Abstract
A detailed log-stratigraphic study was conducted on the Lower Cretaceous Cromer Knoll Group in the Sten-1, I-1, Nora-1, Elin-1, Bo-1 and Adda-1 wells in the Danish Central Trough. Six major, 24 intermediate and a number of minor log-units were identified and correlated between the wells. The log-units are defined by consistent log trends and are separated by distinct shifts in log readings. The log-units are isochronous within the resolution of the biostratigraphy and are calibrated to the standard chronostratigraphic scale. A good correlation between the log-units and published seismic stratigraphy was established. In the homogeneous Lower Cretaceous clay, marl and chalk deposits the log-stratigraphic method used is seen to be an important correlation tool, supplementing the biostratigraphy and seismic stratigraphy. A detailed log-stratigraphic subdivision of the Lower Cretaceous has been established. Depositional hiatuses were found and subsidence and uplift patterns of different subbasins are described. The overall successive changes in the lithological character of the major log-units coincide with the long-term fluctuations of the Haq et al. eustatic sea-level curve.
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