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首页> 外文期刊>International Journal of Greenhouse Gas Control >Geoelectrical methods for monitoring geological CO sub(2) storage: First results from cross-hole and surface-downhole measurements from the CO sub(2)SINK test site at Ketzin (Germany)
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Geoelectrical methods for monitoring geological CO sub(2) storage: First results from cross-hole and surface-downhole measurements from the CO sub(2)SINK test site at Ketzin (Germany)

机译：监测地质CO sub（2）储存的地电方法：来自Ketzin（德国）CO sub（2）SINK测试地点的跨孔和井下测量的第一结果

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摘要

The feasibility of monitoring CO sub(2) migration in a saline aquifer at a depth of about 650 m with cross-hole and surface-downhole electrical resistivity tomography (ERT) is investigated at the CO sub(2)SINK test site close to Ketzin (Germany). The permanent vertical electrical resistivity array (VERA) consists of 45 electrodes (15 in the injection well Ktzi201 and 15 in each of the two observation wells Ktzi200 and Ktzi202), successfully placed on the electrically insulated casings, in the depth range of about 590-740 m with a spacing of about 10 m. The three Ketzin wells are arranged as perpendicular triangle with distances of 50 and 100 m. First synthetic modelling studies indicate an increase of the electrical resistivity of about 200% caused by CO sub(2) injection, corresponding to a bulk CO sub(2) saturation of 50%, which is in good agreement with laboratory studies. Finite difference inversion of field data delivers three-dimensional resistivity distributions between the wells which are consistent with the reservoir modelling studies. To increase the limited observation area provided by the cross-hole measurements, additional surface-downhole measurements were deployed. A main CO sub(2) migration in SE-NW direction is deduced from surface to downhole resistivity experiments. The first cross-hole time-lapse results show that the resolution and the coverage of the electrode array in the Ketzin setting are sufficient to resolve the expected resistivity changes on the characteristic length scale of the electrode array. Significant resistivity changes could be measured, however, detailed information on the CO sub(2) plume could not be resolved yet by VERA under the existing geological circumstances.
机译：在靠近Ketzin的CO sub（2）SINK测试现场研究了使用横孔和表面-井下电阻率层析成像（ERT）监测约650 m深度的盐水层中CO sub（2）迁移的可行性。 （德国）。永久垂直电阻率阵列（VERA）由45个电极（注入井Ktzi201中的15个，两个观察井Ktzi200和Ktzi202中的15个）成功地放置在电绝缘套管上，深度范围约为590- 740 m，间隔约10 m。三个Ketzin井以垂直三角形排列，距离分别为50和100 m。最初的综合建模研究表明，由于注入CO sub（2）导致电阻率增加了约200％，相当于CO sub（2）的整体饱和度为50％，这与实验室研究非常吻合。现场数据的有限差分反演在井之间提供三维电阻率分布，这与储层建模研究一致。为了增加跨孔测量提供的有限观察面积，部署了额外的地下井下测量。从表面到井下电阻率实验推导了主要的CO sub（2）沿SE-NW方向迁移。第一个交叉孔延时结果显示，在Ketzin设置中，电极阵列的分辨率和覆盖范围足以解决电极阵列特征长度尺度上的预期电阻率变化。可以测量出明显的电阻率变化，但是，在现有地质情况下，VERA仍无法解决有关CO sub（2）羽流的详细信息。

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