The mechanisms of transformation of composition of heavy oils with different genotypes due to reaction with a hydrothermal fluid at 310°C temperature and 50 MPa pressure are investigated. The content of saturated hydrocarbons and linear alkanes decreases and of aromatic hydrocarbons and resins increases in A¹-type heavy oil when it is submitted to hydrothermal action. Upon hydrothermal action on B²-type heavy oil, the content of aromatic hydrocarbons decreases and of asphaltenes and saturated hydrocarbons increases in it. The peak of molecular mass distribution of n-alkanes shifts to the low-boiling region and the content of isoalkanes decreases. This indicates that the composition of heavy oils affects the dominance of certain reactions that occur in the thermal fluid.

研究了在310℃温度和50MPa压力下与热液反应导致不同基因型稠油组成转变的机理。^{A 1}型重油在水热作用下饱和烃和直链烷烃的含量降低，芳烃和树脂的含量增加。^{B 2}型稠油在水热作用下，芳烃含量降低，沥青质和饱和烃含量增加。正构烷烃的分子量分布峰向低沸区移动，异烷烃含量降低。这表明重油的组成会影响热流体中发生的某些反应的优势。