Inverting for lithology using resistivity models and boreholes

A.V. Christiansen, N. Foged, E. Auken

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedingspeer review

2 Citationer (Scopus)

Abstrakt

We present an automatic method for parameterization of a 3D model of the subsurface, integrating lithological information from boreholes with resistivity models through an inverse optimization, with the objective of further detailing for geological models or as direct input to groundwater models. The parameter of interest is the clay fraction, expressed as the relative length of clay-units in a depth interval. The clay fraction is obtained from lithological logs and the clay fraction from the resistivity is obtained by establishing a simple petrophysical relationship, a translator function, between resistivity and the clay fraction. Through inversion we use the lithological data and the resistivity data to determine the optimum spatially distributed translator function. Applying the translator function we get a 3D clay fraction model, which holds information from the resistivity dataset and the borehole dataset in one variable. We apply the concept to the Norsminde survey in Denmark integrating approximately 700 boreholes and more than 100,000 resistivity models from an airborne survey in the parameterization of the 3D model covering 156 km2. The final 3D model differentiates between clay materials and different high resistive materials from information held in resistivity model and borehole observations respectively.

OriginalsprogEngelsk
TitelNear Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics
ForlagEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Elektronisk)9789462820272
DOI
StatusUdgivet - 2014
Udgivet eksterntJa
Begivenhed20th European Meeting of Environmental and Engineering Geophysics of EAGE's Near Surface Geoscience Division - Athens, Grækenland
Varighed: 14 sep. 201418 sep. 2014

Publikationsserier

NavnNear Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics

Konference

Konference20th European Meeting of Environmental and Engineering Geophysics of EAGE's Near Surface Geoscience Division
Land/OmrådeGrækenland
ByAthens
Periode14/09/1418/09/14

Programområde

  • Programområde 2: Vandressourcer

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