Full Wave Inversion Using a Spectral-Element Discontinuous Galerkin Method
J.R. Krebs, S.S. Collis, N.J. Downey, C.C. Ober, J.R. Overfelt, T.M. Smith, B.G. van Bloemen-Waanders and J.G. Young
Event name: 76th EAGE Conference and Exhibition 2014
Session: FWI - Theoretical Developments I
Publication date: 16 June 2014
Info: Extended abstract, PDF ( 1.04Mb )
Price: € 20
We have developed a flexible Discontinuous Galerkin (DG) toolkit for full-wave inversion (FWI) that operates on unstructured non-affine meshes using a variety of element types (quadrilateral, triangular, hexahedral). The code handles spatially-variable polynomial-order across the mesh, and includes two approaches: modal DG with exact adjoints and gradients, and spectral DG which, though computationally faster, has approximate adjoints and gradients. In this paper, we show that high-quality full wave inversion results are obtained using both the modal DG and the approximate spectral DG approaches. A 3D inversion of field data using spectral-element DG will be presented in the talk.