大港滩海埕北地区古近系发育沙三段至东一段地层,在这些地层中保存着丰富的介形类、腹足类、轮藻类、孢粉和藻类等生物化石.按照生物特征将沉积物分为A,B,C,D,E等5种生物相带,分别对应河流—三角洲平原和沼泽相、滨湖相、浅湖相、浅湖—半深湖相、深湖相的沉积环境.勘探资料表明,水生生物繁盛的滨湖、浅湖、半深湖环境是储集层发育地带,而高产油气流井、工业油气流井均分布于生物相地层的B,B-C,C,C-D,D相带中.%At Chengbei area of Dagang beach-sea region are developed Paleogene strata of Es3 to Ed1. The strata are abundant with biofossils, such as ostrcoda, gastropod, charophyta, sporopollen and alga. According to the fossils sediments in the area are divided into 5 (A, B C, D and E) biofacies which are correspondent to river-dalta plain and swamp, lake shore, shallow lake, shallow-bathysal lake and abysmal lake sedimentary facies respectively. Geological exploration in the area reveals that oil reserviors are developed under lake shore, shallow lake, shallow-bathysal lake environments where aquitic organism are flourished and barreler and industrial oil flow are generally distributed at biofacies B, B-C, C, C-D and D.
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