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颗石藻生烃的热模拟实验研究

宋一涛 李树碃   

  1. 胜利石油管理局地质科学研究院
  • 收稿日期:1995-06-20 修回日期:1995-06-20 出版日期:1995-12-20 发布日期:1995-12-20

EXPERIMENTAL STUDY ON SIMULATING HYDROCARBON-GENERATION OF COCCOLITHOPHORIDAES BY HEATING I. Generation Rate and Property of Hydrocarbons, Characteristic of Alkanes and Alkenes

Song yitao, Li Shuqing   

  1. Institute of Geosciences of Shengli Petroleum Administration
  • Received:1995-06-20 Revised:1995-06-20 Online:1995-12-20 Published:1995-12-20

摘要: 对同一种属但生长在不同环境中的两种颗石藻进行了加热模拟实验,探讨其成烃机理。实验发现,颗石菏含有丰富的石油烃类,加热生成的正构烷烃及类异戊二烯烷烃分布与含颗石烃源岩相似。对颗石藻生烃的热演化规律研究表明,氯仿沥青大量产生及烃类组成发生较大变化的实验温度区间为200-300℃,此阶段产物相当于镜质体反射率为R为0.35-0.55的含颗石藻烃的源岩,为低成熟原油生成阶段。本文还研究了颗石藻热模拟产物中植烯类化合物和C20-、C22-类胡萝卜烷等类异戊二烯烃随温度的变化,并检测出一种推测为C22-二甲基-烷基环己烷的化合物。

Abstract: Heating experiments to simulate hydrocarbon generation have been made for two kinds of Coccolithophoridaes which belong to the same species but live in different water-temperature environments, and the mechanism of hydrocarbon generation of Coccolithophoridaes has been discussed. It shows that there are many kinds of crude-oil, hydrocarbons in Coccoljthophoridaes, and the distribution of n-alkanes and isoprenoid alkanes generated by heating is similar to that of oil-source rocks containing Coccolithophoridaes, Experiments on temperature dependence of the, generation of Coccolithophoridaes indicate that the generation of a large quantity of chloroform and the essential change in hydrocarbon composition take place at 200- 300 C. The product of this stage corresponds to the oil-source rocks containing coccolithophoridaes with an Rc range of O.35~0.55%, as is in the case of low-maturity crude oil. This study a1so discusses the isoprenoid in the products of heating experiments on coccolithophoridaes, such as phytenes and C20-, C22- Camtane. A compound considered as C22- Dimethyl-Cyclahexane has been discovered in the experiments.