Cascadia盆地深海玄武岩CO2注入断层滑动趋势分析

IF 6.5 3区 工程技术 Q1 ENGINEERING, GEOLOGICAL Georisk-Assessment and Management of Risk for Engineered Systems and Geohazards Pub Date : 2023-04-23 DOI:10.3390/geohazards4020008
E. Ekpo Johnson, M. Scherwath, K. Moran, S. Dosso, K. Rohr
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引用次数: 2

摘要

近海玄武岩,最常见的是在洋中脊形成的海洋地壳,估计提供了一个几乎无限的二氧化碳封存库,被认为是最持久的碳封存地点之一,因为注入的二氧化碳会矿化,形成碳酸盐岩。作为固体碳项目的一部分,Cascadia盆地距离加拿大温哥华岛西海岸约200公里,作为地质二氧化碳封存地点的潜力进行了调查。为了预测将要进行的演示,有必要评估该地区的地质断层在二氧化碳注入的情况下滑动的趋势,这可能会导致地震事件。为了了解水库的生存能力,我们对建议的选址区域进行了定量的风险评估。这包括对拟注入部位的详细描述,以了解基线应力和压力条件,并识别可能发生滑动的单个断层或断裂带,从而产生地震活动。结果表明,当注入量达到~2.5 MT/yr时,断层滑动电位最小(小于1%)。这部分是由于玄武岩含水层的厚度及其渗透性。研究结果可为类似海洋玄武岩盆地CO2注入地震潜在风险评估提供参考。
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Fault Slip Tendency Analysis for a Deep-Sea Basalt CO2 Injection in the Cascadia Basin
Offshore basalts, most commonly found as oceanic crust formed at mid-ocean ridges, are estimated to offer an almost unlimited reservoir for CO2 sequestration and are regarded as one of the most durable locations for carbon sequestration since injected CO2 will mineralize, forming carbonate rock. As part of the Solid Carbon project, the potential of the Cascadia Basin, about 200 km off the west coast of Vancouver Island, Canada, is investigated as a site for geological CO2 sequestration. In anticipation of a demonstration proposed to take place, it is essential to assess the tendency of geologic faults in the area to slip in the presence of CO2 injection, potentially causing seismic events. To understand the viability of the reservoir, a quantitative risk assessment of the proposed site area was conducted. This involved a detailed characterization of the proposed injection site to understand baseline stress and pressure conditions and identify individual faults or fault zones with the potential to slip and thereby generate seismicity. The results indicate that fault slip potential is minimal (less than 1%) for a constant injection of up to ~2.5 MT/yr. This is in part due to the thickness of the basalt aquifer and its permeability. The results provide a reference for assessing the potential earthquake risk from CO2 injection in similar ocean basalt basins.
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来源期刊
CiteScore
8.70
自引率
10.40%
发文量
31
期刊介绍: Georisk covers many diversified but interlinked areas of active research and practice, such as geohazards (earthquakes, landslides, avalanches, rockfalls, tsunamis, etc.), safety of engineered systems (dams, buildings, offshore structures, lifelines, etc.), environmental risk, seismic risk, reliability-based design and code calibration, geostatistics, decision analyses, structural reliability, maintenance and life cycle performance, risk and vulnerability, hazard mapping, loss assessment (economic, social, environmental, etc.), GIS databases, remote sensing, and many other related disciplines. The underlying theme is that uncertainties associated with geomaterials (soils, rocks), geologic processes, and possible subsequent treatments, are usually large and complex and these uncertainties play an indispensable role in the risk assessment and management of engineered and natural systems. Significant theoretical and practical challenges remain on quantifying these uncertainties and developing defensible risk management methodologies that are acceptable to decision makers and stakeholders. Many opportunities to leverage on the rapid advancement in Bayesian analysis, machine learning, artificial intelligence, and other data-driven methods also exist, which can greatly enhance our decision-making abilities. The basic goal of this international peer-reviewed journal is to provide a multi-disciplinary scientific forum for cross fertilization of ideas between interested parties working on various aspects of georisk to advance the state-of-the-art and the state-of-the-practice.
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