Abstract Separation of heavy hydrocarbons from mineral surfaces is highly dependent on the oil composition and their host rock surface properties. Herein, the petroleum is divided into SARA fractions (saturates, aromatics, resins, asphaltenes) to investigate their desorption behaviors on different types of mineral surfaces (silica (SiO 2 ), kaolinite (Al 2 Si 2 O 5 (OH) 4 ) and calcium carbonate (CaCO 3 )). The Quartz Crystal Microbalance with Dissipation (QCM-D) tests show that the saturates and aromatics could desorb from the mineral surfaces spontaneously even in water, while no desorption was observed for the asphaltenes and resins. Although the above desorption could be enhanced by alkaline or surfactant solutions, great difference still appears to different oil fractions. Oil characterization shows that the heavy fractions (i.e., asphaltenes, resins) possess richer acid groups than those of light fractions, allowing the stronger affinity of heavy fractions to the mineral surfaces through polar and chemical interactions. Additionally, the heavy fractions dominate in determining the desorption properties of bitumen (the mixed fractions), and lead to more significant wettability alteration to the mineral surfaces. Furthermore, the oil fractions desorption is also found to be highly influenced by the mineral types. Compared with silica, kaolinite has stronger affinity to the heavy oil fractions, leading to smaller amount of desorption. While on the calcium carbonate surface, less than 11% of the coated oil fractions are observed to be desorbed. Surface characterizations summarize that, due to the difference in mineral composition, the affinity of minerals to oil components in aqueous solutions is given as: calcium carbonate (positively charged calcium ions) > kaolinite (containing –AlOH, –SiOH groups and heavy metal elements) > silica (–SiOH group). The above results reveal the differences among bitumen subfractions and mineral types, allowing potential insights to the development of enhanced oil recovery, such as aqueous-nonaqueous hybrid extraction process, solvent extraction, CO 2 -enhanced oil recovery, etc.

中文翻译：

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了解矿物表面油馏分的解吸

摘要 从矿物表面分离重烃高度依赖于油成分及其主岩表面特性。在此，将石油分为 SARA 馏分（饱和物、芳烃、树脂、沥青质）以研究它们在不同类型矿物表面（二氧化硅 (SiO 2 )、高岭石 (Al 2 Si 2 O 5 (OH) 4 ）和碳酸钙 (CaCO 3 ))。石英晶体耗散微量天平 (QCM-D) 测试表明，即使在水中，饱和物和芳烃也可以自发地从矿物表面解吸，而沥青质和树脂没有解吸。尽管碱性溶液或表面活性剂溶液可以增强上述解吸作用，但不同油分仍存在较大差异。石油表征表明，重馏分（即沥青质、树脂）具有比轻组分更丰富的酸基团，使重组分通过极性和化学相互作用对矿物表面具有更强的亲和力。此外，重馏分在决定沥青（混合馏分）的解吸特性方面占主导地位，并导致对矿物表面的润湿性更显着改变。此外，还发现油馏分的解吸受矿物类型的影响很大。与二氧化硅相比，高岭石对重油馏分的亲和力更强，解吸量更小。而在碳酸钙表面，观察到不到 11% 的包覆油馏分被解吸。表面特征总结说，由于矿物成分的差异，矿物对水溶液中油成分的亲和力为：碳酸钙（带正电荷的钙离子）> 高岭石（含有–AlOH、–SiOH 基团和重金属元素）> 二氧化硅（–SiOH 基团）。上述结果揭示了沥青亚馏分和矿物类型之间的差异，为提高石油采收率的发展提供了潜在的见解，例如水-非水混合萃取工艺、溶剂萃取、CO 2 增强采油等。