Block Joint Inversion (BJI) of MRS and DC Resistivity Soundings for Aquifer Imaging at the North Sea Island Borkum
T. Gunther, J. Liebau, I. Akca and M. Müller-Petke
Event name: Near Surface 2011 - 17th EAGE European Meeting of Environmental and Engineering Geophysics
Session: Modelling, Inversion and Processing II
Publication date: 12 September 2011
Info: Extended abstract, PDF ( 1.58Mb )
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We present a joint block inversion of DC resistivity and spectral inversion of magnetic resonance sounding (MRS) data. Coupling is achieved by using identical layer thicknesses. We apply the method to data from the north sea island Borkum and demonstrate that the joint inversion is superior to single inversions. Spectral inversion is necessary and finally allows for distinguishing lithology and salinity. Both deterministic, Gauss-Newton (GN), and stochastic, Genetic Algorithm (GA), approaches yield identical results within the resolution limits.