山东埕岛地区中生代地层特征分析

MESOZOIC STRATIGRAPHY IN THE CHENGDAO AREA OF SHANDONG PROVINCE

应用钻井、测井、古生物及地震资料,对埕岛地区中生代地层进行了综合研究。结果表明:中生代地层自下而上划分为坊子组、三台组、蒙阴组和西洼组,其中坊子组和三台组细分为上、下两段;受控于断层活动,除埕岛低凸起上缺失中生代地层外,其余地带均发育;坊子组、蒙阴组地层分布较为稳定,厚度变化较小,三台组、西洼组在横向分布不稳定,局部地层缺失;中生代地层接触关系复杂,除发育顶底两个不整合面以外,在三台组与坊子组、蒙阴组与三台组及西洼组与蒙阴组之间至少发育了2个地层不整合。

The integration of drilling,logging,biostratigraphic,and seismic data shows that Mesozoic strata in the Chengdao area can be divided into,in ascending order,the Fangzi,Santai,Mengyin and Xiwa formations.The Fangzi and Santai formations can each be subdivided into two members.Controlled by fault activities,Mesozoic strata are absent in some uplifts,but they are present in much of the Chengdo area.The Fangzi and Mengyin formations are regionally widespread,with consistent thickness across the Chengdao area.The Santai and Xiwa formations are variable and can be locally missing in some regions in the Chengdao area.Mesozoic stratigraphy in the Chengdao area is complex.In addition to the two unconformities at the top and bottom there are additional unconformities at the formation boundaries.