Abstract
A series of 64 coal and clastic rock samples of Westphalian age was taken from five narrow (<3 m) depth intervals between 1200 and 1530 m depth and studied by geochemical and petrological methods. Maturity increases regularly with increasing depth as indicated by several maturity parameters. The influence of organic facies is evident in the uppermost coal seam (0.70% R r), where a hand-picked vitrinite contains less total extract and less saturated long-chain hydrocarbons than a directly adjacent sporinite-rich coal. Extracts from deeper and more mature coals are less affected by facies changes, probably due to enhanced petroleum redistribution in the seams. Total yield and gross composition of extracts in the deepest seam (0.92% R r) which is directly overlain by sandstone, seem to be influenced by the preferential expulsion of saturated hydrocarbons.
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