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陆东凹陷油气藏烃类组成非均质性及其意义

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  • 长江大学地球化学研究中心,湖北 荆州434023
张敏(1962-),男,安徽肥东人,教授,主要从事有机地球化学和石油地质学研究.

收稿日期: 2003-09-04

  修回日期: 2003-09-25

  网络出版日期: 2003-12-20

基金资助

中国石油天然气集团公司中青年创新基金项目(编号:98-J05)资助.

HYDROCARBON COMPOSITIONAL HETEROGENEITIES OF PETROLEUMRESERVIOIRS IN LUDONG DEPRESSION AND ITS GEOLOGICAL SIGNIFICANCE

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  • [WT5"BX](Geochemistry Research Center of Yangtze University, Jingzhou 434023, China

Received date: 2003-09-04

  Revised date: 2003-09-25

  Online published: 2003-12-20

摘要

陆东凹陷原油和油砂抽提物中烃类的宏观组成存在着明显的非均质性。在高孔隙度(>15%)储层单元中,饱和烃的含量高,占总组成的含量均大于40%,而极性化合物则相对较低,一般不足40%;相反,在低孔隙度(<15%)储层单元中,饱和烃的含量明显降低,而极性化合物则显著增加。此外,陆东凹陷原油和油砂抽提物中烃类成熟度亦存在着非均质性:在高孔隙度储层中,原油和油砂烃类的成熟度参数高,而在低孔隙度储层中原油和油砂烃类的成熟度参数低。根据原油和油砂抽提物中烃类的宏观组成特征和成熟度参数的变化规律,提出了陆东凹陷油气聚集模式。

本文引用格式

张敏, 张春明, 冯 敏, 刘庆新 . 陆东凹陷油气藏烃类组成非均质性及其意义[J]. 天然气地球科学, 2003 , 14(6) : 488 -491 . DOI: 10.11764/j.issn.1672-1926.2003.06.488

Abstract

The bulk composition (proportion of saturated hydrocarbons, aromatic hydrocarbons and polar compounds) of crude oils and oilsands in Ludong depression is fairly heterogeneous throughout the field. In high-porosity sandstones(>15%), the proportion of  saturated hydrocarbons amounts to about 50% of the total extract, which is also similar to the well-head oils, where the low-porosity(<10%) sandstones contain only 30% saturated hydrocarbons. The  proportion of polar compounds reveals an opposite trend and changes from 30% to about 50% from the high- to the low-porosity areas. Likewise the mature parameters of crude oils and oilsands in Ludong depression reveal a wide range of variation. More mature residual oils in high-porosity versus low mature residual oils in low-porosity sandstones. The observed compositional variations between high and low porosity reservoirs in Ludong depression are most likely due to petroleum fluids derived from different stage of generation history in same source rocks.

参考文献

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