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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。
The characteristics of source rock and source of oil in Damintun Sag are compared, and the source, genesis and distribution of high wax oil are analyzed. The results show that there are two sets of source rocks with significant differences in organic matter types and abundances in the Damintun depression, namely “oil shale” and thick mudstone. The high oil in Damintun sag comes from “oil shale” while the normal oil comes from dark mudstone. The high abundance of organic matter provides the parent material for the formation of high waxy oil in the Damintun depression. The organic matter undergoes intensive microbial transformation to form high waxy oil. The low degree of thermal evolution is an important condition for high waxy oil generation and preservation. In the vertical direction, the high waxy oil in Damintun Depression is mainly distributed in the buried hill, the fourth sand and the lower part of the Third Sand. In the plane, it is mainly distributed in the buried hills of Dongshengpu, the buried hills of Jing’anpu and the vast areas of Jingbei, Distribution control.