Abstract
The clay mineral assemblages of the Rhaetic -Jurassic - Lower Cretaceous sequences from the Borglum 1 and U glev 1 wells have been investigated to evaluate the diagenesis of the sediments. Besides grain size analyses, the methods include X-ray diffraction analyses and scanning electron microscopy in combination with energy dispersive analyses. The distribution of clay minerals essentially shows a rapid change from smectite to kaolinite dominance with increasing depth. Kaolinite dominates the older sediments below the lower part of the Haldager Formation, including the Fjerritslev and Gassum Formations, while smectite dominates the younger sediments above the upper part of the Haldager Formation, which includes Bream and Vedsted Formations. This change is primarily attributed to differences in the composition of the mineralogy and geochemical environment rather than to burial diagenesis. While some early diagenesis has taken place to form authigenic kaolinite, thorough depth-dependent diagenesis can hardly be detected.
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