姬塬油田马家山地区长4+5_(1)亚段油藏特征及主控因素

Reservoir Characteristics and Main Controlling Factors of Chang 4+5_(1)Subsection in Majashan Area,Jiyuan Oilfield

为了加深对姬塬油田马家山地区长4+5_(1)亚段油藏特征及其主控因素的认识,从烃源岩构造、优势砂体及物性特征等方面对其作了对比分析。分析认为:研究区位于长7段烃源岩生烃中心,具有成藏的有利基础;叠置的优势砂体,促成了长7段烃源岩向长4+5_(1)亚段排出油气运移的主要通道;分流河道交汇处高渗砂体与近东西向排状鼻隆构造的匹配形成了石油聚集的有利场所;长4+5_(1)亚段油藏在多因素的共同控制下主要发育岩性油藏,其纵向上的砂体结构决定了石油富集于长4+5^(2)_(1)小层。

In order to deepen the understanding of reservoir characteristics and main controlling factors of Chang 4+5_(1)subsection in Majashan area of Jiyuan oilfield,a comparative analysis was made in terms of source rock structure,dominant sand body and physical properties.The analysis shows that the area is located in the hydrocarbon generation center of source rock of Chang 7 section,which has a favorable foundation for reservoir formation.The superimposed dominant sand body facilitated the main channel of hydrocarbon migration from source rock of Chang 7 section to Chang 4+5_(1)subsection.The matching between the high permeability sand body at the confluence of distributary channels and the near east-west row nose uplift structure forms a favorable place for oil accumulation.The Chang 4+5_(1)subsection reservoir is mainly lithologic under the control of many factors,and the longitudinal sand body structure determines that oil is enriched in the Chang 4+5^(2)_(1)small layer.