高温三轴应力状态下岩石渗透特性试验研究

发布时间：2018-06-04 21:28

  本文选题：岩石力学 + 石灰岩　； 参考：《太原理工大学》2017年硕士论文

【摘要】：渗透率是岩石材料的一种重要运输特性,它直接反映了岩石材料通过流体的能力。岩石渗透特性的研究对油气藏开采,地下水资源开发和工程岩体稳定性具有重要作用,因此引起了石油地质、水文地质等地质专家的广泛关注。对于岩石渗透特性,目前的主要研究手段是室内试验。目前,对于岩石在常温、三轴应力状态下渗透率的测定技术已经相对成熟,与之相关的研究也相对深入。国内外学者对温度作用下岩石渗透特性的变化规律已经进行了大量的试验研究,然而,在高温三轴应力状态下岩石渗透特性尚处于研究之中,在三轴应力状态下温度(高温阶段)与岩石渗透率的关系仍存在争议。因此,目前对三轴应力状态下岩石渗透特性的研究尚不够深入,仅限于理论分析和根据统计规律获得的经验公式。本文利用太原理工大学采矿工艺研究所自主研发的高温真三轴试验机,采用实时加热的方式模拟石灰岩、砂岩高温(100℃~400℃)三轴应力状态,采用稳态法对石灰岩和砂岩在不同温度段的渗透率进行了在线测定,并利用热弹性理论对其进行分析,同时从岩石细观结构变化和力学性质变化方面对试验结果进行分析验证。研究表明:在三轴应力状态下,由于热膨胀变形和热破裂的综合作用,三轴应力状态下石灰岩和砂岩渗透率随温度的变化规律具有非线性特征:在较低温度段岩石渗透率随温度升高而减小;在中间温度段,岩石渗透率随温度升高而增大;在较高温度段,岩石渗透率随温度升高趋于平缓。该研究结果对油气藏开采,地下水资源开发和工程岩体稳定性具有重要理论价值。
[Abstract]:Permeability is an important transport characteristic of rock material, which directly reflects the ability of rock material to pass through fluid. The study of rock permeability characteristics plays an important role in the exploitation of oil and gas reservoirs, the development of groundwater resources and the stability of engineering rock mass, which has aroused the widespread concern of geological experts such as petroleum geology, hydrogeology and so on. At present, the main research means of rock permeability is laboratory test. At present, the measurement technology of rock permeability at room temperature and triaxial stress state has been relatively mature, and the related research is relatively deep. Scholars at home and abroad have done a lot of experimental research on the variation of rock permeability characteristics under the action of temperature, however, the permeability characteristics of rock under high temperature triaxial stress state are still under study. The relationship between temperature (high temperature stage) and rock permeability under triaxial stress is still controversial. Therefore, the research on the permeability characteristics of rock under triaxial stress is not deep enough, and is limited to the theoretical analysis and empirical formulas obtained according to the statistical law. In this paper, a high temperature true triaxial testing machine developed by Institute of Mining Technology of Taiyuan University of Technology is used to simulate the triaxial stress state of limestone and sandstone at 100 鈩，

本文编号：1978888