Velocity-independent Marchenko method in time- and depth-imaging domains

Yanadet Sripanich, Ivan Vasconcelos, Kees Wapenaar, Jeannot Trampert

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

The Marchenko method represents a constructive technique toobtain Green�s functions between the acquisition surface andany arbitrary point in the medium. The process generally involvessolving an inversion starting with a direct-wave Green's function from the desired subsurface position, which is typicallyobtained using an approximate velocity model. In thisstudy, we first propose to formulate the Marchenko method inthe time-imaging domain. We recognize that the traveltimeof the direct-wave Green�s function is related to the Cheop�straveltime pyramid commonly used in time-domain processingand can be readily obtained from the local slopes of thecommon-midpoint (CMP) gathers. This observation allowsus to substitute the need for a prior velocity model with thedata-driven slope estimation process. Moreover, we show thatworking in the time-imaging domain allows for the specificationof the desired subsurface position in terms of vertical time,which is connected to the Cartesian depth position via the timeto-depth conversion. Our results suggest that the prior velocitymodel is only required when specifying the position in depthbut this requirement can be circumvented by making use of thetime-imaging domain and its usual assumptions. Provided thatthose assumptions are satisfied, the estimated Green�s functionsfrom the proposed method have comparable quality tothose obtained with the knowledge of a prior velocity
Original languageEnglish
Title of host publicationSEG Technical Program Expanded Abstracts 2018
Subtitle of host publication14-19 October 2018, Anaheim, United States
Pages5012-5016
DOIs
Publication statusPublished - 2018
EventSEG Annual Meeting 2018 - Anaheim convention Center, Anaheim, United States
Duration: 14 Oct 201819 Oct 2018
Conference number: 88
https://seg.org/Annual-Meeting-2018

Publication series

NameSEG Technical Program Expanded Abstracts 2018
PublisherSEG
ISSN (Electronic)1949-4645

Other

OtherSEG Annual Meeting 2018
Abbreviated titleSEG 2018
CountryUnited States
CityAnaheim
Period14/10/1819/10/18
Internet address

Keywords

  • acoustic
  • 2D
  • time-domain

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