plurality of streamer variable-depth input trace data; one or more processors configured to execute computer instructions and a memory configured to store said computer instructions wherein said computer instructions further comprises a deghosting component for processing a recorded variable-depth datum pre-stack dataset, in a shot gather domain, wherein all multiples orders are processed; and an output component for outputting a deghosted pre-stack dataset wherein said deghosted pre-stack dataset is normalized to a sea-surface datum and provided to a multiples elimination technique.
BRIEF DESCRIPTION OF THE DRAWINGS
"The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate one or more embodiments and, together with the description, explain these embodiments. In the drawings:
"FIG. 1 is a schematic diagram illustrating a marine-based seismic data acquisition system with a variable depth streamer and up-going rays;
"FIG. 2 is a schematic diagram illustrating a marine-based seismic data acquisition system with a variable depth streamer and down-going rays;
"FIG. 3 is a flowchart illustrating a method for variable wavelet correction;
"FIG. 4 is a schematic diagram illustrating a system for variable wavelet correction comprising a deghosting component and an output component;
"FIG. 5 is a schematic diagram illustrating a system for variable wavelet correction comprising a deghosting component, an output component and a reghosting component;
"FIG. 6 is a schematic diagram of a computerized system that implements various methods according to an exemplary embodiment;
"FIG. 7 is a composite schematic diagram of an input wavelet based on a variable depth streamer in 7a, a standard SRME wavelet prediction in 7b and an exemplary embodiment with a variable wavelet correction applied to the input data as part of a standard SRME wavelet prediction in 7c; and
"FIG. 8 is a composite schematic diagram with 8a depicting an input spectrum from a variable depth streamer versus a spectrum predicted by a standard SRME technique based on variable depth streamer data and 8b depicting an input spectrum from a variable depth streamer versus a spectrum predicted by an exemplary embodiment variable wavelet correction applied to the variable depth streamer data before a standard SRME technique prediction."
For more information, see this patent application: SABLON, Ronan. Variable Depth Streamer Srme. U.S. Patent Application Serial Number 600270, filed
Keywords for this news article include: Cggveritas Services Sa, Information Technology, Information and Data Processing.
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