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2-D and 3-D Joint Inversion of Seismic, MT and Gravity Data from the Faroe-Shetland BasinNormal access

Authors: B. Heincke, M. Moorkamp, M. Jegen, R.W. Hobbs and C. Berndt
Event name: 76th EAGE Conference and Exhibition 2014
Session: Joint Inversion Velocity Model Building Methodology
Publication date: 16 June 2014
DOI: 10.3997/2214-4609.20141109
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.42Mb )
Price: € 20

We present both 2-D and 3-D joint inversions of seismic tomography, MT and gravity data from Faroe-Shetland Basin. The objective is to evaluate how far petrophysically-linked joint inversions can improve both the imaging and the interpretation of the basalt flows and the underlying structures. The investigation area is License006, where the presence of a borehole (BRUGDAN) and a 3-D reflection seismic survey allow a direct comparison and, hence, an evaluation of the quality of the joint inversion models. For the 2-D and 3-D investigations we use different joint-inversion codes that have other strengths and weaknesses. We observe that results from both 2-D and 3-D joint inversions are more consistent than the ones from the corresponding individual inversions and the shape of the basaltic sequence and structures underneath are better resolved. The 2-D joint inversion in particular gives precise basalt thicknesses, whereas the 3-D joint inversion determines a two-dimensional high-resistivity anomaly that is oriented in the same direction as general regional trends of basement.

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