Upper Carboniferous (Westphalian C D) fluvial sandstones and Zechstein Ca2 (Stassfurt second
cycle) carbonates represent two important hydrocarbon reservoir units in NW Europe. A better
understanding of reservoir quality variations and their spatial variability is crucial to
develop successful exploration strategies. In fluvial Westphalian C D sandstones and Ca2
carbonate reservoirs the reservoir properties are controlled by diagenetic alterations and
intense fracturing.
