Effect of clay mineralogy and pore fluid chemistry on fluid flow in fault zones

粘土矿物学和孔隙流体化学对断层带流体流动的影响

• 批准号: 84562314
• 负责人: Dr. Julia Behnsen
• 金额: --
• 依托单位: Department of Earth and Ocean Sciences
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/84562314?language=en
• 关键词: Effect; clay; mineralogy; pore; fluid

Understanding the role of faults in controlling subsurface fluid flow is of critical importance for a number of geological applications. Retardation of fluid flow can lead to the development of excess pore fluid pressures which will control fault mechanics and the nucleation of earthquakes. The secure positioning of deep waste repositories and the recovery of hydrocarbons from structurally complex reservoirs also depends on detailed understanding of subsurface fluid flow. Previous studies have suggested that fault rocks that contain clays have significant physicochemical interactions with pore fluids (in particular water) that can affect their permeability and strength at upper crustal levels. The aim of this project is to measure the potential effect of clay mineralogy and pore water chemistry at elevated pressures and temperatures on the permeability of fault rocks. This study will combine a systematic experimental investigation into the effect of mineralogy and pore fluid chemistry on the fluid flow properties of non-swelling clays under high pressure and elevated temperatures with microstructural observations and mineralogical characterization of naturally-occurring clay-bearing fault rocks. The results will be used to develop and enhance models of fluid flow through fault zones.

了解断层在控制地下流体流动中的作用对于许多地质应用是至关重要的。流体流动的阻滞可导致超孔隙流体压力的发展，超孔隙流体压力将控制断层力学和地震成核。深层废物储存库的安全定位和从结构复杂的储层中回收碳氢化合物也取决于对地下流体流动的详细了解。以前的研究表明，含有粘土的断层岩与孔隙流体（特别是水）有显着的物理化学相互作用，可以影响其渗透率和强度在地壳上层。该项目的目的是测量粘土矿物学和孔隙水化学在升高的压力和温度下对断层岩渗透性的潜在影响。本研究将联合收割机结合矿物学和孔隙流体化学对高压和高温下非膨胀粘土流体流动性质的影响的系统实验研究，以及对天然含粘土断层岩的显微结构观察和矿物学表征。研究结果将用于开发和增强通过断层带的流体流动模型。