Reservoir properties and reactivity of the Faroe Islands Basalt Group: Investigating the potential for CO2 storage in the North Atlantic Igneous Province
Reservoir properties and reactivity of the Faroe Islands Basalt Group: Investigating the potential for CO2 storage in the North Atlantic Igneous Province
复制标题
法罗群岛玄武岩群的储层特性和反应性：调查北大西洋火成岩省二氧化碳封存的潜力
DOI：
10.1016/j.ijggc.2023.103838
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发表时间：
2023
影响因子：
3.9
通讯作者：
Rosenqvist M
中科院分区：
文献类型：
--
作者：
Rosenqvist M
将CO2注入北大西洋火成岩省的火山序列中可能会通过碳酸盐矿化提供大规模的永久储存选择。为了调查这一潜力，对法罗群岛玄武岩组的储层特性和反应性进行了陆上研究。露头和钻孔样品显示，熔岩流结壳通常含有囊泡，由于热液循环，囊泡中充满了次生矿物，但也存在未矿化和高度多孔的层。对陆上钻孔样品的体积密度测量、微计算机断层扫描（µ-CT）图像分析和显微镜研究得出，火山序列中现今的孔隙度范围为0.5%至36.2%。未矿化的角砾熔岩流壳具有最大的估计孔隙度和模拟的绝对渗透率（高达10− 12 m2）。对矿化角砾流壳的µ-CT研究表明，堵塞前的初始孔隙率高达45%。岩石溶解动力学实验表明，玄武岩和火山岩沉积物的反应性取决于蚀变状态，蚀变玄武岩越多，反应性越低。然而，在堵塞之前存在活性、高孔隙度和高渗透率的流动结壳，表明在变化较小的海上层序中存在有希望的非常大的CO2储层。
Offshore injection of CO2into volcanic sequences of the North Atlantic Igneous Province may present a large-scale, permanent storage option through carbonate mineralization. To investigate this potential, onshore studies of reservoir properties and reactivity of the subaerially erupted Faroe Islands Basalt Group have been conducted. Outcrop and borehole samples reveal that the lava flow crusts commonly contain vesicles that have been filled with secondary minerals due to hydrothermal fluid circulation, however, unmineralized and highly porous layers do occur. Bulk density measurements, micro-computed tomography (µ-CT) image analysis, and microscope studies of samples from onshore boreholes give present-day porosities ranging from 0.5% to 36.2% in the volcanic sequences. The unmineralized brecciated lava flow crusts contain the largest estimated porosity and simulated absolute permeability (reaching up to 10−12m2). µ-CT studies of the mineralized, brecciated flow crusts indicate initial porosities reaching up to 45%, before clogging. Kinetic experiments of rock dissolution show that the reactivity of the basalt and volcaniclastic sediments depends on the alteration state with more altered basalt being less reactive. However, the presence of reactive, high porosity, and high permeability flow crusts prior to clogging indicate the existence of promising and very large CO2reservoirs in less altered offshore sequences.