The main purpose of this study is to evaluate the feasibility of geologic CO₂ sequestration in terms of CO₂‐brine‐rock interactions in Ramin oil field, Iran. Static experiments were conducted with carbonate rocks at 70°C and atmospheric pressure for 14, 30, and 60 days. CO₂‐brine‐rock interactions were inferred from the evaluation of Ca²⁺, Mg²⁺, $\mathrm{C}{\mathrm{l}}^{-}$, and ${\mathrm{SO}}_4^{2-}$ concentrations and a thorough characterization of the carbonate rocks before and after treatment. Scanning electron microscopy (SEM) micrographs revealed the formation of dissolution pits and the growth of new structures. Energy dispersive X‐ray spectroscopy (EDS) and X‐ray diffraction (XRD) indicated these minerals to be calcite. Porosity of the carbonate rocks increased from an initial value of 4.72% to the maximum value of 11.83%. Then, it decreased to a value of 5.48% until the end of the experiments, that is, 60 days. Chemical analysis of brine suggested the precipitation and dissolution of calcium sulfate. In addition, dolomite dissolution and halite precipitation/dissolution were inferred. Calcite precipitation and porosity reduction suggested that CO₂ can be stored via mineral entrapment in the Ramin oil field, which is desired from the perspective of CO₂ geologic sequestration. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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伊朗一个油藏中CO2-岩-岩相互作用与CO2固存关系的实验研究

这项研究的主要目的是根据伊朗拉明油田的CO _2-盐岩-岩石相互作用，评估地质CO ₂固存的可行性。用碳酸盐岩石在70°C和大气压下进行了14、30和60天的静态实验。CO ₂ -brine岩石相互作用从Ca的评价推断²⁺，镁²⁺，$\mathrm{C}{\mathrm{升}}^{-}$， 和 ${\mathrm{所以}}_4^{2-}$浓度和碳酸盐岩处理前后的全面特征。扫描电子显微镜（SEM）显微照片揭示了溶蚀坑的形成和新结构的生长。能量色散X射线光谱（EDS）和X射线衍射（XRD）表明这些矿物为方解石。碳酸盐岩的孔隙度从初始值4.72％增加到最大值11.83％。然后，它降低到5.48％的值，直到实验结束，即60天。盐水的化学分析表明硫酸钙的沉淀和溶解。另外，推断白云石溶解和盐岩沉淀/溶解。方解石沉淀和孔隙度降低表明CO ₂可以通过拉明油田的矿物截留来储存二氧化碳，这从CO ₂地质隔离的角度来看是理想的。©2020年化学工业协会和John Wiley＆Sons，Ltd.