Modeling of the erosion phases during the Mesozoic in The Broad Fourteens, offshore the Netherlands

Abstract

In this report estimates of erosion in the Broad Fourteens during the Mesozoic are presented. This is done by using, among others, a new 3D seismic model of this area provide by the National Geological Survey, TNO. Results show that most erosion occurred in the southeastern part of the Broad Fourteens Basin. The maximum erosion of 3100 meter is calculated for well P06-02. This is also the area where the most sediment is deposited during the Mesozoic. Erosion values are presented as erosion maps running from the Triassic till the Cretaceous. The erosion maps show that mainly the Triassic sediments are removed from the platforms and highs, while the Jurassic and essentially the Cretaceous are removed in the basin. The erosion maps of the Lower and Upper Cretaceous show a decreasing distribution of the amount of erosion from the southeastern part of the basin towards the northwestern part. By looking at the fault systems, cross sections and the amount of erosion, of this period, it is therefore stated that the erosion started first in the southern part of the basin (Late Turonian) and then moved up northwards (Late Coniacian- Early Santonian). The most sediment was removed in the Broad Fourteens Basin during the Sub Hercynian tectonic event and had therefore the most influence on the general structure of the basin.