新疆石油地质

›› 2017, Vol. 38 ›› Issue (5): 1-1.doi: 10.7657/XJPG20170512

• 论文 •    

生物降解稠油中沥青质热模拟实验

李二庭1，陈俊1，于双2，周妮1，马万云1，王熠1，龙新满1   

  1. (1.中国石油 新疆油田分公司 实验检测研究院,新疆 克拉玛依 834000;2.中国科学院大学 广州地球化学研究所,广州 510640)
  • 出版日期:2019-01-01 发布日期:1905-07-17

Thermal Simulation Experiment on Asphaltene in Biodegraded Heavy Oil

LI Erting1, CHEN Jun1,YU Shuang2, ZHOU Ni1, MA Wanyun1, WANG Yi1, LONG Xinman1   

  1. (1.Research Institute of Experiment and Testing, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China; 2.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China)
  • Online:2019-01-01 Published:1905-07-17

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摘要： 对准噶尔盆地西北缘正常原油和严重生物降解稠油中沥青质在不同温度下热模拟产物的生物标志化合物进行了对比分析，结果表明，300℃是较为理想的热模拟温度，在这种条件下，稠油沥青质热模拟产物中生物标志化合物的组成分布与正常原油较为一致，其生物标志化合物组成完整，未遭受生物降解，可用于严重降解油的油源分析，主要表现为：Pr/nC17值和Ph/nC18值相对偏高（分别为0.66~0.71和1.01~1.21），Pr/Ph值相对较低（1.15~1.21），伽马蜡烷指数相对较高（0.30~0.41），反映母质沉积环境为弱还原—还原的半咸水—咸水环境；三环萜烷以“C20＞C21＞C23”模式分布，C23三环萜烷/（C30藿烷+C23三环萜烷）值为0.46~0.49；Ts和C29Ts相对含量极低，与典型风城组烃源岩的生物标志化合物分布特征基本一致。

Abstract: The paper analyzes and compares the biomarkers in the products from asphaltene thermal simulation at different temperatures in normal crude oil and heavy oil suffered from serious biodegradation in the northwestern margin of Junggar basin. The results show that relatively ideal temperature for the thermal simulation is 300℃, at which biomarker composition distribution of the products from the asphaltene thermal simulation of heavy oil is in accordance with that of normal crude oil. The biomarker in the simulation products of the heavy oil has complete compositions, indicating that it didn’t suffer from biodegradation and can be used to do oil source analysis for seriously biodegraded oil, which is featured with relatively high Pr/nC17 and Ph/nC18（0.66~0.71 and 1.01~1.21, respectively), relatively low Pr/Ph （1.15~1.21) and relatively high gammacerane index (0.30~0.41), indicating a weak reducing-reducing and brackish water-saline water depositional environment of organic parent materials; a C20＞C21＞C23 distribution pattern of tricyclic terpane and C23 tricyclic terpane/(C30 hopane + C23 tricyclic terpane) of 0.46~0.49; and extremely low content of Ts and C29Ts, showing that it is almost the same to the biomarker in the typical source rocks of Fengcheng formation

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