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板桥地区位于天津市南郊区上古林与独流碱河之间,构造上属黄骅坳陷北大港构造带向东北倾没部分。以大张坨断裂为界,以北为板桥中、北断块,以南为板桥南断块(见图1)。板桥油气田到目前为止,计有五十六口井做过介形类化石的分析、鉴定工作,在现有的岩心资料基础上,本文着重对本区东营组与沙河街组的界线划分进行了探讨,并结合鱼类、腹足类、孢粉化石资料,提出了初步划分意见。为便于讨论,先将本区下第三系各组、段的地层及介形类化石组合加以介绍,在地层叙述方面,沿用现行地层划分方案,化石系采用《渤海沿岸地区早第三纪介形类》的命名。
Banqiao area is located in the southern suburb of Tianjin city between the ancient grove and the Alluvial River, structural belonged to the Huanghua Depression, North Dagang structural belt to the northeast dumping part. To Zhang Tituo fault as the boundary, north of Banqiao, North fault block, south of Banqiao South block (see Figure 1). So far, 56 wells have been analyzed and identified in the Itabashi oil and gas field. Based on the existing core data, this paper focuses on the division of the boundary between Dongying Formation and Shahejie Formation in this area Explore, combined with fish, gastropods, sporo-pollen fossil data, put forward the initial division of opinion. In order to facilitate the discussion, we first introduce the stratigraphic and ostracod assemblages in each group and segment of the Tertiary in this area. In stratigraphic narration, the existing stratigraphic division scheme is adopted. The fossil system uses the “Early Tertiary Plan of the Bohai Sea Coast Shape category ”name.