零偏移VSP监测CO2储存:阻抗反演和楔形建模在Ketzin试点站点

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS
Julia Götz, S. Lüth, C. Krawczyk, C. Cosma
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引用次数: 16

摘要

在位于德国柏林以西35公里的Ketzin镇附近的二氧化碳储存试验点,630米至650米深度的砂岩储层很薄且不均匀。零偏移VSP测量的延时分析表明,在近井走廊叠上可以观察到co2引起的振幅变化。此外,我们还研究了监测数据中二氧化碳引起的振幅变化是否可以用于推导控制盐水饱和砂岩含水层中二氧化碳迁移的几何和岩石物理参数。进行了二维地震弹性建模,以测试处理工作流程,并进行楔形建模研究,以估计CO2羽流的垂直扩展。当使用NRMS误差来衡量模拟和记录的重复轨迹之间的相似性时,在厚度为8 m的储层砂岩中,羽流厚度为6-7 m达到了最佳匹配。通过带限阻抗反演,发现受套管混响和CO2注入的影响,储层顶部的速度降低了30%。地震振幅与CO2饱和层厚度的关系以及CO2引起的纵波速度变化是量化注入CO2体积的重要参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site
At the CO2 storage pilot site near the town of Ketzin (35 km west of Berlin, Germany) the sandstone reservoir at 630 m–650 m depth is thin and heterogeneous. The time-lapse analysis of zero-offset VSP measurements shows that CO2-induced amplitude changes can be observed on near-well corridor stacks. Further, we investigate whether CO2-induced amplitude changes in the monitoring data can be used to derive geometrical and petrophysical parameters governing the migration of CO2 within a brine saturated sandstone aquifer. 2D seismic-elastic modelling is done to test the processing workflow and to perform a wedge modelling study for estimation of the vertical expansion of the CO2 plume. When using the NRMS error as a measure for the similarity between the modelled and recorded repeat traces, the best match is achieved for a plume thickness of 6-7 m within the reservoir sandstone of 8 m thickness. With band limited impedance inversion a velocity reduction at the top of the reservoir of 30%, influenced by casing reverberations as well as CO2 injection, is found. The relation of seismic amplitude to CO2 saturated layer thickness and CO2-induced changes in P-wave velocities are important parameters for the quantification of the injected CO2 volume.
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来源期刊
International Journal of Geophysics
International Journal of Geophysics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.50
自引率
0.00%
发文量
12
审稿时长
21 weeks
期刊介绍: International Journal of Geophysics is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of theoretical, observational, applied, and computational geophysics.
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