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陇东地区三叠系延长组沉积层序及充填响应特征
陈洪德 倪新锋
摘 要:陇东地区三叠系延长组是由顶、底两个区域性不整合或假整合界面组成的一个超长期旋回.在该构造层序形成发展的沉积演化旋回中,依据次一级的构造、气候、物源供给条件及湖平面升降等变化,可将上三叠统延长组分为区域上分布稳定的4个长期旋回.在此基础上,采用层序-盆地系统的动态成因分析方法,对陇东地区延长组进行了层序充填动力学研究,认为构造沉降的脉动性、气候的旋回性以及由此引起的沉积物供给的差异性控制了4个长期旋回的发育与演化.文中,进一步探讨了盆地演化过程中的层序充填动力学响应,指出湖盆演化的不同时期形成不同的沉积亚相组合、不同类型的沉积物以及不同的层序叠加样式.
关键词:沉积层序;湖盆演化;充填动力学;延长组;陇东地区;鄂尔多斯盆地
分类号:TE111.3 文献标识码:A
文章编号:0253-9985(2006)02-0143-09
Depositional sequence and filling response characteristics of Triassic Yanchang Formation In Longdong area
Chen Hongde Ni Xinfeng
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基金项目:国家重点基础研究发展计划(973)项目(2003CB214600)
作者简介:陈洪德(1956-),男,教授、博士生导师,层序地层学与含油气盆地分析
作者单位:陈洪德(成都理工大学,沉积地质研究院,"油气藏地质及开发工程"国家重点实验室,四川,成都,610059)
倪新锋(成都理工大学,沉积地质研究院,"油气藏地质及开发工程"国家重点实验室,四川,成都,610059)
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[1]谢渊.鄂尔多斯盆地富县探区上三叠统延长组层序地层与储层研究.成都理工大学博士论文,2002
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