京津霸地区始新世晚期至渐新世早期的生物群及其沉积环境

廊坊一固安凹陷、大厂凹陷及霸县二台阶,面积约3500平方公里(图1)。下第三系沙河街组三段、四段地层厚达5000米以上,是本区油气的生储层。开展古生态和沉积环境的研究,为本区的岩相模式和沉积体系、预测有利含油相带的研究提供基础。

BIOTA AND DEPOSITIONAL ENVIRONMENT IN BEIJIN- GTIANJIN-BAXIAN AREA DURING LATE EOCENE AND EARLY OLIGOCENE

The present paper deals with the paleoecology using the fossils of ostraco-da,algae,pelecypoda and fishes from more than dozen cores in Beijing-Tianjin-Baaian area.according to the eculogical characteristcs and geochemical norms,the late IJocene and early Oligocene sediments are divided into the"ecological facies groups"and the "ecologicalsequence groups",and the depositional environ- went in this area are reconstructed.