Kuujjuaq (Nunavik, Canada)结晶基底岩裂缝滑动激活电位评价地热系统开发

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY Geosciences (Switzerland) Pub Date : 2023-11-07 DOI:10.3390/geosciences13110340
Mafalda M. Miranda, Ali Yaghoubi, Jasmin Raymond, Andrew Wigston, Maurice B. Dusseault
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引用次数: 0

摘要

这项工作对位于加拿大地盾岩石上的偏远北部社区现有裂缝的滑动激活潜力进行了估计,用于地热目的。为了实现这一目标,我们分析了露头类似物,并记录了裂缝的几何性质,即走向和倾角。然后,我们通过经验方法估计了研究区的应力状态,并进行了概率滑移趋势分析。这使我们能够确定现有裂缝在当前应力状态下的滑动概率、最有可能被激活的裂缝的方向以及激活现有裂缝所需的流体压力,这些都是开发增强型地热系统的关键方面。这种简单而有效的分析结果表明,在目前的应力状态下,现有的天然裂缝相对稳定,大约需要12.5 MPa/km的注入压力才能激活最优定向的裂缝。在此压力梯度下注水可以打开现有裂缝的最佳定向,提高储层的渗透率,从而有利于地热流体的开采。本文所描述的信息为正在进行的偏远北部社区地热研究提供了重大贡献。
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Slip Activation Potential of Fractures in the Crystalline Basement Rocks of Kuujjuaq (Nunavik, Canada) to Assess Enhanced Geothermal Systems Development
This work presents an estimate of the slip activation potential of existing fractures in a remote northern community located on Canadian Shield rocks for geothermal purposes. To accomplish this objective, we analyzed outcrop analogues and recorded geometrical properties of fractures, namely the strike and dip. Then, we estimated the stress regime in the study area through an empirical approach and performed a probabilistic slip tendency analysis. This allowed us to determine the slip probability of the pre-existing fractures at the current state of stress, the orientation of fractures that are most likely to be activated and the fluid pressures needed for the slip activation of pre-existing fractures, which are key aspects for developing Enhanced Geothermal Systems. The results of this simple, yet effective, analysis suggest that at the current state of stress, the pre-existing natural fractures are relatively stable, and an injection pressure of about 12.5 MPa/km could be required to activate the most optimally oriented fractures to slip. An injection of water at this pressure gradient could open the optimally oriented pre-existing fractures and enhance the permeability of the reservoir for geothermal fluid extraction. The information described in this paper provides a significant contribution to the geothermal research underway in remote northern communities.
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来源期刊
Geosciences (Switzerland)
Geosciences (Switzerland) Earth and Planetary Sciences-Earth and Planetary Sciences (all)
CiteScore
5.30
自引率
7.40%
发文量
395
审稿时长
11 weeks
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