Numerical simulation of thermal convection in compacting sedimentary basins
TLDR
In this paper, a numerical model of combined fluid flow and heat flow is used to study convection in sedimentary basins during compaction, and the main issue of the paper is the interaction of non-Rayleigh convection flow with compaction flow and/or meteoric flow.Abstract:
SUMMARY
A numerical model of combined fluid flow and heat flow is used to study convection in sedimentary basins during compaction. the main issue of the paper is the interaction of non-Rayleigh convection flow with compaction flow and/or meteoric flow. It is shown that under reasonable assumptions, the flow inside a permeable layer is the superposition of the compaction flow through the layer and the thermal convection flow in the layer. These assumptions are expressed in terms of the time constants involved. Non-Rayleigh convection roll(s) will therefore appear if the compaction flow (or the meteoric flow) is less than the thermally induced flow. This condition can be stated by a simple expression involving the Rayleigh number for the layer and the absolute value of the flow velocity through the layer. Two case studies are presented, which show non-Rayleigh convection in compacting basins. A numerical example of Rayleigh convection is also presented, which demonstrates that Rayleigh convection, under realistic conditions such as compressible rock and non-perfect thermal conducting top and bottom boundaries, is a complex process. This case study shows that even a ‘small’ amount of vertical excess pressure gradient is enough to stabilize the fluid inside a layer.
sedimentary basins
thermal convectionread more
Citations
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References
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Density, Porosity, and Compaction of Sedimentary Rocks
TL;DR: In this article, the relation between depth of burial and the density, porosity, and compaction of different types of sediment is discussed and data are presented, which can be expressed by exponential equations.
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TL;DR: In this article, it was shown that under certain conditions convective flow may occur in fluid which permeates a porous stratum and is subject to a vertical temperature gradient, on the assumption that the flow obeys Darcy's law.
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The progress of consolidation in a clay layer increasing in thickness with time
TL;DR: In this paper, it is shown that in general the problem can be reduced to a linear integral equation, a solution of which is obtained for the case of deposition at a constant rate, and an example is given of a numerical procedure for estimating the progress of consolidation in a rolled fill dam during construction.
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On the Maintenance of Anomalous Fluid Pressures: I. Thick Sedimentary Sequences
TL;DR: In this paper, the authors present a series of general solutions to hydrodynamic models which are germane to the problem of creating and maintaining excessfluid pressures in a thick sedimentary sequence.