马菲格形成中的断裂拓学:对地质碳储存的影响
Andrea Muñoz-Ibáñez1,2, J Carlos Santamarina1
1Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
概括
在玄武岩层中碳矿化提供了有效的二氧化碳封存. 断裂特性和矿物学控制储存能力和长期可行性,需要重新评估大规模部署.
科学领域:
- 地质科学 地质科学
- 地球科学 地球科学 地球科学
- 环境科学 环境科学
背景情况:
- 碳矿化显示出对二氧化碳封存的前景.
- 大规模部署在断裂网络动态和断裂矩阵相互作用方面面临不确定性.
研究的目的:
- 调查二氧化碳储存的玄武岩层中断裂特征.
- 分析断裂网络对二氧化碳封存效率的影响.
主要方法:
- 集成现场数据,数值模拟和重力-体积分析.
- 骨折网络建模和化学重力度分析.
主要成果:
- 断裂孔径与块大小相关,受矿物学影响 (孔径与块大小的比率β:~0.7·10−2到6·10−2).
- 溶解放大了光圈变异性,但六角形拓有助于混合,并延迟了流量定位.
- 矿化将0.2-0.3gCO2/g岩石封存起来,超过孔隙储存,但降低了断裂传导性.
结论:
- 矿物学是断裂拓,反应性和储存能力的关键.
- 体积正矿化导致孔径关闭,取决于β和矿化膨胀因子 ε (7-24%反应体积).
- 重新评估地岩中的二氧化碳储存能力至关重要.
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