43 
C28-Bisnorhopane/Hopane 
Fig. 35: C28-bisnorhopane (in relation to hopane) in North Sea crudes. Crude oils roughly 
sorted from north to south (left to right). 
But, in addition, all North Sea crudes are generally characterized by parameters which are 
mainly connected with crude oil maturity. Figures 36 and 37 show that already nearly a full 
separation of all North Sea crude oils from all Middle East crude oils, for example, is 
achieved by each of the chosen parameters (Tm/Hopane and Norhopane/Hopane) separately.