Coupled Processes in Inhomogeneous Geological Systems

岩石电耦合系数在石油、天然气和矿产勘探中有着广泛的应用。例子包括井下电阻率和自发电位测量以及地面地球物理自电位剖面。根据岩石的微观性质来解释测量结果，需要对孔隙网络中离子传输机制有详细的了解。地质膜的不均匀性可能是由于矿物混合物的密切混合、沉积和成岩作用，或以页岩中的干酪根等有机表面涂层的形式出现。这些不均匀性可能会显著改变岩石的膜性质。目前还没有系统的研究来调查这种依赖性。这个项目的目标是更好地理解这些非均匀体系中电化学动力学耦合的本质。

The electrical coupling coefficients in rocks are widely used in oil, gas and mineral prospecting. Examples include downhole resistivity and spontaneous potential measurements as well as surface gophysical self-potential profiling. Interpretation of the measurements in terms of microscopic rock properties requires a detailed knowledge of the mechanisms of ion transport in pore networks. Inhomogeneities in geologic membranes can arise as a result of intimate mixing, sedimentation and diagenesis of mixtures of minerals or in the form of organic surface coatings such as kerogen in shales. These inhomogeneities may significantly alter the membrane properties of the rock. No systematic study has been undertaken to investigate this dependence. It is the objective of this project to obtain a better understanding of the nature of electro- chemical-kinetic coupling in these inhomogeneous systems.