松辽盆地三肇地区扶杨油层油气成藏过程主控因素及成藏模式

从多元地质条件及其时空匹配关系的角度出发，对三肇地区扶杨油层油气成藏过程中的主控因素进行分析。结果表明:上覆青山口组一段源岩有效排烃范围、超压和T₂反射层油源断裂组合关系控制了油气垂向向下“倒灌”的运移范围、距离及层位；古构造背景、T₂断层与储层砂体配置关系控制着油气侧向运移的方向、通道和距离；基准面旋回、沉积微相类型与现今构造配置关系控制着油气的垂向聚集层位及平面分布规律。在此基础上，结合构造发育史、油源条件及沉积微相研究成果，对研究区扶杨油层油气成藏模式进行了总结，认为研究区扶杨油层主要存在4种成藏模式:源内--顶生下储式油气成藏模式、近源--短距离侧向运移--斜坡带断层遮挡油气成藏模式、源外--长距离侧向运移--继承性构造隆起带油气成藏模式、多源--多方式侧向运移油气成藏模式。

Controlling Factors and Accumulation Model of Hydrocarbon Accumulation of the Fuyang Oil Units in Sanzhao Region of the Songliao Basin

In order to further clarify the role of different geological conditions in hydrocarbon accumulation process, we researched the main controlling factors of hydrocarbon accumulation of Fuyang Formation in Sanzhao depression  based on the angle of diverse geological conditions and their relation in space-time. The result showed that the bound, distance and layer of hydrocarbon migrated downward were controlled by effective expulsion range of K₁qn¹ source rock, overpressure and T₂ fault assemblage. The direction, pathway and distance of the migrated oil were controlled by palaeostructure and the relationship between T₂ fault and reservoir. Vertical and lateral distribution of oil and gas were controlled by the factors of base level, sedimentary microfacies and recent tectonic. Based on those mentioned above coupled with structural history, oil sources conditions, sedimentary microfacies, four kinds of hydrocarbon accumulation models were summarized, they are, (a)inside source-upper source rock-lower reservoir model, (b)near source-short distance lateral migration-fault screened in slope zone model, (c)outside source-long distance lateral migration-inherited tectonic uplift zone model and (d)ulti-source-multi-lateral migration model.