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Efficient 2D Hybrid Inversion of Airborne Frequency Domain DataNormal access

Authors: E. Auken, T. Boesen, A.V.C. Christiansen, G.F. Fiandaca, A.A. Pfaffhuber and M.V. Vöge
Event name: Second European Airborne Electromagnetics Conference
Session: Forward Modelling and Inversion I
Publication date: 03 September 2017
DOI: 10.3997/2214-4609.201702148
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 852.24Kb )
Price: € 20

We present a 2D inversion code for frequency-domain HEM data designed for inverting field scale surveys on normal desktop computers. The fundamental algorithm is a 2.5D algorithm with field separation into primary and secondary fields. Due to limited memory, as well as performance concerns, sectioning is introduced for splitting large surveys into smaller sections. Sectioning is only done when calculating the 2D forward and derivatives, and it is done with a sufficient overlap, such that vital 2D information is preserved. The algorithm uses a hybrid scheme which i) starts with 1D forward and inverse calculations, ii) then switches to 2D forward calculations and 1D derivatives, and iii) finally ends with full 2D calculations. The result of this is a code which produces results like a 2D code, but with a substantially shorter computational time.

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