Zur Geochemie niedrigmolekularer Kohlenwasserstoffe im Posidonienschiefer der Hilsmulde. Kohlenwasserstoffbildung und Reifeaspekte

Compositional changes in the light hydrocarbon fraction of sedimentary rocks and petroleum are known to reflect their maturation history. The present contribution comprises the analysis of low-molecular-weight hydrocarbons in core samples of Lower Toarcian age ( Posidonia Shale , Lias e). The sample series, obtaines by shallow-borehole drilling in the Hils syncline area, Lower Saxony Basin, northern Germany, represents an exceptionally organic matter rich petroleum source rock (type-II kerogen) of a wide maturity range (mean vitrinite reflectance, R r between 0.5 and 1.5%). About 30 compounds in the C 2 -C 7 molecular range, including benzene and toluene, were determined by means of a combined thermovapourization/capillary GC method