Geological-conditions-and-geochemical-effects-of-secondary-petroleum-migration-and-accumulation.pdf

Marine and Petroleum Geology 17 (2000) 857±859
ate/marpetgeo
Geological conditions and geochemical e€ects of secondary
petroleum migration and accumulation
D. Leythaeuser*, L. Schwark, Ch. Keuser
Geologisches Institut der UniversitaÈtzuKoÈln, ZuÈlpicher Street 49a, D-50667 Koln, Germany
Received 22 May 1999; accepted 30 December 1999
Abstract
The processes of secondary petroleum migration and reservoir ®lling remain among the least understood steps with respect to
the characterisation and economic assessment of a petroleum system. Spatial heterogeneities positions of unaltered
petroleum within individual ®elds have repeatedly been recognised and interpreted to result positional changes of
multiple petroleum charges during the accumulation history bination with limited degree of in-reservoir mixing of
petroleum ¯uids (England, W. A., Mackenzie, A. S., Mann, D. U., & Quigley T. M. (1987). The movement and entrapment of
petroleum ¯uids in the subsurface. J. Geol. Soc. London 144, 327±347; Leythaeuser, D., & RuÈ ckheim, J. (1989). Heterogeneity of
position within a reservoir as a re¯ection of accumulation history. Geochim. Cosmochim. Acta, 53(8), 2119±2123). Most
previous attempts, to improve this situation, have aimed at an understanding of the conditions and e€ects of the ¯ow of
petroleum ¯uids by studying case histories on regional or ®eld scales. In the s