四川盆地北部下三叠统飞仙关组层序地层分析SEQUENCE STRATIGRAPHIC ANALYSIS OF THE LOWER TRIASSIC FEIXIANGUAN FORMATION IN NORTHERN SICHUAN BASIN
周琦,卓胜广,魏国齐,张林
摘要(Abstract)：
为了探讨礁滩储集岩的分布规律,以层序地层学理论与方法系统研究了四川盆地北部下三叠统飞仙关组地层。通过露头、岩芯、测井、地震数据综合分析,识别出两个三级层序及四个准层序组,确定蒸发台地、局限台地、开阔台地、台地边缘滩、斜坡和盆地相六类沉积类型。层序划分及层序界面的确定,依据陆上暴露和向上变浅两个方面的识别标志。暴露界面表现为泥岩表面干裂,淡水选择性溶蚀、白云化现象,白云岩、石膏,伽玛曲线高值。向上变浅层序有向上变厚、变粗序列,向上变细、变泥、变红序列,向上γ值变低序列。对比发现高水位体系域后期发育台地边缘鲕滩和台地内鲕滩。广泛白云岩化作用的台地边缘鲕滩相,具有很好的孔渗性,成为最有利的储集层。对指导进一步的勘探与开发具有重要意义。
关键词(KeyWords)： 储集层;层序地层;飞仙关组;三叠系;四川盆地
基金项目(Foundation): 国家“十五”科技攻关项目(No.2001BA606A04);; 中油股份公司资助项目成果
作者(Author): 周琦,卓胜广,魏国齐,张林
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