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Numerical simulation of thermal convection in compacting sedimentary basins

机译：压实沉积盆地热对流数值模拟

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A numerical model of combined fluid flow and heat flow is used to study convection in sedimentary basins during compaction. In case of non-Rayleigh convection it is shown under reasonable assumptions that the flow inside a permeable layer is the superposition of the compaction flow in the layer and the thermal convection flow. Non-Rayleigh convection roll(s) will therefore appear if the compaction flow (or the metoric flow) is less than the thermally induced flow. Rayleigh convection is also studied, and numerical experiments indicate that even a small amount of vertical compaction flow will stabilize the fluid in a layer, and thereby inhibit or retard the onset of Rayleigh convection. The isoterms are affected by Rayleigh convection outside the layer where the convection cells appear. Cases studies are presented, which illustrate the appearance of Rayleigh and non-Rayleigh convection during sediment compaction. 15 refs., 12 figs., 4 tabs.

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