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Mechanism of fracture permeability in crystalline rock under controlled stress and temperature conditions

受控应力和温度条件下结晶岩石裂缝渗透率机制

基本信息

批准号：
21560521
负责人：
KINOSHITA Naoki
金额：
$ 2.91万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2009
资助国家：
日本
起止时间：
2009 至 2011
项目状态：
已结题

项目摘要

In this study, flow-through experiments on a single fracture in granite has been carried out under confining pressures of 5-10 MPa, and at temperatures of 20-90℃. The fracture aperture and the permeability monotonically decreased with time at room temperature, and reached a quasi-steady state. Then, after the temperature was raised to 90℃, the aperture decreased again throughout the rest of the experiments. Fluid samples were taken from the outlet to examine the elemental concentrations that were evaluated by inductively-coupled plasma atomic emission spectrometry(ICP-AES). The elemental concentrations increased with increase of temperature. After the flow-through experiments, the fracture surface was observed by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy(SEM-EDX). The formation of a few kinds of precipitated minerals such as silica and calcite was revealed. The precipitation was limited to quite local and small areas. However, the precipitated minerals seemed to have had some influences on the permeability.

本文在温度20-90℃、围压5-10 MPa条件下，对花岗岩单裂隙进行了渗流实验。在室温下，裂缝开度和渗透率随时间单调下降，并达到准稳态。然后，在温度升高到90℃后，孔径在其余实验中再次减小。从出口采集流体样品，以检查通过电感耦合等离子体原子发射光谱法（ICP-AES）评估的元素浓度。元素浓度随温度的升高而增加。在流过实验之后，通过扫描电子显微镜结合能量色散X射线光谱（SEM-EDX）观察断裂表面。研究表明，在沉积过程中，有少量沉淀矿物形成，如硅石、方解石等。降水仅限于相当局部和小的地区。然而，沉淀的矿物似乎对渗透性有一些影响。