Trace elements in a North Sea drill core

Helmar Kunzendorf, R. Gwozdz, N. Svendsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Chalk samples, systematically taken along a drill core from one of the hydrocarbon producing fields of the North Sea (Tyra field), were analysed by a neutron activation technique involving measurement of radioisotopes with relatively short half-lives. Elements determined include Na, Al, Cl, Ca, Mn, V, Sr, Dy, Mg, Ti, Ba and Eu. The major elements Ca and Al could be related to petrophysical parameters, particularly Al which shows a correlation with the silicification/argillaceous content. Na (and Cl) has a low content in the hydrocarbon-bearing section of the drill core suggesting that the pore space is filled mainly by hydrocarbons. A significant decrease of Mn with depth probably suggests diagenesis of chalk prior to, or with, hydrocarbon emplacement. Investigations of drilling fluids and cuttings reveal a strong contamination of the latter, mainly by Ba. Chalk data from comparable onshore localities (Danish subbasin) show a different geochemistry with generally less variation of elements with depth.
    Original languageEnglish
    JournalApplied Geochemistry
    Volume1
    Issue number3
    Pages (from-to)383-394
    ISSN0883-2927
    Publication statusPublished - 1986

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