重质油是指常规原油开采技术难于开采的具有较大的粘度和密度的原油。根据石油行业规划标准，原油的重轻质以原油的密度大小进行划分，可将其分为轻质原油、中质原油、重质原油和特稠原油，原油的密度取决于其化学组成，包括胶质、沥青质的含量，石油组分的分子量以及溶解气的含量。
Cellulose and hemicellulose were converted to light oil,however,lignin was mainly converted to heavy oil.
纤维素/半纤维素主要转化为轻质油,而木质素液化产物主要是重质油。
参考来源 - 木材正辛醇液化产物的红外光谱分析·2,447,543篇论文数据，部分数据来源于NoteExpress
脱除残渣中的重质油会降低残渣焦的气化反应性。
Removal of heavy oil from the liquefaction residue leads to the decrease of the gasification reactivity of residue char.
提高重质油深加工是炼油厂挖潜增效的重要途径。
Deep processing of heavy oil is an important route in refinery.
采用流化固体技术使低级重质油转化为轻质产品的热加工过程。
A thermal process utilizing the fluidized-solids technique for continuous conversion of heavy, low-grade oils into lighter products.
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