南盘江盆地二叠系高频沉积旋回的测井响应及海平面变化趋势  

High-frequency carbonate depositional cycles and its response to the gamma ray well logging data and sea-level change in Permian Nanpanjiang Basin

作　　者：龚大兴[1] 伊海生[1,2] 吴驰华[1] 唐云凤[1] 

机构地区：[1]成都理工大学沉积地质研究院,成都610059 [2]"油气藏地质及开发工程"国家重点实验室,成都610059

出　　处：《地球物理学进展》2011年第1期287-293,共7页Progress in Geophysics

基　　金："十一五"国家科技支撑计划项目(2006BAB01A12-5)资助

摘　　要：利用Fischer图解旋回分析技术识别碳酸盐岩沉积层序、反演长周期海平面变化趋势仍然以露头剖面为对象,人工识别其中的高频沉积旋回.在地下深部,由于旋回识别技术手段的欠缺还未见应用.本文以自然伽玛测井曲线为研究对象,将旋回分析技术首次引入深部地层,利用一阶差分法,在南盘江盆地二叠系测井曲线中共识别出431个高频沉积旋回,旋回厚度变化于0.25 m～4.25 m之间,旋回平均厚度为1.5 m;根据费希尔图解,认为早二叠世南盘江盆地至少经历了6次三级海平面升降变化,最大海泛期出现在栖霞组顶部茅口组底部沉积期.The method of Fischer plots, which is used to identify the carbonate sedimentary sequence, define longperiod sea-level change, is just used in the fields of outcrop or drill core. Similarly, the way to recognize highfrequency depositional cycles still relys on manpower. Now, by virtue of gamma ray well logging data, using the first difference method and Fischer plots, 431 high-frequency depositional cycles can be identified from the isolated carbonate platform in the area of Yang 1 well, in Permian Nanpanjiang basin. The thickness of these cycles change form 0.25 m to 4.25 m, the average value is 1.5m. And 6 times third-order sea-level fluctuations could be defined in the time of lower Premian in this area, the early of Maokou has been confirmed as the period of maximum flooding surface.

关 键 词：自然伽玛测井 高频沉积旋回 Fischer图解 海平面变化 二叠纪 南盘江盆地 

分 类 号：P631[天文地球—地质矿产勘探]