Temporal Stability of the Transient Electromagnetic Response with Respect to the Development of Monitoring Techniques

瞬态电磁响应的时间稳定性与监测技术的发展

• 批准号: 400686672
• 负责人: Professor Dr. Klaus Spitzer
• 金额: --
• 依托单位: Institut für Geophysik und Geoinformatik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/400686672?language=en
• 关键词: Temporal; Stability; Transient; Electromagnetic; Response

In this project, we develop a surface-to-borehole-based transient electromagnetic monitoring technique for the sequestration of CO2 within the subsurface. The challenging aspects are the repeatability of the measurements over time and understanding the processes leading to changes in the conductivity of the reservoir by CO2. To guarantee the repeatability it is crucial to prove the temporal stability of the measuring system. We therefore investigate influences on the temporal behavior of the measuring system arising from assembling and disassembling the measurement setup at a known field site with a fixed survey layout. The repeated measurements will also help to understand seasonal effects on the recorded data. Our virtual electromagnetic experiments have shown that, due to the injection of 600 t of CO2, changes > 5% can be expected at the CO2 field research station in Brooks, Alberta (Canada). A repeat survey on site is intended to prove that the transient electromagnetic method is principally suitable to detect the sequestration process. Finally, we investigate the possibilities of spatially reconstructing the CO2 injection using our three-dimensional inversion software.

在这个项目中，我们开发了一种基于地表到孔洞的瞬态电磁监测技术，用于在地下内二氧化碳的隔离。具有挑战性的方面是测量随着时间的推移的重复性，并了解导致二氧化碳电导率变化的过程。为了确保可重复性证明测量系统的时间稳定性至关重要。因此，我们研究了通过固定的调查布局在已知的现场站点组装和拆卸测量设置而产生的测量系统的时间行为的影响。重复测量还将有助于了解对记录数据的季节性影响。我们的虚拟电磁实验表明，由于注入了600吨CO2，在艾伯塔省布鲁克斯（加拿大）的CO2现场研究站中预计会变化> 5％。现场的重复调查旨在证明瞬态电磁方法主要适合检测隔离过程。最后，我们研究了使用我们的三维反转软件对空间重建二氧化碳注入的可能性。