束鹿凹陷南部下第三系的地层划分及古生态特征

本文根据六口钻井中的介形虫、轮藻及腹足类化石,结合岩性特征及区域资料,对束鹿凹陷南部下第三系重新进行划分和对比。论证了凹陷南部缺失沙河街组二段,沙一段与沙三段之间为假整合接触。确证本区的主要储油层为沙河街组三段。同时还根据微体古生物群的古生态特征、化石组合、分异度等,对本区沉积环境进行了探讨。

SUBDIVISION AND PALEOECOLOGY OF THE EARLY TERTIARY IN THE SOUTHERN PART OF SHULU DEPRESSION, HEBEI, CHINA

Early Tertiary samples from five wells in the Shulu Depression were studied. Ostracodes, gastropod and charophyte fossils were identified and compared with those from equivalent strata in adjacent areas. In addition, a large quantity of paleoecological data has been collected.The previously assigned member-2 of the Shahejie Formation has been shifted to member-3 of the same formation. The Camarocypris elliptica assemblage appears to be absent in the studied area, suggesting a disconformable contact between the member 1 and member 3. The paleoecology of ostracodes, charophytes, fish teeth and plants from the core samples has also been studied and the sedimentary environment for the corres ponding strata is discussed. This provides some valuable imformation for the predication of favourable facies zones.