Computational simulation of seepage instability problems in fluid-saturated porous rocks: Potential dynamic mechanisms for controlling mineralisation patterns
Computational simulation of seepage instability problems in fluid-saturated porous rocks: Potential dynamic mechanisms for controlling mineralisation patterns
复制标题
流体饱和多孔岩石渗流不稳定问题的计算模拟：控制矿化模式的潜在动力学机制
DOI：
10.1016/j.oregeorev.2016.05.002
复制
发表时间：
2016-12
影响因子：
3.3
通讯作者：
B.E. Hobbs
中科院分区：
文献类型：
--
作者：
Zhao, Chongbin;P. Schaubs;B.E. Hobbs
与渗流不稳定性相关的孔隙流体流动在控制地球上地壳内的大型矿化模式方面可以发挥重要作用。为了证明这一过程，本文考虑了流体饱和多孔岩石中的两种渗流不稳定问题。第一种渗流不稳定问题是由温度引起的孔隙流体浮力引起的，因此可以称为浮力驱动的渗流不稳定问题；而第二种渗流不稳定问题是由地球上地壳中常见的化学溶解反应引起的，因此可以称为化学溶解驱动的渗流不稳定问题。在介绍了这两类渗流不稳定问题的数学控制方程和计算方法之后，通过两个数值例子来阐明这两类渗流不稳定问题如何以及为何为地球上地壳内大型矿化格局的形成提供了有利场所。相关计算模拟结果表明：（1）浮力驱动的渗流失稳引起的对流孔隙流体流动不仅可以溶解上地壳下部的矿物，而且可以将溶解的矿物从上地壳下部输送到上部，从而在地球上地壳表面附近形成大的矿化格局。 (2) 流体饱和多孔岩石中化学溶解驱动的渗流不稳定性可以为地球上地壳内大型矿化模式的形成提供一些有利的场所，例如多孔岩石中孔隙度增加所形成的指状通道。
Pore-fluid flow associated with seepage instabilities can play an important role in controlling large mineralisation patterns within the upper crust of the Earth. To demonstrate this process, two kinds of seepage instability problems in fluid-saturated porous rocks are considered in this paper. The first kind of seepage instability problem is caused by the temperature-induced buoyancy of pore fluid, so that it can be called the buoyancy-driven seepage instability problem, while the second kind of seepage instability problem is caused by chemical dissolution reactions that are commonly encountered in the upper crust of the Earth, so that it can be called the chemical-dissolution-driven seepage instability problem. After the mathematical governing equations of and computational methods for these two kinds of seepage instability problems are introduced, two numerical examples are used to elucidate how and why these two kinds of seepage instabilities can provide favorable places for the formation of large mineralisation patterns within the upper crust of the Earth. The related computational simulation results have demonstrated that: (1) the convective pore-fluid flow caused by the buoyancy-driven seepage instability not only can dissolve minerals at the lower part of the upper crust, but also can transport the dissolved minerals from the lower part to the upper part of the upper crust, resulting in large mineralisation patterns near the surface of the Earth's upper crust. (2) The chemical-dissolution-driven seepage instability in fluid-saturated porous rock can provide some favorable places, such as finger-like channels created by porosity enhancement in the porous rock, for the formation of large mineralisation patterns within the upper crust of the Earth.
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DOI：
10.1007/978-1-4612-0575-3_12
发表时间：
1998
期刊：
--
影响因子：
--
作者：
B. Reddy
通讯作者：
B. Reddy
矿化计算流体动力学的一些基本问题：综述
影响因子：
3.9
作者：
Zhao, Chongbin;Reid, L. B.;Regenauer-Lieb, R.
通讯作者：
Regenauer-Lieb, R.
DOI：
10.1007/978-0-387-76543-3_4
发表时间：
2008
期刊：
--
影响因子：
--
作者：
B. Straughan
通讯作者：
B. Straughan
DOI：
10.1017/s0305004100032692
发表时间：
1957-07
影响因子：
0.8
作者：
J. Hammersley
通讯作者：
J. Hammersley
影响因子：
7.4
作者：
E. C. Childs
通讯作者：
E. C. Childs