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Application of 2D Acoustic Full Waveform Inversion to OBC-data in Shallow WaterNormal access

Authors: M. Kunert, A. Kurzmann and T. Bohlen
Event name: 78th EAGE Conference and Exhibition 2016
Session: Full Waveform Inversion IV
Publication date: 31 May 2016
DOI: 10.3997/2214-4609.201601549
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.39Mb )
Price: € 20

Summary:
In this work we present the application of 2D acoustic full waveform inversion (FWI) in the time domain to a marine seismic data set acquired in a river delta area. Due to particular circumstances, such as the occurrence of guided waves in shallow water and a simple starting model for the P-wave velocity, we developed an inversion strategy involving data windowing (with focus on refracted waves), data filtering, consideration of attenuation in modelling and an alternating inversion for model parameter and source signature. This complex FWI workflow has been successfully applied to the field data set, resulting in the reconstruction of a velocity model showing small-scale structures. In particular, we identified low-velocity areas as potential fault zones or gas ``pockets''. The comparison of the FWI model with the result of a standard reflection seismic imaging method shows a high similarity. On the one hand, this can be considered as a validation of the FWI strategy. On the other hand, the availability of structural information and physical parameters improves petrophysical characterisation of the subsurface.


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