摘要
首次报道了周口拗陷东部钻井剖面中具有中新世孢粉组合,从其特征中可分为上下二个组合,与其他地区对比可定为早期及中晚期,在此基础上对植被群生长环境进行研究,论述了此段地层沉积时代的古气候及古环境。
It is the first time to report that the sporopollen assemblages of the Guantao Formation have been discovered in the log section of the Eastern Zhoukou Depression. The assemblages can be divided into two groups. The lower group is in age of early Miocene depending on the correlation to the adjacent areas while the characteristics of the upper group are similar to those of the Shanwang Formation in Shandong provinc and the Taidao type (mid -Miocene) in Japan, and more similar to those of the late Neigene sporopollen assemblage (in age of mid -late Miocene) in the North Jiangsu-South Yellow Sea areas. It is proposed that the assemblage in age of early stage belongs to north subtropical type while that in age of mid -late stages are transformed from warm to cool zones based on the characteristics of their vertical distributions.
出处
《石油实验地质》
CAS
CSCD
北大核心
1993年第1期108-114,共7页
Petroleum Geology & Experiment
