Abstract Composition and solubility of asphaltenes from various oil fields have been compared. The structural group abundance in the asphaltenes have been determined according to Fourier transform infrared spectra, while the contents of sulfur, vanadium, nickel, vanadyl complexes, and free stable radicals has been evaluated using various methods. The solubility of asphaltenes in the n-heptane-toluene system has been evaluated by spectrophotometric kinetic analysis. It has been determined that the relative content of condensed aromatic structures and carbonyl groups, as well as sulfur-containing structures and vanadyl complexes affect to various extents the solubility of asphaltenes. Effect of the composition of asphaltenes on their solubility is different in the case of conventional and heavy oils.

中文翻译：

---

不同油田稠油沥青组成及溶解度对比分析

摘要 比较了不同油田沥青质的组成和溶解度。沥青质中的结构基团丰度已根据傅立叶变换红外光谱确定，而硫、钒、镍、氧钒配合物和自由基的含量已使用各种方法进行评估。沥青质在正庚烷-甲苯系统中的溶解度已通过分光光度动力学分析进行评估。已经确定稠合芳香结构和羰基的相对含量，以及含硫结构和氧钒基配合物在不同程度上影响沥青质的溶解度。在常规油和重油的情况下，沥青质的组成对其溶解度的影响是不同的。