东营凹陷胜坨地区油气运移方向研究

Hydrocarbon migration direction in Shengtuo region of Dongying depression.

对胜坨地区沙四段上亚段和沙三段下亚段烃源岩、原油和大量油砂样品进行了饱和烃色谱、色谱-质谱等有机地球化学分析以及精细的油源对比,表明该区存在三种不同成因类型的原油分别来源于不同烃源岩。在此基础上,对研究区区域构造条件和有利的油气运移通道进行了分析。根据"地质色层"原理,分析了原油粘度、C15+正构烷烃相对含量、甾烷和萜烷分子等地球化学指标的变化规律,同时结合构造应力场分析,判断了区域性油气二次运移的方向和趋势:胜坨地区沙四段、沙三段原油以利津、民丰洼陷和胜坨地区北侧烃源岩为中心呈发散状运移。

Organic geochemistry analysis of saturated hydrocarbon chromatography and chromatography - mass spectro-graphy, and detailed oil-source correlation were made in source rocks, crude oil, and oil sand samples from upper Es4 and lower Es3 in Shengtuo region. It presented that three types of crude oil with different origins were generated from different source rocks. Then the favorable tectonic conditions and hydrocarbon migration paths were analyzed in this area. The variations of crude oil viscosity, C15+ normal alkane relative contents , geochemistry indexes of sterane and terpane mol-ecules have been analyzed according to the principle of geochromatography. Combined with tectonics stress field analysis, the secondary hydrocarbon migration direction and trend were judged macroscopically. Migration of Es3 and Es4 crude oil in Shengtuo region was divergent taking the source rocks of Lijin sag, Minfeng sag and the north of Shengtuo region as center.