Abstract
Vitrinite reflectance data (% R m) are presented for coals from two wells in The Netherlands. These data are grouped according the allied sedimentary sequences. Three groups of sedimentary sequences are distinguished. Thin coal-seams covered by sands show suppressed % R m values. Relatively high values are found in thick coal-seams covered by shales. Coal seams with irregular sequences do not show abberant values. It is suggested that the low reflectance values are caused by relatively more intense biodegradation during the early diagenesis, due to continuous refreshment of te ambient watermass. In sediments covered by a stagnant watermass biodegradation has not progressed as far, leaving vitrinite precursors relatively rich in oxygen. Vitrinites produced in these environments have a high % R m value. The redoxpotential is a predominant factor governing the diagenetic processes.
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