Assessing the carbon sequestration potential of basalt using X-ray micro-CT and rock mechanics
Assessing the carbon sequestration potential of basalt using X-ray micro-CT and rock mechanics
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DOI：
10.1016/j.ijggc.2017.12.008
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发表时间：
2018-03-01
影响因子：
3.9
通讯作者：
Matter, Juerg
中科院分区：
文献类型：
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作者：
Callow, Ben;Falcon-Suarez, Ismael;Matter, Juerg
玄武岩中的矿物碳化为减少大气中人为二氧化碳排放提供了永久储存解决方案。对冰岛CarbFix站点主要玄武岩储层的岩心样品进行3D X射线显微CT（XCT）图像分析，得到的连通孔隙度为2.05-8.76%，反应表面积为0.10-0.33 mm(-1)，垂直渗透率（2.07 x 10(-10) m(2)）高于水平渗透率（5.10 x）。 10（-11）米（2））。计算表明 CarbFix 试点站点的二氧化碳储存容量为 0.33 十亿吨。将 XCT 结果与应用于同一样品的流体力学测试获得的结果进行比较，在流体力学测试期间，在实际储层压力条件下测量渗透率、电阻率和体积变形。研究发现，渗透率对应力高度敏感，体积变形变化 -0.02% 时渗透率下降两个数量级，相当于平均孔径减小 5 μm。根据 XCT 分析，这种孔隙收缩不足以解释渗透率的降低，除非与粘土膨胀和次生矿物孔隙堵塞的影响相结合。这些发现为未来玄武岩地层中二氧化碳封存的升级和优化提供了重要的基准数据。
Mineral carbonation in basaltic rock provides a permanent storage solution for the mitigation of anthropogenic CO2 emissions in the atmosphere. 3D X-ray micro-CT (XCT) image analysis is applied to a core sample from the main basaltic reservoir of the CarbFix site in Iceland, which obtained a connected porosity of 2.05-8.76%, a reactive surface area of 0.10-0.33 mm(-1) and a larger vertical permeability (2.07 x 10(-10) m(2)) compared to horizontal permeability (5.10 x 10(-11) m(2)). The calculations suggest a CO2 storage capacity of 0.33 Gigatonnes at the CarbFix pilot site. The XCT results were compared to those obtained from a hydromechanical test applied to the same sample, during which permeability, electrical resistivity and volumetric deformation were measured under realistic reservoir pressure conditions. It was found that permeability is highly stress sensitive, dropping by two orders of magnitude for a -0.02% volumetric deformation change, equivalent to a mean pore diameter reduction of 5 mu m. This pore contraction was insufficient to explain such a permeability reduction according to the XCT analysis, unless combined with the effects of clay swelling and secondary mineral pore clogging. The findings provide important benchmark data for the future upscaling and optimisation of CO2 storage in basalt formations.