陕北地区延长组标志层特征及形成机制CHARACTERISTICS AND DEPOSITION OF MARKER BEDS IN THE YANCHANG FORMATION OF THE NORTHERN SHAANXI
庞军刚,李文厚,陈全红
摘要(Abstract):
运用传统沉积学方法及层序地层学理论,在大量的钻井、野外露头资料基础上,系统分析陕北地区延长组地层划分标志层的岩性、电性特征,表明区域性油页岩标志层形成于延长组5个3级层序的最大湖泛期,具有"凝缩段"的特征,而凝灰岩标志层为火山喷发物质。这些标志层受沉积相横向变化的影响,主要分布在深湖亚相,部分分布在浅湖亚相。在不同沉积相形成的标志层的岩性特征、电性特征及平面分布均有一定的差异。地层划分对比过程中可用标志层控制、邻井对比并参考厚度原则的方法来确保划分的合理性。
关键词(KeyWords): 标志层;层序地层;形成机制;延长组;三叠系;陕北地区;陕西
基金项目(Foundation): 国家重点基金研究发展计划(973计划)项目(2003CB214602);; 长江学者和创新团队发展计划(IRT0559)联合资助
作者(Author): 庞军刚,李文厚,陈全红
DOI: 10.19839/j.cnki.dcxzz.2010.02.011
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