What is it about?
The utilization of multiples in imaging and characterization is an emerging methodology. Multiples are waves that are reflected or scattered more than once at the subsurface interfaces and eventually recorded at the seismic detectors. Very often, multiples can reach into the earth to illuminate the shadow zones which primaries cannot reach. This paper is about designing and analyzing 3D seismic acquisition geometries in particular for the case that multiple reflections are considered as signal rather than noise.
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Why is it important?
Our analysis shows that multiples are not noise; instead they should be considered as important signals when designing and analyzing an acquisition geometry. Symmetric sampling in seismic acquisition design is based on the analysis of primary reflections only. Asymmetric sampling is the future of acquisition geometry if multiple reflections are used rather than removed.
Perspectives
We presented an integrated approach of seismic acquisition geometry analysis that can incorporate illumination by primaries as well as multiples. We consider this is an era of using multiples as a signal in the seismic imaging. Therefore, it is important to find what it means to the seismic data acquisition. One straightforward thinking may arise that the sparse sampling issues in the data acquisition would be compensated by utilizing surface and internal multiples as secondary sources. Therefore, an expensive data acquisition design with the 'symmetric sampling' concept can be replaced by the concept of 'asymmetric sampling'.
Mr Amarjeet Kumar
Technische Universiteit Delft
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This page is a summary of: Extending illumination using all multiples: application to 3D acquisition geometry analysis, Geophysical Prospecting, October 2015, Wiley,
DOI: 10.1111/1365-2478.12326.
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