致密油成藏主控因素对比及意义——以鄂尔多斯盆地长7段与松辽盆地扶余油层为例

致密油属于非常规油气领域，致密油的勘探开发是油田增储上产的关键因素。以鄂尔多斯盆地长7段致密油和松辽盆地扶余油层为代表的致密油研究取得了一系列的成果。从地质背景、烃源岩特征、储集空间、成藏动力等方面，将鄂尔多斯盆地长7段与松辽盆地扶余油层致密油的成藏机理和富集规律进行系统对比。结果显示，两者在烃源岩条件、储集空间、成藏动力等方面具有很大的相似性，但在成藏模式上存在一定差异：长7段烃源岩与储层是互层共生关系，属于源内成藏；而扶余油层的烃源岩位于储层之上，属于典型的上生下储，源下聚集。两者都具备致密油成藏的地质条件，可以形成具有工业价值的致密油藏，是我国非常规油气勘探领域的有利区带。

Comparison in accumulation controlling factors and its significance-A case from Chang 7 Member of Yanchang Formation in Ordos basin and Fuyu Reservoir in Songliao basin

The tight oil,unconventional oil and gas,the exploration and development of tight oil is a main fac-tor for improving oilfield output.A series of research is achieved on Chang 7 Member of Yanchang Formation in Ordos basin and the Fuyu Reservoir in Songliao basin.Based on geological background,source rock features, reservoir space and reservoir-forming dynamics,the study compared the mechanism of petroleum accumulation and the law of enrichment of the tight oil in Chang 7 Member of Yanchang Formation in Ordos basin and the Fuyu Reservoir in Songliao basin.The results show that they are quite similar in source rock features,reservoir space and reservoir-forming dynamics.But they are different in accumulation mode.The source rock and reser-voir in Chang 7 Member are interbedded symbiosis,belong to in-source reservoir-forming mechanism.Howev-er,the source rock is above the reservoir in Fuyu Reservoir,it belongs to injection migration,under-source reservoir-forming mechanism.They all have the geological conditions of tight oil accumulation and can form tight oil reservoir of commercial value.They are favorable zones in the field of unconventional oil and gas explo-ration in China.