Electro-kinetic measurements as a function of frequency and rock deformation: theory, experiment, modelling and applications

作为频率和岩石变形函数的电动测量：理论、实验、建模和应用

• 批准号: 261730-2011
• 负责人: Glover, Paul
• 金额: $ 2.4万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=479977
• 关键词: Electro; kinetic; measurements; function; frequency

Fluid flowing through rocks and soils cause an electrical potential to be developed in the opposite direction. This is an electro-kinetic process which may, in future, be extremely useful. The main reason for this is that we can measure the electrical potential within the Earth`s crust from the surface. If we know how the electro-kinetic mechanism works, it should be possible to monitor the flow of fluids deep down. Between 1997 and 2003 a complete steady-state theory of electrical conduction in rocks and soils was developed by Paul Glover (the applicant) and others. Since then the applicant`s research group has made major progress in developing theories that include the microstructural properties of the rocks and soils, and the effect of frequency, and they have constructed devices for measuring both steady-state and frequency-dependent streaming potentials, which is the name given to the induced electrical potentials. The group has applied these advances to fluid flow in volcanoes, geothermal, water and hydrocarbon reservoirs, earthquake mechanisms, rock permeability, transformations between grain diameter and pore radii, and seismoelectric exploration. It is clear that many more applications exist including minitoring of shale gas extraction,and some which are well outside the geosciences, in civil engineering, environmental egineering and even biology and food science. This grant will enable us to (i) make a large number of laboratory measurements of electrokinetic properties for different rocks, sands, soils which are saturated with fluids of different chemistry, salinity and pH, (ii) to make measurements as a function of frequency and grain size, (iii) to make measurements while the rock is being deformed, (iv) to develop theoretical models and test them with the data, (v) to use the data and theory to model and solve problems involving volcanoes, earthquakes, radon gas, permafrost melting, oil, gas and water reservoirs and seismo-electric exploration.

流过岩石和土壤的流体使电势向相反的方向发展。这是一个在未来可能非常有用的电动力学过程。其主要原因是我们可以从地表测量地壳内部的电势。如果我们知道电动力机制是如何工作的，就有可能监测到深层流体的流动。1997年至2003年间，保罗·格洛弗（申请人）和其他人提出了岩石和土壤中导电的完整稳态理论。从那时起，申请人的研究小组在发展理论方面取得了重大进展，包括岩石和土壤的微观结构特性，以及频率的影响，他们已经建造了测量稳态和频率相关流电位的装置，这是感应电位的名称。该小组已将这些进展应用于火山、地热、水和油气储层的流体流动、地震机制、岩石渗透率、颗粒直径和孔隙半径之间的转换以及地震电勘探。很明显，存在更多的应用，包括页岩气开采的监控，以及一些远远超出地球科学的应用，比如土木工程、环境工程，甚至生物和食品科学。这给予(i)将使我们使大量的实验室测量动电的属性不同的岩石,金沙,土壤的饱和液体的不同化学、盐度和pH值,(ii)测量频率和晶粒尺寸的函数,(iii)测量岩石时变形,(iv)发展理论模型与数据和测试它们,(v)使用数据和理论模型和解决问题涉及到火山,地震、氡气、冻土融化、石油、天然气和水库、震电勘探。