摘要
用原油沥青质的地球化学研究结果分析油气藏形成条件,前提是油藏沥青质分子结构不因后期天然气或凝析油的再次充注而变化。在塔里木盆地轮南1井产出原油中加入不同体积的石油醚,模拟后期凝析油充注早期油藏的过程,测定不同沉淀条件下原油的沥青质沉淀量变化,并用瞬间热解 色谱 质谱的方法研究沥青质的分子结构。实验结果,原油沥青质随低分子烃类注入量的变化发生沉淀和再溶解,但沉淀出的沥青质分子结构相同。据此认为,低分子烃类加入原油体系不会改变沥青质的分子结构特征,沥青质热解产物能够反映原油的母质结构特征,可以根据该特征进行油/源、油/油对比或探讨混源油的母源类型。
The oil accumulated probably changed in chemical characters due to discharge of natural gas and condensate oil generated later. This process has been simulated by the adding of petroleum ether to crude oil instead of condensate oil, and the structure of asphaltenes from the Well Lunnan 1, Tarim Basin precipitated under various petroleum ether: crude oil ratio was investigated by flash pyrolysis-GC-MS. It is found that the chemical structure of asphaltene precipitated from oil have not been changed yet when petroleum ether was added continuously. The pyrolysate of asphaltenes can be used as the substituent of low molecular compounds for oil-source rock correlation and also for identification of oil source whatever the oil reservoir in superposition basin was discharged by secondary gas or condensate oil. The major contributors to these alkyl components might be non-saponifiable and aliphatic biopolymers in the cell walls of some algae species. The high abundance of 1,2,3,4-tetramethylbenzene in the pyrolysate of the asphalting may derived from photosynthetic green sulphur bacteria, which indicated the precursor of the oil from the Well Lunnan1 were formed under strongly reducing conditions.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第6期112-116,共5页
Petroleum Exploration and Development
基金
国家重点基础研究规划项目(G1999043308)
关键词
沥青质
瞬间热解-色谱-质谱
分子结构
凝析油充注
asphaltenes
flash pyrolysis-GC-MS
molecular structure
discharge of condensate oil
