Constructing only the primary reflections in seismic data - Without multiple removal

G. A. Meles*, K. Wapenaar, A. Curtis, C. Da Costa Filho

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

State of the art methods to image the Earth's subsurface using active-source seismic reflection data involve reverse-time migration (RTM). This, and other standard seismic processing methods such as velocity analysis, provide best results only when all waves in the data set are primaries (waves reflected only once). A variety of methods are therefore deployed as pre-processing to predict multiples (waves reflected several times); however, accurate removal of those predicted multiples from recorded data using adaptive subtraction techniques proves challenging, even in cases where they can be predicted with reasonable accuracy. We describe a new, alternative strategy: we construct a parallel data set consisting of only primaries, which is calculated directly from recorded data. This obviates the need for both multiple prediction and removal methods. Primaries are constructed using convolutional interferometry to combine first arriving events of up-going and direct-wave down-going Green's functions to virtual receivers in the subsurface. The required up-going wavefields to virtual receivers are constructed by Marchenko redatuming. Crucially, this is possible without detailed models of the Earth's subsurface velocity structure. The method is shown both to be particularly robust against errors in the reference velocity model used, and to improve migrated images substantially.

Original languageEnglish
Title of host publication78th EAGE Conference and Exhibition 2016
Subtitle of host publicationEfficient Use of Technology - Unlocking Potential
PublisherEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Electronic)9789462821859
Publication statusPublished - 1 Jan 2016
Event78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential - Vienna, Austria
Duration: 30 May 20162 Jun 2016

Conference

Conference78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
Country/TerritoryAustria
CityVienna
Period30/05/162/06/16

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