Embla field producing oil from Permian and Devonian reservoirs:
Reservoir sand with GC trace of produced oil:
Core plugs of Embla rhyolites with GC of biodegraded oil, and re-generated waxy oil from the biodegraded oil. The latter was trapped in fluid inclusions roughly 200Ma ago, ie. Pre-Jurassic:
Typical Kimmeridge oil with low wax, concave n-alkane profile, absence of gammacerane whereas Paleozoic sourced oils are different:
Pre-Jurassic oil from the North Sea characterized by even/odd predominance and high ETR:
Light oil fraction of some North Sea oils. Some show a pattern suggesting that they originate from a carbonate source:
Isotopically very light Paleozoic derived oils are clearly differentiated from isotopically heavier U. Jurassic derived oil and from the isotopically heaviest coal derived oils:
