Print Email Facebook Twitter Obtaining local reflectivity at two-way travel time by filtering acoustic reflection data Title Obtaining local reflectivity at two-way travel time by filtering acoustic reflection data Author Slob, E.C. (TU Delft Applied Geophysics and Petrophysics) Zhang, L. (TU Delft Applied Geophysics and Petrophysics) Wapenaar, C.P.A. (TU Delft ImPhys/Acoustical Wavefield Imaging; TU Delft Applied Geophysics and Petrophysics) Contributor Mihai Popovici, A. (editor) Fomel, S. (editor) Date 2017 Abstract A modified implementation of Marchenko redatuming leads to a filter that removes internal multiples from reflection data. It produces local reflectivity at two-way travel time. The method creates new primary reflections resulting from emitted events that eliminate internal multiples. We call these non-physicalprimaries and their presence is a disadvantage. The advantage is that the filter is model free. We give the 3D filter and demonstrate with 1D arguments that starting the focusing wavefield with a unit impulse at zero time, while focusing below the bottom reflector, is the choice that leads to a model free implementation. The starting impulse generates the reflection data. Every later emitted pulse eliminates an internal multiple somewhere in the model and helps removing the transmissionamplitude effects in a physical primary. We show thatthe amplitude of the non-physical primaries are a product ofthree reflections, making them generally smaller than those ofthe physical primaries. A 2D modeled shotgather at differentstages of filtering the data shows that the filter works well. To reference this document use: http://resolver.tudelft.nl/uuid:65a6e1bc-fd87-4944-82d3-6551b2d973a2 DOI https://doi.org/10.1190/segeab.36 Publisher SEG Source Proceedings of the 87th SEG annual meeting, expanded abstracts Event 87th SEG annual meeting, 2017-09-24 → 2017-09-29, Houston, United States Series SEG Technical Program Expanded Abstracts 2017, 1949-4645 Part of collection Institutional Repository Document type conference paper Rights © 2017 E.C. Slob, L. Zhang, C.P.A. Wapenaar Files PDF Seg_17b.pdf 1.02 MB Close viewer /islandora/object/uuid:65a6e1bc-fd87-4944-82d3-6551b2d973a2/datastream/OBJ/view