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温度和压力对于原油热裂解的影响已有大量研究,然而,油藏所处介质环境对于原油热裂解的影响研究长期以来并未得到足够重视.本文主要以原油中-高分子量正构烷烃(nC10+)为研究对象,重点考察实验过程中轻烃(nC8-)的生成行为,通过轻烃这个窗口,以热压模拟实验为手段,探视碳酸盐储层和碎屑岩储层环境碳酸盐矿物、黏土矿物、石英的含水体系对于原油热裂解的影响.研究结果表明,不同储层介质环境设定实验温度点热裂解后不同实验系统内nC10+残余量表现为:原油+伊利石+水>原油+蒙脱石+水>原油+水>原油+石英+水>原油+方解石+水.若以原油+水系统为基准,则伊利石和蒙脱石含水系统对原油热裂解有抑制作用,而石英、尤其方解石含水系统对原油热裂解具有促进作用.nC10+稳定碳同位素组成表现为:从原油+伊利石+水、原油+方解石+水、原油+蒙脱石+水、原油+石英+水到原油+水逐渐亏损13C.不同储层介质环境作用的差异性是导致nC10+含量与对应稳定碳同位素值之间无显著协变关系的重要原因.不同实验系统内nC8-生成量等也存在较为显著的差异显示储层介质环境对轻烃生成及其裂解生气和nC10+烃类C—C键断裂及异构化、环烷-芳构化反应均具有重要影响.本项研究对于原油热裂解化学动力学模型准确建立具有一定启示意义.
However, the research on the effect of medium environment in oil reservoir on pyrolysis of crude oil has not been paid enough attention for a long time.In this paper, the effects of medium-high molecular weight n-alkane (nC10 + ) As the research object, the formation behavior of light hydrocarbon (nC8-) during the experiment was investigated emphatically. Through the window of light hydrocarbon and the hot-pressure simulation experiment, the carbonate reservoir and clastic reservoir environmental carbonate Minerals, clay minerals and quartz on thermal cracking of crude oil.The results show that the residual amount of nC10 + in different experimental systems after thermal cracking at different experimental set-point temperatures is as follows: crude oil + illite + water> Crude oil + montmorillonite + water> crude oil + water> crude oil + quartz + water> crude oil + calcite + water If illite and montmorillonite aqueous systems are based on crude oil + water system, thermal cracking of crude oil is inhibited, Quartz, especially calcite aqueous system can promote pyrolysis of crude oil.nC10 + stable carbon isotope composition is as follows: crude oil + illite + water, crude oil + calcite + water, crude oil + montmorillonite + water, crude oil + quartz + water To the crude oil + water gradually loss 13C.Different reservoir environmental effects of the environment is the main reason that there is no significant covariant relationship between the nC10 + content and the corresponding stable carbon isotope values.Nc8- Significant differences show that the media environment plays an important role in the formation and cracking of light hydrocarbons and the cracking and isomerization of C-C bonds and the naphthalene-aromatization reaction of nC10 + hydrocarbons.In this study, Kinetic model accurately establish a certain enlightenment.