Monitoring of the gas composition and stable carbon isotopes during side track drilling in Ktzi 203 at the Ketzin CO2 storage pilot site, Germany
Monitoring of the gas composition and stable carbon isotopes during side track drilling in Ktzi 203 at the Ketzin CO2 storage pilot site, Germany
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德国 Ketzin CO2 封存试验场 Ktzi 203 侧钻钻井过程中气体成分和稳定碳同位素的监测
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
A. Liebscher
中科院分区：
文献类型：
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作者：
M. Zimmer;A. Szizybalski;B. Norden;A. Vieth‐Hillebrand;A. Liebscher
抽象的。2004年至2017年间，二氧化碳在深海中的储存量
在Ketzin试验场地，
柏林。该系列研究项目，由GFZ德国协调
地球科学研究中心，还包括一个跨学科的
在储存过程的所有阶段进行科学监测，
提供了一个可靠的洞察二氧化碳的整体行为，
储存在地下。在Ktzi 203观测井废弃和固井之前，
从643.1至662.6 m和从624.5至654.5 m取芯侧轨，
分别钻探的部分包括从盖层开始的过渡带
岩石（威悉河组）到斯图加特组的储层，
暴露在注入的二氧化碳中超过九年。期间
在钻井作业中，
泥浆气体分离器、质谱仪和CO2同位素分析仪，
连续分离和分析提取的气体。岩芯是
用塑料箔收缩包装以收集放电气体。盖层中的CO2浓度相对较低，
同位素组成与典型上三叠统地层基本雅阁
没有证据表明二氧化碳从
把下面的储层注入盖层二氧化碳的明显增加
盖层之间的δ13CCO2浓度和位移
并且储层指示了注入的CO2在
砂岩地层与五年来收集的样本进行比较，
在2012年早些时候，显示出类似的浓度和同位素深度趋势，
这表明在深度处有一个相当停滞的二氧化碳羽流，
以及盖层和井眼固井的完整性。
Abstract. Between 2004 and 2017 the storage of CO2 in a deep
saline aquifer was investigated in detail at the Ketzin pilot site close to
Berlin. The series of research projects, coordinated by the GFZ German
Research Centre for Geosciences, also incorporated an interdisciplinary
scientific monitoring program during all phases of the storage process which
provided a reliable insight into the overall behaviour of CO2 during
storage in the underground. Prior to abandonment and cementing of the Ktzi 203 observation well, two
side tracks were cored from 643.1 to 662.6 m and from 624.5 to 654.5 m,
respectively. The drilled sections included the transition zone from the cap
rock (Weser Formation) to the reservoir in the Stuttgart Formation which had
been exposed to the injected CO2 for more than nine years. During the
drilling operation continuous mud gas logging was performed by applying a
mud gas separator, a mass spectrometer and a CO2 isotope-analyser for
continuous separation and analyses of the extracted gas. Drill cores were
shrink-wrapped with plastic foil to collect discharging gases. CO2 concentrations in the cap rock were relatively low and their
isotopic compositions were in accord with typical Upper Triassic formation
fluids providing no evidence for a significant CO2 infiltration from
the underlying reservoir into the cap rock. A clear increase in the CO2
concentration and a shift in δ13CCO2 between the cap rock
and the reservoir indicated the presence of the injected CO2 in the
sandstone formation. The comparison with samples collected five years
earlier in 2012 showed similar concentrations and isotopic depth trends
which indicate a rather stagnant CO2 plume at depth and the tightness
and integrity of the cap rock and the borehole cementing.