Dawsonite as a Temporary but Effective Sink for Geological Carbon Storage
Dawsonite as a Temporary but Effective Sink for Geological Carbon Storage
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DOI：
10.1016/j.ijggc.2022.103733
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发表时间：
2022-09
影响因子：
3.9
通讯作者：
Peng Lu;Guanru Zhang;Yi Huang;J. Apps;Chengmo Zhu
中科院分区：
文献类型：
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作者：
Peng Lu;Guanru Zhang;Yi Huang;J. Apps;Chengmo Zhu
使用片钠铝石矿物捕集作为碳捕获和储存（CCS）策略的可能性令人担忧。在这项研究中，我们使用了一个片钠铝石丰富（约10%）的CO2气藏在中国北方海拉尔盆地作为一个天然模拟的CO2存储网站，沿着与数值模拟，以证明大量的片钠铝石可以产生在砂岩地层，提供足够的富钠长石和CO2气体。虽然沉淀的片钠铝石只能在水动力学封闭系统中长期保存在高CO2逸度和log（（Na+）/（H+））活动的溶液中，短期捕获的CO2片钠铝石（约10 kyr）是可能的，并降低CO2压力，这减轻了CO2泄漏到地面或覆盖饮用水含水层的风险。片钠铝石在几千年后的再溶解促进了气相CO2随时间的逐渐消散。考虑到含有可提供大量溶解钠的矿物质或地层水的水库或含盐含水层，将大大增加全球潜在CCS场址的数量。此外，交替的水和气体注入方案可以提高片钠铝石在富钠含水层中的沉淀。今后版本的碳储存图集除了考虑短期运行的体积因素外，还应在选址时考虑含水层的地球化学，以确保长期碳储存。
The possibility of using dawsonite mineral trapping as a carbon capture and storage (CCS) strategy intrigues many. In this study, we used a dawsonite-rich (∼10%) CO2gas reservoir in the Hailar basin in northern China as a natural analogue of a CO2storage site, along with numerical modeling, to demonstrate that a large amount of dawsonite can be generated in sandstone formations, provided sufficient Na-rich feldspar and CO2gas are available. While precipitated dawsonite can be preserved only in a hydrodynamically-closed system in the long term under high CO2fugacity and log((Na+)/(H+)) activities in solution, short-term trapping of CO2in dawsonite (on the order of 10 kyr) is possible and lowers CO2pressure, which mitigates the risk of CO2leakage to the ground surface or overlying drinking water aquifers. The re-dissolution of dawsonite after a few thousand years facilitates progressive dissipation of the gas phase CO2over time. Consideration of reservoirs or saline aquifers with minerals or formation water that can provide a high abundance of dissolved sodium, significantly increases the number of potential CCS sites globally. Furthermore, alternating water-and-gas injection regimens could enhance the precipitation of dawsonite in Na-rich aquifers. Future editions of the Carbon Storage Atlas should consider aquifer geochemistry in the site selection for secure long-term carbon storage in addition to the volumetric considerations for short-term operation.