石油与天然气地质 ›› 1985, Vol. 6 ›› Issue (1): 25-37.doi: 10.11743/ogg19850106

• 论文 • 上一篇    下一篇

特高蜡原油及其生油岩中可溶有机质的地球化学特征和成因分析

李晋超, 黄第藩, 张大江   

  1. 石油工业部石油勘探开发科学研究院
  • 收稿日期:1984-05-18 出版日期:1985-03-25 发布日期:2012-01-16

ON THE GEOCHEMISTRY AND ORIGIN OF SUPERHIGHWAX CRUDE OIL AND SOLUBLE ORGANIC MATTERS IN SOURCE ROCK

Li Jinchao, Huang Difan, Zhang Dajiang   

  1. Scientific Research Institute of Petroleum Exploration and Development, Beijing
  • Received:1984-05-18 Online:1985-03-25 Published:2012-01-16

摘要:

我国原油主要产自中、新生代陆相地层,除高成熟原油和生物降解原油外,几乎都以“高蜡低硫”为特征(含蜡量一般大于15%,南阳凹陷和大民屯凹陷部分油田可达50%左右),因而显著不同于典型海相原油(含蜡量一般小于3%)。Hedberg(1968),Tissot 和 Welte(1978),Corbett(1955),Thomas(1982),Abelson(1963)以及 Lijmbach(1975)等人曾从不同角度对高蜡原油进行过研究,认为高蜡原油的生成与非正常海相条件下陆源母质的聚集有关。但是,对高蜡原油及其生油岩的地球化学特征,迄今还没有人系统地进行过研究,特别是高蜡原油生油岩的熟化机制,还基本上没有进行过研究。

Abstract:

Geochemistry of superhigh-wax crude oils and soluble organic matters in source rocks of Nanyang and Damintun downwarps are studied.The content of wax and saturated hydrocarbon in oii is about 50%,80% respectively.From this,we could see that terrestrial lipoid has a great contribution to the wax-bearing petroleum,and the origin of the later might be related to the parent matters rich in phyto-wax.The similarity in distribution of normalalkanes from pyrolytic kerogen,from extraction of source rocks as well as from crude oil has proved that the super high-wax crude oil of Nanyang depressionare resulted from the sapropelic source rocks near the threshold depth of mature stage.Both Nanyang and Damintun downwarps were fault-confined lakes in Tertiary developed nearby with coniferous trees.This kind of forest had certainly con-tributed a great deal of materials rich in phytogenic-wax which give rise to the foundation for formation of superhigh-wax crude oil in these basins.The meta-akaline hydrological environment was favourable to the accumulation of terrestrial lipoid and phytogenic-wax in such a downwarp like Nanyang.