【摘要】 为了在青东凹陷古近纪找到油藏富集的有利区域,指导生产开发,对控制油藏分布和形成起关键性因素的烃源岩进行了综合评价。受郯庐断裂体系影响,构造复杂,沉积物源来自凹陷四周,沉积类型多。在对区域地质构造、地层发育特征、沉积相类型等进行分析的基础上,综合测井、地震以及地球化学资料,采用综合研究的手段对渤海湾盆地青东凹陷沙三、沙四段烃源岩厚度、有机质丰度、有机质类型、有机质成熟度进行了评价。结果表明:沙三下亚段和沙四上亚段暗色泥岩十分发育,在凹陷中部厚度较大,向凹陷四周暗色泥岩厚度逐渐变小;沙四上亚段有机质的丰度、成熟度都比沙三下亚段好,评级在好—优质;沙三下亚段和沙四上亚段干酪根类型以Ⅰ、Ⅱ₁型为主,含少量Ⅱ₂、Ⅲ型干酪根;沙三下亚段和沙四上亚段烃源岩都具有较强的生烃能力。更多还原

【Abstract】 In order to find favorable regional enrichment reservoir in Qingdong sag of Paleogene,guiding the production,hydrocarbon source rocks,which is the key factor of controlling reservoir formation and distribution,has been evaluated in comprehensive way.Affected by the Tanlu fault system,this area has complex structures,sedimentary type,sediment source of small and more.Based on the analysis of the regional geological structure,strata development characteristics and sedimentary facies types,combining geochemical data with logging and seismic,the research evaluated Qingdong Sag Es3 and Es4 source rock thickness,organic abundance,type of organic matter and organic maturity on Bohai Bay Basin.The results indicated that:the lower Section Es3 and the upper Section Es4 of dark mudstone develops lushly,the depression of the central of the dark mudstone develops larger thickness than others,Dark mudstone ’ s thickness in surrounding of the sunken becomes smaller.The abundance and mature of the organic matter of the upper Section Es4 is better than the lower Section Es3,in good quality rating.Both of the lower Section Es3 and the upper Section Es4 mainly bases on the type of Ⅰ and Ⅱ₁,and contains small amount of Ⅱ₂ and Ⅲ.As a whole,the source rock of the lower Section Es3 and the upper Section Es4 have a strong capacity of produce hydrocarbon.更多还原