Pressure Solution in Sedimentary Basins: Effect of Temperature Gradient - Physics > GeophysicsReport as inadecuate




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Abstract: Pressure solution is an important process in sedimentary basins, and itsbehaviour depends mainly on the sediment rheology and temperature distribution.The compaction relation of pressure solution is typically assumed to be aviscous one and is often written as a relationship between effective stress andstrain rate. A new derivation of viscous compaction relation is formulatedbased on more realistic boundary conditions at grain contacts. A nonlineardiffusion problem with a moving boundary is solved numerically and a simpleasymptotic solution is given to compare with numerical simulations. Pressuresolution is significantly influenced by the temperature gradient. Porosityreduction due to pressure solution is enhanced in an environment with a higherthermal gradient, while porosity decreases much slowly in the region where thethermal gradient is small. Pressure solution tends to complete more quickly atshallower depths and earlier time in higher temperature environment than thatin a low one. These features of pressure solution in porous sediments areanalysed using a perturbation method to get a solution for the steady state.Comparison with real data shows a reasonably very good agreement.



Author: Xin-She Yang

Source: https://arxiv.org/







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