渤海湾盆地霸县凹陷输导体系与新近系油气运聚特征

PETROLEUM MIGRATION SYSTEM AND NEOGENE PETROLEUM ACCUMULATION FEATURES IN THE BAXIAN SAG,BOHAI BAY BASIN

渤海湾盆地霸县凹陷新近系油气藏主要分布在文安斜坡带的馆陶组地层中,油藏类型为受断层控制的断鼻或断块油藏,油藏的分布受有效输导体系控制明显。该文从油气显示特征及有效通道空间、流体性质、含氮化合物等方面研究入手,分析了文安斜坡区油气有效输导体系及油气运聚的特征、规律,明确了新近系油气的成藏模式。研究表明,研究区的输导体系主要由砂体、断层、不整合等要素组成,油气主要来自霸县洼槽沙一下亚段烃源岩,油气沿沙一上亚段、东营组和馆陶组的砂体、断层和不整合组成的通道运移,随运移距离的不断增加,运移层位逐渐变新,最终在文安斜坡带的新近系地层中成藏。

Neogene reservoirs are mainly distributed in Guantao Formation of Wen＇an slope, the Baxian Sag of the Bohai Bay Basin. Reservoir types are fault nose reservoirs and fault block reservoirs controlled by fault. The distribution of reservoir is clearly subjected to effective migration system. By studing oil and gas shows, effective pore space, fluid properties and nitrogen compounds, effective migration system arid petroleum accumulation features in Wen＇an slop area are analyzed. And accumulation models of Neocene reservoirs are established. Studies have shown, the passage system in the study area is made up of sand bodies, faults and unconformities. Oil and gas is mainly from source rocks in Es1 subsection, then it migrates through sand bodies of upper ESl subsection, Dongying Formation and Guantao Formation, faults and unconformities. With the increasing migration distance, migration horizons are getting newer, in the end it gathered in Neogene strata of the Wen＇an slope.