2.5D Inversion and Joint Interpretation of CSEM Data at Sleipner CO2 Storage
2.5D Inversion and Joint Interpretation of CSEM Data at Sleipner CO2 Storage
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Sleipner CO2 封存 CSEM 数据的 2.5D 反演和联合解释
DOI：
10.1016/j.egypro.2017.03.1531
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Vöge
中科院分区：
文献类型：
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作者：
Joonsang Park;G. Sauvin;M. Vöge
本文回顾了在Sleipner CO2储存库上方获得的海洋可控源电磁（CSEM）数据，以进一步研究数据集，并得出海洋可控源电磁（CSEM）用于海上CCS监测的可行性。在这一特定地区，CSEM面临着一些挑战：1)强烈的电波影响（由于区域水深较浅）；2)弱电阻率异常电位；3)海底管网；4)目标深度相当浅。我们还能提取有用的信息；结合地震资料进一步解释CSEM反演结果；并通过应用岩石物理模型提取其在Utsira地层中的电阻率和二氧化碳饱和度。此外，为了尽量减少海底管道对CSEM数据的影响，我们对海底管道网络附近的一些数据和接收器进行了静音处理。计算结果与地震资料吻合较好，估算的CO2总质量与注入资料吻合较好。目前的研究证实，海洋CSEM可以成为海上二氧化碳储存监测的重要和必不可少的工具，但不是单独使用，而是与地震和重力结合使用。最后，在不久的将来，北海的大规模CCS项目将需要大量的基础设施，如海底管道等。这项研究表明，即使有这样的基础设施，CSEM也可以工作。
In this paper, we revisit the marine controlled-source electromagnetic (CSEM) data, acquired above the Sleipner CO2 storage, in order to further study the dataset and conclude the feasibility of marine CSEM for offshore CCS monitoring. There are some challenges with respect to CSEM in this particular area: 1) strong airwave influence (due to regional shallow water depth); 2) potential of weak resistivity anomaly; 3) seabed pipeline network; and 4) rather shallow target depth. We are yet able to extract useful information; interpret further the CSEM inversion results by combining seismic data; and to extract thein situresistivity and saturation of CO2 in the Utsira formation by applying a rock physics model. In addition, to minimize the influence of the seabed pipeline on the CSEM data, we have muted some of data and receivers near the seabed pipeline network. The results show a good agreement with seismic data, and the estimated total mass of CO2 agrees well with the injection data. This current study confirms that the marine CSEM can be an important and essential tool for offshore CO2 storage monitoring, yet not alone but when combined with both seismic and gravity. Finally, near-future large-scale CCS projects in the North Sea would require extensive infra-structures such as seabed pipeline, etc. This study demonstrates that CSEM may work even with such infra-structures in place.