罗冰,张玺华,陈延贵,袁东勋,王向东,史宇坤,马鑫怡,王文琦,侯章帅,陈吉涛,沈树忠

• 1:中国石油西南油气田公司勘探开发研究院
• 2:中国矿业大学资源与地球科学学院
• 3:南京大学地球科学与工程学院
• 4:关键地球物质循环前沿科学中心

摘要(Abstract)：

四川盆地的二叠系是油气勘探的重要目的层,有必要对盆地内的二叠系开展更加精细的划分和对比研究。四川盆地南缘的二叠系缺乏详细的生物地层和年代地层研究,本文选取最具代表性的四川古蔺三道水剖面,开展岩石地层和生物地层研究。剖面下部199 m的地层主要为中层至厚层状的灰岩和泥质灰岩,归为栖霞组,可见多层以炉渣状灰岩为特征的古风化壳,反映了浅水碳酸盐台地沉积环境并伴随多次暴露,主要产?类化石及少量牙形类化石。?类可识别出下部的Nankinella顶峰带和上部的Pseudodoliolinaoliviformis-Chusenellachoshiensis组合带,而牙形类归为Pseudosweetognathus带,指示时代为早二叠世空谷期。剖面上部,即199～296m的地层,主要为薄层至中层状微晶灰岩,归为茅口组,含硅质结核和硅质条带,反映了较深水的沉积环境,未见?类化石,牙形类可归为3个化石带,从下到上为Jinogondolella sp. 1带、J. postserrata带和J. shannoni带,指示时代为中二叠世。

关键词(KeyWords)： 四川盆地南缘;二叠系;?类;牙形类;古蔺三道水剖面

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 罗冰,张玺华,陈延贵,袁东勋,王向东,史宇坤,马鑫怡,王文琦,侯章帅,陈吉涛,沈树忠

DOI: 10.19839/j.cnki.dcxzz.2024.0020

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