渤海湾盆地JZ20-2构造D探井古生物组合及其意义

THE PALAEONTOLOGICAL ASSEMBLAGES OF WELL D IN THE JZ20-2 STRUCTURE IN THE BOHAI BAY BASIN AND ITS SIGNIFICANCE

JZ20-2构造位于渤海湾盆地辽西低凸起。作者研究了D探井108件钻井岩屑样品,3件岩心样品,分析其中钙质超微化石。结合前人研究的该井其它门类的微体古生物资料,对D井的古生物组合特征进行了综合分析,并自下而上划分出侏罗系、沙河街组二段、沙河街组一段、东营组、馆陶组和明化镇组地层,并对沙河街组一段钙质页岩与生油的关系进行了初步讨论。

Calcareous nannofossils analysis has been carried out in 108 cuttings and 3 core samples from Well D in the JZ20-2 structure which is located in the Western Liaoning Lower Uplift in the Bohai Bay Basin. The paleontological assemblages in Well D have been established by integrating the calcareous nannofossils and other paleontological data. The stratigraphy in Well D can be subdivided into Jurassic, Shahejie Formation 2, Shabejie Formation 1, Dongying Formation, Guantao Formation and Minghuazhen Formation Irom the bottom up. The paper also discussed the source rock of the calcareous shale from the Upper Shahejie Formation.