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根据油 岩对比分析 ,南堡凹陷存在两个已知的含油气系统 :(1)沙河街组含油气系统 ;(2 )东营组含油气系统。前一含油气系统在东营组沉积末时 ,沙河街组三段的烃源岩开始生烃 ,形成自生自储型原生油气藏 ,明化镇组沉积末 ,烃源岩二次生油 ,除形成原生油气藏外 ,还形成了上第三系次生油气藏 ;后一含油气系统在明化镇组沉积末时 ,东营组三段烃源岩在高柳断层以南开始生烃 ,形成东营组自生自储型油气藏及上第三系次生油气藏 ,而在高柳断层以北 ,烃源岩尚未开始生烃 ,不能形成含油气系统。因此 ,在南堡凹陷进行油气勘探时 ,高尚堡及柳赞地区 ,应以寻找沙河街组含油气系统的油气为主 ;北堡和老爷庙地区以寻找东营组含油气系统的油气为主。
According to the correlation analysis of oil and rock, there are two known petroleum systems in Nanpu Sag: (1) Shahejie Formation oil and gas system; (2) Dongying Formation petroleum system. When the former hydrocarbon-bearing system was deposited at the end of Dongying Formation, the source rocks of the third member of Shahejie Formation began to generate hydrocarbons to form a spontaneous self-reservoir type primary oil and gas reservoir. At the end of sedimentation of Minghuazhen Formation and secondary source oil of source rocks, Formation of the primary oil and gas reservoirs, but also formed on the Tertiary secondary oil and gas reservoirs; the latter oil and gas system at the end of Minghua Zhen sedimentation, the Dongying three source rocks in the south of Gaoliu fault hydrocarbon generation, the formation of Dongying Group are self-generating and self-reserving reservoirs and the Upper Tertiary secondary reservoirs. In the north of the Gaoliu Fault, source rocks have not started to generate hydrocarbons and can not form petroleum-bearing systems. Therefore, when oil and gas exploration is carried out in Nanpu sag, Gaoshangpu and Liuzan areas should be mainly oil and gas in search of Shahejie Formation oil and gas systems. Beibu and Laoyemiao areas should be mainly oil and gas in Dongying Formation petroleum system.