...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Greenhouse Gas Control >Fault friction and slip stability not affected by CO_2 storage: Evidence from short-term laboratory experiments on North Sea reservoir sandstones and caprocks
【24h】

Fault friction and slip stability not affected by CO_2 storage: Evidence from short-term laboratory experiments on North Sea reservoir sandstones and caprocks

机译：断层摩擦和滑动稳定性不受CO_2储集的影响：北海储层砂岩和盖层的短期实验室实验证据

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We conducted velocity stepping direct-shear experiments on 5 separate simulated fault gouges made using 3 caprock samples, 1 reservoir rock, and 1 mixture of reservoir and caprock. Our aim was to understand the frictional strength and velocity dependent slip behavior of faults within and lateral to a potential pilot CO_2 sequestration reservoir situated in the Netherlands sector of the North Sea. To analyze fault mechanical properties prior to CO_2 injection, and to gain an understanding of the potential short-term influence of CO_2 after injection, experiments were conducted under a variety of pore fluid conditions; dry, dry-pressurized with supercritical CO_2, brine-saturated, and brine-saturated plus pressurized with supercritical CO_2. Experiments were conducted at in situ effective stress (35MPa) and temperature (115°C) for the potential pilot project. Results indicate that the coefficient of friction (/z) for the studied caprock material is highly dependent on mineralogy, with [i increasingas a result of increasing quartz content and concomitant decrease in clay content. Quartz-rich reservoir rock exhibited the highest value for [i, and a 50/50 (wt.%) mixture of caprock and reservoir rock showed ii values lying directly between those of the two end-member compositions (0.47 and 0.61). Saturation of clay-rich gouges with a brine solution led to weakening compared to dry gouges, whereas quartz rich gouges showed no clear weakening upon brine saturation. The addition of supercritical CO_2 todry and to brine saturated gouges had no clear influence on frictional strength. The friction rate parameter (a - b) as defined by the rate- and state-dependent friction laws was measured in low shear velocity steps (0.2-1-10-1-0.2 jxm/s) for all materials and pore fluid conditions, and indicates that all tested materials exhibit predominantly velocity strengthening behavior, and that neither the addition of brine nor supercritical CO_2 has any clear, strong influence on friction velocity dependence, indicating that reservoir faults should behave aseismically both before and after the addition of CO_2.
机译：我们对5个单独的模拟断层泥进行了速度步进直接剪切实验，这些断层泥是由3个盖层样品，1个储层岩石以及1个储层和盖层混合物制成的。我们的目的是了解位于北海荷兰部分的潜在先导CO_2封存油藏内部和侧面的断层与摩擦强度和速度有关的滑动行为。为了分析注入CO_2之前的断层力学性能，并了解注入后CO_2的潜在短期影响，在各种孔隙流体条件下进行了实验。干燥，用超临界CO_2进行干压，饱和盐水和饱和盐水再加上用超临界CO_2进行加压。对于潜在的试点项目，在现场有效应力（35MPa）和温度（115°C）下进行了实验。结果表明，所研究的盖层材料的摩擦系数（/ z）高度依赖于矿物学，[i由于石英含量的增加和黏土含量的降低而增加。富含石英的储层岩石的[i]值最高，而盖层和储层岩石的50/50（wt。％）混合物的ii [ii]值正好位于两个端构件组成的中间值（0.47和0.61）。与干法相比，富含粘土的凿子用盐水溶液饱和会导致削弱，而石英质的凿子在盐水饱和后没有明显减弱。向干粉中加入超临界CO_2并添加到饱和盐水中对摩擦强度没有明显影响。由速率和状态决定的摩擦定律定义的摩擦速率参数（a-b）是在所有材料和孔隙流体条件下，以低剪切速度步长（0.2-1-10-1-0.2 jxm / s）测量的，并表明所有测试材料均表现出主要的速度强化行为，并且盐水和超临界CO_2的添加均未对摩擦速度依赖性产生任何明显而强烈的影响，表明储层断层在添加CO_2之前和之后均应具有抗震性能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号