松辽盆地朝阳沟阶地扶余-杨大城子油层油源分析与油气运移模式

基于生物标志化合物参数，系统对比分析了朝阳沟阶地扶余-杨大城子油层原油与三肇凹陷及朝阳沟阶地青山口组-段源岩的关系，表明朝阳沟阶地扶余油层有两个主要油源，即三肇凹陷青-段源岩与朝阳沟本地区青-段源岩，且两者对扶余油层的贡献量可能基本相同.朝阳沟地区杨大城子油层原油与三肇凹陷青-段源岩有密切的亲缘关系，与朝阳沟青-段源岩亲缘关系不明显.这与朝阳沟阶地源岩超压值相对较小、导致油气下排距离浅、进入杨大城子油层的油气量较小相符.在油源对比的基础上，结合断裂和砂体分布等各种地质条件，将朝阳沟阶地油气运移模式分为远源长距离侧向运移和近源短距离侧向运移两种类型.

Source rocks and hydrocarbon migration models of Fuyu-Yangdachengzi oil layer in the Chaoyanggou Terrace, Songliao Basin

By correlation of biomark parameters, the paper systematically analysed and correlated relationship of the crude oil of Fuyu-Yangdachengzi oiI Layer in the Chaoyanggou Terrace and the mudstone source rocks of Member 1, Qingshangkou Formation in the Sanzhao Sag.The results indicated that the crude oil of Fuyu oil layer in the Chaoyanggou Terrace had two source rocks,namely, the mudstone source rocks of Member 1, Qingshangkou Formation in the Sanzhao Sag and in the Chaoyanggou Terrace, and the contribution of the both to Fuyu oil layer might be nearly equal.The crude oil of Yangdachengzi oil layer in the Chaoyanggou Terrace had close relationship to the mudstone source rocks of Member 1 Qingshangkou Formation in the Sanzhao Sag, but might not have obvious relation with the mudstone source rocks of Member I, Qingshangkou Formation in the Chaoyanggou Terrace.These were coincidence with the lower over-pressure of mudstone source rocks of Member 1, Qingshangkou Formation in the Chaoyanggou Terrace, which resulted in the thickness of oil-gas downward discharge being shallow,and in the quantity of oil into Yangdachengzi oil layer being relatively smaller.Based on oil-source correlations, combination with geologic conditions of fault and distribution of sandbodies, the migration pattern in the Chaoyanggou Terrace could be divided into two modes:far source and far distance lateral migration, and near source and short distance lateral migration.