Impact and detectability of hypothetical CCS offshore seep scenarios as an aid to storage assurance and risk assessment
Impact and detectability of hypothetical CCS offshore seep scenarios as an aid to storage assurance and risk assessment
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DOI：
10.1016/j.ijggc.2019.102949
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发表时间：
2020-04
影响因子：
3.9
通讯作者：
J. Blackford;G. Alendal;H. Avlesen;A. Brereton;P. Cazenave;Baixin Chen;M. Dewar;J. Holt;J. Phelps
中科院分区：
文献类型：
--
作者：
J. Blackford;G. Alendal;H. Avlesen;A. Brereton;P. Cazenave;Baixin Chen;M. Dewar;J. Holt;J. Phelps
碳捕集与封存有可能对减缓气候变化作出重大贡献，但监管和社会有义务证明封存的稳定期和对当地环境的影响最小。这需要了解潜在的环境影响和一系列假设泄漏情况的可检测性。在缺乏重要的真实世界释放实验的情况下，本研究整理了来自五个不同模型系统的86个近海海洋释放模拟情景的结果。这一综合证明了泄漏率、可探测性和二氧化碳储存中广泛假设释放的影响潜力之间的一致的广义关系，可以用幂律来描述。例如，每天1 T量级的泄漏至少可以在60 米的距离内检测到，对环境的影响被限制在泄漏点半径15 米以内。小的释放可能需要底部安装（着陆器）监测以确保检测。总之，当与泄漏风险的量化相结合时，这项工作可以提供一级环境影响评估，作为同意过程的辅助。此外，这项工作表明，如果采用适当的监测策略，可以在远低于会破坏存储性能或显著影响环境的阈值时检测到非灾难性释放事件。
Carbon Capture and Storage has the potential to make a significant contribution to the mitigation of climate change, however there is a regulatory and societal obligation to demonstrate storage robustness and minimal local environmental impact. This requires an understanding of environmental impact potential and detectability of a range of hypothetical leak scenarios. In the absence of a significant body of real-world release experiments this study collates the results of 86 modelled scenarios of offshore marine releases derived from five different model systems. This synthesis demonstrates a consistent generalised relationship between leak rate, detectability and impact potential of a wide range of hypothetical releases from CO2storage, which can be described by a power law. For example a leak of the order of 1 T per day should be detectable at, at least, 60 m distance with an environmental impact restricted to less than a 15 m radius of the release point. Small releases are likely to require bottom mounted (lander) monitoring to ensure detection. In summary this work, when coupled with a quantification of leakage risk can deliver a first order environmental impact assessment as an aid to the consenting process. Further this work demonstrates that non-catastrophic release events can be detected at thresholds well below levels which would undermine storage performance or significantly impact the environment, given an appropriate monitoring strategy.