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- Title
Biodegradation in numerical basin modelling: a case study from the Gifhorn Trough, N-Germany.
- Authors
Blumenstein, I.; Krooss, B.; Primio, R.; Rottke, W.; Müller, E.; Westerlage, C.; Littke, R.
- Abstract
A mass balance concept based on petroleum compositional description using 14 individual compound groups has been developed to reproduce the process of in-reservoir petroleum biodegradation. Individual compound groups have been attributed different “biodegradabilities” and biodegradation rates to account for observed differences in their susceptibility to biodegradation. Petroleum compositional information is derived from basin modelling, in addition to temperature histories, filling rates and volumetric information. This new method has been subsequently applied to model the biodegradation processes in a petroleum system in the North German Basin. The case study area is situated in the Gifhorn Trough, where Jurassic reservoirs contain oils of variable API gravity (24°–33°), although present depth and temperature are similar. Numerical modelling revealed, however, that the filling histories of the individual reservoir structures differ considerably. Taking into account filling and temperature history of the reservoir structures, the newly developed biodegradation algorithm Biodexx predicted compositional data and API gravities similar to those observed in the study area, whereas earlier biodegradation approaches such as the biodegradation index (BDI) by Yu et al. (2002) did not reproduce the different biodegradation levels in the two investigated fields.
- Publication
International Journal of Earth Sciences, 2008, Vol 97, Issue 5, p1115
- ISSN
1437-3254
- Publication type
Article
- DOI
10.1007/s00531-007-0272-1