Compiling a national resistivity atlas of Denmark based on airborne and ground-based transient electromagnetic data

Adrian A.S. Barfod, Ingelise Møller, Anders V. Christiansen

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

25 Citationer (Scopus)

Abstrakt

We present a large-scale study of the petrophysical relationship of resistivities obtained from densely sampled ground-based and airborne transient electromagnetic surveys and lithological information from boreholes. The overriding aim of this study is to develop a framework for examining the resistivity-lithology relationship in a statistical manner and apply this framework to gain a better description of the large-scale resistivity structures of the subsurface. In Denmark very large and extensive datasets are available through the national geophysical and borehole databases, GERDA and JUPITER respectively. In a 10 by 10 km grid, these data are compiled into histograms of resistivity versus lithology. To do this, the geophysical data are interpolated to the position of the boreholes, which allows for a lithological categorization of the interpolated resistivity values, yielding different histograms for a set of desired lithological categories. By applying the proposed algorithm to all available boreholes and airborne and ground-based transient electromagnetic data we build nation-wide maps of the resistivity-lithology relationships in Denmark. The presented Resistivity Atlas reveals varying patterns in the large-scale resistivity-lithology relations, reflecting geological details such as available source material for tills. The resistivity maps also reveal a clear ambiguity in the resistivity values for different lithologies. The Resistivity Atlas is highly useful when geophysical data are to be used for geological or hydrological modeling.

OriginalsprogEngelsk
Sider (fra-til)199-209
Antal sider11
TidsskriftJournal of Applied Geophysics
Vol/bind134
DOI
StatusUdgivet - 1 nov. 2016

Programområde

  • Programområde 2: Vandressourcer

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