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钻孔的瞬变电磁监测技术，用于地下CO2的封存。具有挑战性的方面是随着时间的推移测量的可重复性和理解导致CO2储层电导率变化的过程。为了保证可重复性，证明测量系统的时间稳定性至关重要。因此，我们调查的时间行为的测量系统所产生的组装和拆卸的测量设置在一个已知的现场与固定的调查布局的影响。重复测量也将有助于了解季节对记录数据的影响。我们的虚拟电磁实验表明，由于注入600吨CO2，预计位于阿尔伯塔（加拿大）布鲁克斯的CO2现场研究站的变化将大于5%。现场复测的目的是证明瞬变电磁法基本上适用于探测封存过程。最后，我们调查的空间重建的CO2注入使用我们的三维反演软件的可能性。