Large-scale 3-D modeling by integration of resistivity models and borehole data through inversion

N. Foged, Pernille Aabye Marker, A. V. Christiansen, Peter Bauer-Gottwein, F. Jørgensen, A. S. Høyer, E. Auken

    Research output: Contribution to journalJournal articleResearchpeer-review

    466 Downloads (Pure)

    Abstract

    We present an automatic method for parameterization of a 3-D model of the subsurface, integrating lithological information from boreholes with resistivity models through an inverse optimization, with the objective of further detailing of geological models, or as direct input into 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 3-D clay fraction model, which holds information from the resistivity data set and the borehole data set in one variable. Finally, we use k-means clustering to generate a 3-D model of the subsurface structures. We apply the procedure 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 3-D model covering 156 km2. The final five-cluster 3-D model differentiates between clay materials and different high-resistivity materials from information held in the resistivity model and borehole observations, respectively.
    Original languageEnglish
    JournalHydrology and Earth System Sciences
    Volume18
    Issue number11
    Pages (from-to)4349-4362
    Number of pages14
    ISSN1027-5606
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    Dive into the research topics of 'Large-scale 3-D modeling by integration of resistivity models and borehole data through inversion'. Together they form a unique fingerprint.

    Cite this