来自Skoll High,Vøring Margin的带状玄武岩样本中的流体流动行为
Peter Betlem1,2,3, Marija Plahter Rosenqvist4, John Millett3,5,6
1Norwegian Geotechnical Institute, Ullevaal Stadion, P.O. Box 3930, 0806 Oslo, Norway.
概括
改变的玄武岩中的流体流动是碳捕获的关键. 膨胀的粘土显著降低了盐水的流量,警告不要使用地下条件的气体透性数据.
科学领域:
- 地质地质地质地质地质地
- 地质物理学 地质物理学
- 地球科学 地球科学 地球科学
背景情况:
- 关于中挪威边缘的玄武岩水库和流动性质的研究有限.
- 地表条件和现场流体流动对孔流体变化的反应对碳捕集至关重要,但研究不足.
- 岩岩流是碳捕集的潜在储库,需要了解它们的液压特性.
研究的目的:
- 在模拟的地下条件下,研究从Skoll High,Vøring Margin流出的玄武岩流的流体流动特性.
- 为了评估变化和孔隙流体对这些玄武岩的水力性能的影响,用于碳捕集应用.
- 为了比较现场盐水流量与环境气体透度测量.
主要方法:
- 从IODP地点U1571/U1572.收集了32个岩流样本.
- 在环境条件下测量液压性能 (孔径,透性).
- 在使用X射线微型计算机断层扫描 (μCT) 的代表样本上进行了多压力,多流体核心洪水实验.
主要成果:
- 石化分析显示,二级粘土 (smectite) 的孔发生了显著的变化.
- 的多孔性通常低于透值.
- 克林肯伯格校正的气透度显示与孔隙度的相关性很弱,没有深度依赖.
- 盐水的透率比气体的透率低四个数量级.
- 二氧化碳注入并没有显著减少盐水流量;盐水引起的粘土胀减少了流体的可访问性.
结论:
- 环境气体透度测量可能不能准确地反映改变基岩的现场流体流.
- 在改变的囊基岩中,膨胀的粘土和低矩阵透性可能会限制碳捕集的注入性.
- 在这些玄武岩层中,骨折可能对显著的液体注射性至关重要.
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