Print Email Facebook Twitter Tackling Different Velocity Borne Challenges of the Elastodynamic Marchenko Method Title Tackling Different Velocity Borne Challenges of the Elastodynamic Marchenko Method Author Reinicke Urruticoechea, C. (TU Delft Applied Geophysics and Petrophysics) Dukalski, M.S. (TU Delft QN/Theoretical Physics; Aramco Overseas BV) Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics; TU Delft ImPhys/Acoustical Wavefield Imaging) Date 2019 Abstract The elastodynamic Marchenko method removes overburden interactions obscuring the target information. This method either relies on separability of the so-called focusing and Green's functions or requires an accurate initial estimate of the focusing and Green's function overlap. Hitherto, F1- and G-+ have been assumed separable, whereas F1+ and (G-)* share an unavoidable overlap, which has been considered understood but hard to predict without knowing the model. However, velocity differences between P- and S-waves cause so far unexplored fundamental challenges for elastodynamic Marchenko autofocusing. These challenges are analysed for horizontally-layered media. First, the F1-/G-+ separability assumption can be violated depending on the medium, the redatuming depth and the angle of incidence. Second, the initial estimate of the said unavoidable overlap can be even more complicated than originally thought, including some of the internal multiples. We propose a strategy where we trade-off this sophisticated initial estimate with a trivial one at the cost of a more restrictive F1-/G-+ separability assumption, or at the cost of introducing an overlap between F1- and G-+ instead. The proposed method finds the desired solutions convolved by an unknown matrix which we can hope to remove by exploiting energy conservation and minimum-phase properties of the focusing functions. To reference this document use: http://resolver.tudelft.nl/uuid:196da9fb-e54b-48ce-9b66-117491ef4a03 DOI https://doi.org/10.3997/2214-4609.201901517 Publisher EAGE Embargo date 2019-12-03 ISBN 9789462822894 Source 81st EAGE Conference and Exhibition 2019 Event 81st EAGE Conference and Exhibition 2019, 2019-06-03 → 2019-06-06, ExCeL Centre, London, United Kingdom Bibliographical note Accepted author manuscript Part of collection Institutional Repository Document type conference paper Rights © 2019 C. Reinicke Urruticoechea, M.S. Dukalski, C.P.A. Wapenaar Files PDF eage_19c.pdf 1.06 MB Close viewer /islandora/object/uuid:196da9fb-e54b-48ce-9b66-117491ef4a03/datastream/OBJ/view