Abstract
A Middle Miocene oil source rock has been identified by geochemical logging of exploration wells in the Eastern Drava depression (EDD) and in the Slavonija-Srijem depression (SSD) at the south-east margin of the Pannonian Basin, Croatia. The source rock contains Type II to II/III kerogen and reaches early maturity stage at depths of about 2400 m. The Mesozoic sequences were found either to be absent or to be poor in organic matter within the analysed wells. According to C27-C28-C29 sterane and C27-C28-C29 monoaromatic steroid distributions, gamacerane indices, C35 homohopane indices and presence of C30 steranrs, the EDD and SSD oils wrre generated from the same marine source rock. The distribution of homohopanes and high Ni/(Ni + V) porphyrin ratios indicates that the related source rock was deposited under suboxic conditions. The oils appear to have been generated from the source rock during the early to middle stages of maturity. The oils are waxy, with pour points up to 30°C and sulphur contents not exceeding 0.7%.
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