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润湿性是控制油藏中流体的位置、流动和分布的主要因素 ,原油中的非烃化合物对油藏润湿性起着重要作用 ,但其中影响润湿性的主要因素至今尚未确定。作者对塔里木盆地的海相和陆相两类原油进行组分分离 ,利用人造岩心 ,按照Amott方法测定和分析了非烃化合物与沥青质的浓度对润湿指数的影响 ,并研究了原油中各组分的含量与润湿性的关系。实验表明 :①同种原油中非烃和沥青质对润湿性的影响情况相似 ,但不同原油中的非烃或沥青质对润湿性的影响有很大差异。据红外光谱分析 ,含强极性基团的非烃化合物比含弱极性基团的非烃化合物对润湿性的影响大。②油湿指数与原油中的烃类、非烃中的胺和吡咯氮等馏分的含量之间无确定关系 ,但与非烃中的吡啶氮馏分的含量呈正相关关系
Wettability is the main factor that controls the location, flow and distribution of fluids in a reservoir. Non-hydrocarbon compounds in crude oil play an important role in the reservoir wettability, but the main factors affecting the wettability have not been determined yet. The authors separated the marine and continental facies of the Tarim Basin by using artificial cores. The effects of non-hydrocarbon compounds and asphaltene concentrations on wetting index were determined and analyzed by Amott method. Relationship between component content and wettability. The experimental results show that: (1) The influence of non-hydrocarbon and asphaltene on the wettability of the same kind of crude oil is similar, but the influence of non-hydrocarbon or asphaltene in different crude oils on the wettability is quite different. According to infrared spectroscopy, non-hydrocarbon compounds with strong polar groups have a greater influence on wettability than non-hydrocarbon compounds with weak polar groups. ② There is no definite relationship between the oil wet index and the content of hydrocarbons, non-hydrocarbon amines and azole nitrogen in crude oil, but it is positively correlated with the content of pyridine nitrogen in non-hydrocarbon