大民屯凹陷油气系统研究

The petroleum system in the Damingtun Sag, Liaohe Oilfield

在精细油源对比的基础上 ,确定辽河坳陷大民屯凹陷存在油品性质不同的两大油气系统 ,即高蜡油系统和正常油系统。分析两大油气系统的四大要素和成藏动力学特征 ,认为二者除在烃源方面不同以外 ,在储集层、盖层、圈闭以及成藏特征方面既各具特色又有共同点 ,因而两大系统平面上交叉 ,纵向上部分叠合。大民屯凹陷油气系统成藏时间总体上早于辽河坳陷的东部凹陷和西部凹陷。今后大民屯凹陷应围绕油页岩进行高蜡油勘探。图 5表 3参

Based on the detail oil-source correlation, two petroleum systems of high waxy oil and normal oil are identified. Four elements and petroleum-accumulated dynamics for both systems are analyzed. There also exist similarities and dissimilarities in reservoir rock, cap rock, trap and reservoir forming feature except the source. Therefore, the two systems share something in common in vertical and plane distribution. The accumulated episode of the high waxy oil pool is a little earlier than that of normal one. The exploration of high waxy oil should focus on the distribution of oil shale.