Abstract
The reliable mathematical modelling of secondary petroleum migration that incorporates structural geology and mature source rocks in the basin model, allows for prediction of the reservoir location, yielding the significant enhancement of the probability of exploration success. We investigate secondary petroleum migration with a significant composition difference between the source and oil pools. In our case study, the secondary migration period is significantly shorter than the time of the hydrocarbon pulse generation. Therefore, neither adsorption nor dispersion of components can explain the concentration difference between the source rock and the reservoir. For the first time, the present paper proposes deep bed filtration of hydrocarbons with component kinetics retention by the rock as a physics mechanism explaining compositional grading. Introduction of the component capture rate into mass balance transport equation facilitates matching the concentration difference for heavy hydrocarbons, and the tuned filtration coefficients vary in their common range. The obtained values of filtration coefficients monotonically increase with molecular weight and consequently affects the size of the oleic component, as predicted by the analytical model of deep bed filtration. The modelling shows a negligible effect of component dispersion on the compositional grading.
Highlights
Secondary migration of hydrocarbons is a buoyant flow from the source rock upward along the carrier bed, resulting in the formation of petroleum accumulation (Figure 1)
The aim of this study is to provide an explanation of the observed compositional gradients of petroleum fluidsthe due to losing components by adsorption usingcompositional mathematicalgradients modelling and matching field data. their
For the first time we propose deep bed filtration of hydrocarbons in carrier beds to explain the difference between oil compositions in source rock and the reservoir by retention of hydrocarbon molecules in carrier bed
Summary
Secondary migration of hydrocarbons is a buoyant flow from the source rock upward along the carrier bed, resulting in the formation of petroleum accumulation (Figure 1). Mathematical models for secondary migration of single-phase multicomponent oil-gas fluids reflect numerous processes of mass transfer between the rock and fluid occurring during secondary migration of hydrocarbons [2,3,4,5,6,7,8,9]. Under steady state of a single-phase multicomponent column and assuming constant temperature, the thermodynamic equilibrium corresponds to a constant total of chemical and gravity potentials [19,20]. This provides the Geosciences 2019, 9, 78; doi:10.3390/geosciences9020078 www.mdpi.com/journal/geosciences
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