关键词: 稠油, 含氧化合物, 生物降解, 辽河盆地

Abstract: In this paper result is reported of a primary investigation of the types of nonhydrocarbon in the heavy oil of Liaohe Basin, Northeast China,based on the analytical data achieved with GC and GC-MS of ten samples from the Leng-43 district,Niu-Xin-Tuo district, Gao-Ⅰ district and Gao-Ⅲdistrict respectively. The results show that the hetero-fraction of the samples is dominated by oxygenated compounds,while the abundance of nitrogenous compounds and sulphureous compounds is minor. No phosphorous compound was detected. The acidic fraction constitutes the main proportion of the oxygenated compounds(>47%),among which straight-chain fatty acids account for more than 96%. The insignificant proportion of the oxygenated compounds, however,consists of a variety of organic compound classes including straight-chain alkanones and alcohols,triterpanoid ketones and acids,sterols,iso-and anteiso-fatty acids,phenols and aromatic carboxylic acids. Besides,four pairs of isomers with unknown structure were outstandingly observed in the neutral fractionⅠ as main constituents. Additionally, a lot of compounds remain unidentifiable. The distribution pattern of oxygenated compounds imply that the heavy oil of Liaohe Basin has suffered strong biodegradation and underground-water flush,and received input of aquatic organisms of evident amount.

Key words: heavy oil, oxygenated compounds, biodegradation, Liaohe Basin