Geological storage and mineralization of CO 2 in mafic/ultramafic reservoirs faces challenges including limited effective porosity, permeability, and rock reactivity; difficulties in using seawater for CO 2 capture; and uncontrolled carbonation. This study introduces a CO 2 capture, storage, and mineralization approach with the utilization of biobased biodegradable chelating agents and seawater. An acidic chelating agent solution is used to increase effective porosity and permeability through enhanced mineral dissolution. For instance, applying an acidic N , N -Bis(carboxymethyl)- L -glutamate solution to a porous basalt increased effective porosity by 16% and permeability by 26-fold in 120 hours. Subsequently, alkaline chelating agent–containing seawater improves CO 2 capture and storage by inhibiting mineralization, thus maintaining injectivity while providing ions for mineralization and further expanding storage space. Last, controlled mineralization is achieved by adjusting chelating agent biodegradation. Promising CO 2 storage and mineralization capacities two orders higher than current techniques, this approach reduces required reservoir volume while enhancing efficiency.

中文翻译：

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使用生物基可生物降解螯合剂和海水捕获、地质储存和矿化 CO 2


镁铁质/超镁铁质储层中 CO 2 的地质储存和矿化面临挑战，包括有效孔隙度、渗透性和岩石反应性有限;利用海水捕获 CO 2 的困难;和不受控制的碳化。本研究介绍了一种利用生物基可生物降解螯合剂和海水的 CO 2 捕获、储存和矿化方法。酸性螯合剂溶液用于通过增强矿物溶解来提高有效孔隙率和渗透性。例如，将酸性 N、N-双（羧甲基）-L-谷氨酸盐溶液涂在多孔玄武岩上，可在 120 小时内将有效孔隙率提高 16%，渗透率提高 26 倍。随后，含有碱性螯合剂的海水通过抑制矿化来改善 CO 2 的捕获和储存，从而在为矿化提供离子的同时保持注入性并进一步扩大储存空间。最后，通过调整螯合剂的生物降解来实现受控的矿化。这种方法的 CO 2 封存和矿化能力比目前的技术高出两个数量级，在提高效率的同时减少了所需的储层体积。