Natural analogues: a potential approach for developing reliable monitoring methods to understand subsurface CO2 migration processes
Natural analogues: a potential approach for developing reliable monitoring methods to understand subsurface CO2 migration processes
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DOI：
10.1007/s12665-012-1701-4
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发表时间：
2012-05
影响因子：
2.8
通讯作者：
C. Schütze;U. Sauer;K. Beyer;H. Lamert;K. Bräuer;G. Strauch;C. Flechsig;H. Kämpf;P. Dietrich
中科院分区：
文献类型：
--
作者：
C. Schütze;U. Sauer;K. Beyer;H. Lamert;K. Bräuer;G. Strauch;C. Flechsig;H. Kämpf;P. Dietrich
减少化石燃料燃烧产生的二氧化碳 (CO2) 排放的一种可能方法是使用二氧化碳捕获和储存 (CCS) 技术。然而，公众对地质圈二氧化碳封存的看法普遍持负面态度，尤其是受到泄漏风险的影响。因此，试图获得公众认可时的一个主要问题是确保提供适当的监测措施，旨在提供健康、安全和环境风险评估，从而最大限度地减少二氧化碳封存的潜在风险。天然存在的二氧化碳沉积物为评估和验证用于检测和监测二氧化碳扩散和脱气到大气中的方法提供了独特的天然类似物。 Cheb 盆地（捷克共和国波希米亚西北部）的地质和水文结构代表了调查二氧化碳泄漏的天然类似物，并提供了一个完美的位置来验证用于直接调查沿优先迁移路径的过程的监测工具。这个浅盆地可追溯至第三纪，其特点是厚达 300 米的新近纪沉积物和多个构造活动断层。本文的目的是介绍 CO2 类似物的概念，将埃格尔裂谷作为天然 CO2 类似物地点的合适位置，并证明应在多大程度上使用此类类似物地点（通过案例研究）。该案例研究介绍了地电测量与土壤二氧化碳浓度和通量测定方法联合应用所获得的结果，用于检测和表征气体渗漏处自然二氧化碳释放（作为分层监测概念的一部分）。强调近地表特征的放电控制结构是地电测量应用的最初动机。土壤气体浓度和通量测量技术使用起来相对简单，并且是可用于监测沿优先路径渗透的二氧化碳的有价值的方法。两种方法的联合解释首次深入了解了流体路径，并揭示了特定地点近地表沉积物的厚度和渗透率对地表二氧化碳脱气模式的空间分布有很大影响。
One possible way of mitigating carbon dioxide (CO2) emissions from fossil fuel combustion is using carbon dioxide capture and storage (CCS) technology. However, public perception concerning CO2storage in the geosphere is generally negative, being particularly motivated by perceived leakage risks. Therefore, a main issue when attempting to gain public acceptance is ensuring provision of appropriate monitoring practices, aimed at providing health, safety and environmental risk assessment, so that potential risks from CO2storage are minimized. Naturally occurring CO2deposits provide unique natural analogues for evaluating and validating methods used for the detection and monitoring of CO2spreading and degassing into the atmosphere. Geological and hydrological structures of the Cheb Basin (NW Bohemia, Czech Republic) represent such a natural analogue for investigating CO2leakage and offer a perfect location at which to verify monitoring tools used for direct investigation of processes along preferential migration paths. This shallow basin dating from the Tertiary age is characterized by up to 300 m thick Neogene sediment deposits and several tectonically active faults. The objectives of this paper are to introduce the CO2analogues concept to present the Eger Rift as a suitable location for a natural CO2analogue site and to demonstrate to what extent such an analogue site should be used (with a case study). The case study presents the results obtained from a joint application of geoelectrical measurements in combination with soil CO2concentration and flux determination methods, for the detection and characterization of natural CO2releases at gas seeps (as part of a hierarchic monitoring concept). To highlight discharge-controlling structural near surface features was the initial motivation for the application of geoelectrical measurements. Soil-gas concentration and flux measurement techniques are relatively simple to employ and are valuable methods that can be used to monitor seeping CO2along preferential pathways. Joint interpretation of both approaches yields a first insight into fluid paths and reveals that the thickness and permeability of site-specific near surface sedimentary deposits have a great influence upon the spatial distribution of the CO2degassing pattern at surface level.