大民屯凹陷高蜡油成因及分布规律

对大民屯凹陷烃源岩特征和油源进行了对比,对高蜡油来源、成因和分布规律进行了分析。结果表明,大民屯凹陷发育两套有机质类型和丰度差别显著的烃源岩,即“油页岩”和厚层泥岩。大民屯凹陷高蜡油来源于“油页岩”,而正常油来源于暗色泥岩。高丰度的有机质为大民屯凹陷高蜡油的形成提供了母质条件,有机质经过强烈的微生物改造形成了高蜡油,较低的热演化程度是高蜡油生成和保存的重要条件。大民屯凹陷高蜡油纵向上主要分布在古潜山、沙四以及沙三下部;平面上主要分布在东胜堡潜山、静安堡潜山及静北广大地区,明显受“油页岩”的分布控制。

Origin and distribution of high-waxy oil in Damintun Sag

The characteristics of source rocks and oil sources in Damintun Sag of Liaohe Basin were correlated.The origin and distribution of high-waxy and high-pour oil in Damintun Sag were analyzed.There exists two sets of oil source rocks distinguished in organic matter type and abundance,including "oil shale" and dark shale.The high-waxy oil generated from the "oil shale",while normal oil generated from the dark shale.The origins of high-waxy oil in Damintun Sag include high abundance organic matter,strong microbe reformation and low thermal developing history.The high-waxy oil occurs in the buried-hill,Es4 and the bottom of Es3 vertically.In the plane,it mainly distributes in the Dongshengpu buried-hill,Jing'anpu buried hill and the north part of Jing'anpu under the control of "oil shale".