Abstract
The processes of secondary petroleum migration and reservoir filling remain among the least understood steps with respect to the characterisation and economic assessment of a petroleum system. Spatial heterogeneities of compositions of unaltered petroleum within individual fields have repeatedly been recognised and interpreted to result from compositional changes of multiple petroleum charges during the accumulation history in combination with limited degree of in-reservoir mixing of petroleum fluids (England, W. A., Mackenzie, A. S., Mann, D. U., & Quigley T. M. (1987). The movement and entrapment of petroleum fluids in the subsurface. J. Geol. Soc. London 144, 327–347; Leythaeuser, D., & Rückheim, J. (1989). Heterogeneity of oil composition within a reservoir as a reflection 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 effects of the flow of petroleum fluids by studying case histories on regional or field scales. In the study reported here we have, in addition, attempted to reconstruct the mode of filling of sandstone reservoir rocks on pore scales.
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