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针对矛盾较多的沙三、沙四地层对比难点进行攻关,解决了沙组对应关系,选择在沙三下-沙四上取芯井12口进行古生物鉴定分析,依据古生物组合的面貌,参考渤海湾盆地其它油气区化石组合特征,分别从古生物演化、岩电性特征、凹陷演化及地震相位反射特征这四方面对界限划分进行论述。结论:文留、胡状集、马寨地区低阻红层之上的一套连续沉积的盐岩段顶界处的稳定泥页岩段,作为沙三段与沙四段的分界处。
According to the contradiction between Sands and Sesi stratigraphic strata, the paper deals with the contrast between the sandstones and strata, solves the corresponding relationship between the sandstones, and selects Paleocene- The characteristics of fossil assemblages in other oil and gas regions of the Bay Basin are discussed in terms of paleontological evolution, lithoelectrical characteristics, depression evolution and seismic phase reflection characteristics respectively. CONCLUSIONS: A set of stable shale sections at the top of a set of continuously deposited salt rocks above the low resistivity red beds in Wenliu, HuZhouji and Mazhai areas serve as the boundary of Sha3 and Sha4 sections.