蜀南地区飞仙关组高精度层序地层研究HIGH-RESOLUTION SEQUENCE STRATIGRAPHY OF THE FEIXIANGUAN FORMATION IN SOUTHERN SICHUAN BASIN
廖明光,周素彦,罗冰,李凌,牟晓慧,夏吉文,周小刚,冯钰
摘要(Abstract)：
针对四川盆地下三叠统飞仙关组层序地层存在多种不同划分方案,以高精度层序地层学理论与方法为指导,以蜀南地区飞仙关组台地相碎屑岩和碳酸盐岩为研究对象,以野外露头剖面、岩芯、钻井、测井、地震等资料为基础,综合应用岩性突变面、沉积相转换面、沉积物空间堆积样式的变化、早期成岩变化、电测井曲线特征以及地震反射特征等标志,识别出不同级次的11个层序界面,据此将本区飞仙关组划分为2个三级层序(TSQ1和TSQ2)和10个四级层序,其中TSQ1可细分出6个四级层序,TSQ2可再分出4个四级层序,并将其与传统地层单位进行对比:三级层序TSQ1和TSQ2分别对应于飞一段+飞二段地层和飞三段+飞四段地层。通过层序地层对比和层序地层格架的建立,指出这些层序在全区均具有良好的可对比性和等时性,每个层序均具有快速海侵到缓慢海退的特点,均由海侵体系域和高位体系域构成,未发现低位体系域和凝缩段。层序与储层关系的研究表明,四级层序Ⅲ和Ⅷ是台内鲕滩这种有利储集相带的主要发育层位,所形成的滩相鲕粒灰岩储层与高位体系域的向上变浅序列和早期暴露及其所导致的大气淡水淋溶改造有关,平面上集中分布于中东部地区。
关键词(KeyWords)： 层序地层;层序界面;层序格架;储层;飞仙关组;三叠系;蜀南地区;四川
基金项目(Foundation): 四川省重点学科建设项目(SZD0414)资助
作者(Author): 廖明光,周素彦,罗冰,李凌,牟晓慧,夏吉文,周小刚,冯钰
DOI: 10.19839/j.cnki.dcxzz.2010.04.003
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