孤北古2井太原组裸子化石的发现及地质意义

Discovery of gymnospermfossil in Taiyuan Formation and its geological meaning
for Well Gu2 in Gubei

吉双文 郭祥明

胜利石油管理局地质录井公司，山东 东营 257200

Mud Logging Company, Shengli PetroleumAdministration Bureau,
SINOPEC, Dongying 257200, China

通过对渤海湾盆地济阳坳陷沾化凹陷孤北古2井上古生界石炭系太原组“煤系地层”选样进行孢粉分析发现了裸子类化石。指出裸子类化石的发现将裸子类植物出现的时期从晚二叠世提前到晚石炭世，改变了植物的演化过程；修正了传统的地层划分方案，为沾化凹陷东部上古生界的划分提供了新的化石依据。

Through the analysis of the "coal measure strata"samples of Carboniferous Taiyuan Formation of Upper Paleozoic in Well
Gu2 of Gubei of Zhanhua subbasin, Jiyang Depression of Bohai Bay Basin, the gymnosperm fossil is discovered. The discovery
changed the evolution process of plants and proved that the appearing stage of gymnosperm fossil advanced from Late Permian to
Late Carboniferous. This revises the partition plan of traditional geologic strata and provides the new fossil bases for the dividing of
Upper Paleozoic strata in the eastern Zhanhua subbasin.