Kästner, Felix, Kläschen, Dirk , Berndt, Christian and Pierdominici, S. (2021) Anisotropic velocity models for (3D) seismic imaging of the Lower Seve Nappe in Jämtland, Sweden. [Poster] In: 81. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG). , 01.03.-05.03.2021, Kiel (online) .

Abstract

Strong anisotropy of seismic velocity in the Earth crust poses serious challenges for seismic imaging. Where in situ seismic properties are not available the anisotropy can be determined from independent surface and borehole seismic profiles. This is well established for dense, long-offset reflection seismic data. However, it is unknown how applicable this approach is for sparse seismic reflection data with low fold and short offsets. Here, we show that anisotropy parameters can be determined from a sparse 3D data set at the COSC-1 borehole site in the Swedish Caledonides and that the results agree well with the seismic anisotropic parameters determined on core samples from laboratory measurements. Applying these anisotropy parameters during 3D seismic processing significantly improves the seismic imaging of the high amplitude reflections especially in the lower part of the borehole. Strong reflectors in the resulting seismic data align well with the borehole-derived lithology. Our results aid the interpretation and extrapolation of the seismic stratigraphy of the Lower Seve Nappe.

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