Oil to Triassic Source Correlations – An Example from Southern Moesian Platform Edge (N. Bulgaria)

摘要

The investigation includes three oil accumulations (Dolni Dubnik, Gradina and Bohot), situated in different stratigraphic levels in southern Moesian platform edge, and two source samples from most promising Triassic source interval (Mitrovo Fm.). They are compared by biomarker correlations using GC, GC-MS techniques. Dolni Dubnik economic oil, Gradina oil and Bohot oil flow are physically and compositionally identical and demonstrate very similar biomarker features. Investigated fractions are from the same "oil family", sharing the common source from marine organic matter. Middle Triassic source rocks from Mitrovo Fm. Are with fair dominantly gas generative potential. But the biomarker correlations clearly show that they are not source for the three crude oils. The most realistic scenario, concluded recently (Georgiev and Dabovski, 1997; Georgiev, 2000), is for Lower-Middle Jurassic sourcing of Dolni Dubnic oil family.