Anvendelse af gamma-logs ved korrelation af marine skifre i vandforsyningsboringer pa Bornholm

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10 Citationer (Scopus)

Abstrakt

Gamma-logs have been run in five water supply wells and in two exploration boreholes which penetrate the Lower Palaeozoic marine shales on Bornholm. A very good correlation between sedimentary facies, TOC analyses and gamma-logs is demonstrated in the two exploration boreholes Skelbro 1 and Billegrav 1 which were cored continuously. Each of the major lithostratigraphic units within the Middle Cambrian, Ordovician and Lower Silurian shales is characterized by an easily recognizable gamma-log pattern which furthermore can be divided into several subunits reflecting a frequent change in grain-size, in TOC or in calcite cementation. Lateral correlation to gamma-logs in the four of the five water supply wells demonstrate the lateral continuity in the sedimentary facies of the Middle Cambrian to Lower Silurian shales. The gamma-log in the fifth water supply well shows a much more monotonous log-pattern, indicating small variations in the facies. This log was run in the Cyrtograptus shale and cannot be correlated to the other wells because it does not reach the Ordovocian Rastrites shale. -English summary

Bidragets oversatte titelThe use of gamma-rays in the correlation of marine shales in water supply wells in Bornholm
OriginalsprogDansk
Sider (fra-til)21-35
Antal sider15
TidsskriftÅrsskrift for Dansk geologisk Forening
Vol/bind1987-89
StatusUdgivet - 15 sep. 1989
Udgivet eksterntJa

Emneord

  • Gamma ray
  • shale
  • Bornholm
  • Lower Palaeozoic

Programområde

  • Programområde 3: Energiressourcer

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