地质通报2018，Vol.37Issue(1)：16-25,10.
银额盆地西部蒙额地1井二叠纪叶肢介的发现及其意义
The discovery of Permian Estheria in the core of No.1 Meng' edi well,western Yingen-Ejin basin,and its significance
摘要
Abstract
In recent years, the oil and gas exploration in Yingen-Ejin basin keeps achieving significant findings and breakthroughs. However, stratigraphic division of drill holes and corresponding age of oil and gas reservoir remain much controversial. Some re-searchers hold that the reservoir would be Cretaceous layers,some opponents raise the idea of Permian.For the purpose of construct-ing stratigraphic succession in such a basin, No.1 Meng'edi well was drilled and cored in western Yingen-Ejin basin. Within this well,Estheria fossils were found in 930.5~958.0m section composed of gray to greyish green silty mudstone and mudstone layers,and in 1085.0~1095.5m section composed of dark gray mudstone layers,respectively.Therefore,Estheria fossils in the former well section were identified as Cyclotunguzites cf.gazimuri Novojilov,whereas those in latter section were identified as Hemicycloleaia ejinaqiensis Niu(sp.nov.)and Polygrapta neimengguensis Niu(sp.nov.).All of these Estheria fossils were assigned to the period of Permian.In addi-tion to the evidence of stratigraphic correlation between drilling wells,the age of oil and gas reservoir was judged as Permian layers. Besides, Estheria fossils contain great indicating meaning in paleobiogeography. Based on comparing the distribution of Permian Es-theria as well as analyzing the Carboniferous-Permian succession of Yingen-Ejin basin,the closing time of Paleo-Asian Ocean has been further constrained to Pre-Carboniferous.关键词
银额盆地/二叠纪/叶肢介/油气产层时代Key words
Yingen-Ejin basin/Permian/Estheria/oil and gas reservoir age分类
天文与地球科学引用本文复制引用
卢进才,牛绍武,魏建设,姜亭,王宝文,余龙,许海红..银额盆地西部蒙额地1井二叠纪叶肢介的发现及其意义[J].地质通报,2018,37(1):16-25,10.基金项目
中国地质调查局项目《银额盆地及邻区石炭—二叠系油气远景调查》(编号:121201112096)和《银额盆地及周缘油气基础地质调查》(编号:121201152201) （编号:121201112096）
