Generation of accomodation space around the D-1 fault during the Oligocene, Danish North Sea

Abstract

Implications of a sequence stratigraphic study of the Oligocene sediments in the Norwegian-Danish Basin around the D-1 well are presented. The study is based on seismic mapping, log interpretations and detailed dating. This paper focuses on the evolution of the accommodation space along and across the D-1 fault since the fault generated deviations in the available accommodation space and has a significant influence on the depositional geometry of the sequences. The results show that displacement across the D-1 is fairly constant along strike during deposition of the older Oligocene sequences. This is in contrast to the youngest Oligocene sequence which has a higher displacement rate and thus significant variations along strike. This emphasises, that the understanding of the structural evolution of local faults in a basin dominated by elastic sediment infill as the Tertiary North Sea has to be as detailed as the sequence stratigraphy, because the fault may have had a significant influence on the depositional geometry, and hence the complete sequence stratigraphic interpretation.