东濮凹陷原油、油砂抽提物与油气包裹体地球化学对比及其意义  

Geochemical comparison and implications of oils, core extracts and oil-bearing fluid inclusions in reservoirs of Dongpu Depression

作　　者：冯建辉[1] 谈玉明[1] 罗小平[2] 王伟栋[2] 潘长春[1] 盛国英[1] 傅家谟[1] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]中国石油化工股份有限公司中原油田分公司勘探开发科学研究院

出　　处：《地球化学》2003年第6期591-600,共10页Geochimica

基　　金：国家自然科学基金(40173022);中国石油化工股份有限公司中原油田分公司勘探开发研究院资助项目

摘　　要：通过对东濮凹陷桥口构造Q27井和Q55井原油、油砂抽提物和油气包裹体族组成和分子地球化学对比,可以发现:(1)油砂抽提物由于含蜡量高,非烃、沥青质含量低,其饱和烃、芳烃含量甚至比原油高,非烃、沥青质含量甚至比原油低;(2)Q27原油样与从同一井段内采取的油砂抽提物甾、萜烷分布特征存在着较为明显的差异,表明采油井段的原油地球化学组成是不均一的;(3)两口井的油气包裹体甾、萜烷分子指标,包括油源指标和成熟度指标,与油砂抽提物和原油也均有明显的差异,表明在油气注入过程中原油的油源和成熟度是不断变化的。尽管该地区的原油均来自沙三段,但在不同时间注入的原油可能来自不同“亚层”或“不同分布区域”的沙三段烃源岩。A detail study was undertaken to compare the gross compositions and molecular parameters obtained from the analyses of oils samples, core extracts and the associate oil bearing fluid inclusions in samples collected from Borehole Q27 and Q55 in Qiaokou area, Dongpu Depression. It is found that: (1) the contents of aliphatic and aromatic fractions in core extracts are similar to, or even higher than those in oils due to the high content of waxes; (2) the distribution patterns of terpanes and steranes between the oil and core extracts, collected from the same interval in Borehole Q27, are significantly different, which demonstrates the compositional heterogeneity of hydrocarbons in the reservoir interval; and (3) the molecular parameters, both the facies and maturity indicators, among the oil bearing fluid inclusion, corresponding core extracts and oil samples also vary considerably, which demonstrates subtle changes of oil sources and maturities during the oil filling process. Although all oils found in this area are derived from the source rock of ES3 age, the oils charging the reservoirs at the different stage could be generated from different layers of this source rock, or this rock in different source kitchen areas.

关 键 词：东濮凹陷 原油 油砂抽提物 油气包裹体 地球化学 油气注入史 

分 类 号：P593[天文地球—地球化学] P618.130.2[天文地球—地质学]