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Broadband Full Waveform Inversion by Shot/Receiver Re-focusing
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition incorporating EUROPEC 2012, Jun 2012, cp-293-00792
- ISBN: 978-90-73834-27-9
Abstract
The resolution of FWI schemes is largely limited by the huge computational resources which are involved in the process and current implementations use only low frequencies to obtain a background velocity model for migration. In this paper we present an innovative scheme to split up the large scale inversion problem into many small scale local inversions. The method is based on back-propagation of seismic sources and receivers into the subsurface which allows us to use the full seismic bandwidth to obtain inversion results with a resolution far beyond current practice. By combining the local results and performing a global wave field update nonlinear effects, e.g. internal multiple scattering, can be estimated and a high resolution nonlinear inversion result is obtained. We successfully demonstrate our scheme on an acoustic 2-D synthetic dataset while inverting for acoustic velocity only and assuming density to be known. Extension to a multi parameter inversion will be the subject of future research.