Elimination of multiples from acoustic reflection data

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Abstract

Elimination of multiples from acoustic reflection data is important to reduce the effect of their presence in velocity model building and subsequent imaging. Many processing schemes assume only primary reflection events are present in the data. Free-surface multiple elimination is an established technology, but internal multiple elimination is under development. We show that new data-driven processing methods have led to a robust multiple elimination scheme. This scheme removes free-surface and internal multiples contemporarily but can also eliminate internal multiples after free-surface multiples elimination. For each recording time instant, the method computes two filters using only the measured reflection response and an estimate of the source time signature. Once the filters are computed, they are used to filter the data up to that time instant. The result is that multiples related to reflectors with a two-way travel time less than the chosen time instant are removed from the data. This removes possible overlap with the primary reflection from the first deeper reflector. This event can be taken and stored in a new dataset. Repeating the procedure for all recording times produces the desired primaries only dataset. A numerical and a field data example show the effectiveness of the method.
Original languageEnglish
Title of host publicationExtended Abstracts - 16th SAGA Biennial Conference & Exhibition 2019
Number of pages5
Publication statusPublished - 2019
Event16th SAGA Biennial Conference & Exhibition 2019: Current informing the future - Elangeni & Maharani, Durban, South Africa
Duration: 6 Oct 20199 Oct 2019
http://sagaconference.co.za/

Conference

Conference16th SAGA Biennial Conference & Exhibition 2019
Abbreviated titleSAGA 2019
CountrySouth Africa
CityDurban
Period6/10/199/10/19
Internet address

Keywords

  • multiple elimination
  • processing
  • acoustic

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