基于小波变换基准面恢复的砂砾岩期次划分与对比  

Division and correlation of glutenite sedimentary cycles based on base-level restoration using wavelet transform

作　　者：鲜本忠[1,2] 王永诗[3] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学资源与信息学院,北京102249 [3]中石化胜利油田地质科学研究院,山东东营257015

出　　处：《中国石油大学学报（自然科学版）》2008年第6期1-5,11,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技攻关项目(2003BA613A-02);山东省自然科学基金项目(Q2003E01)

摘　　要：针对砂砾岩地层古生物标志及标志层缺乏、地层划分对比困难的问题,初步探索出一种在地质背景和复合基准面原则约束下,利用测井曲线小波变换时频分析进行砂砾岩体沉积基准面恢复,进行其期次细分及井间对比的方法。以渤海湾盆地车镇凹陷北部陡坡带广泛发育的砂砾岩体为例,通过对三、四级基准面曲线的恢复,有效地实现了井间等时地层对比。研究表明,自然伽马或声波时差等测井信号小波变换后得到的多尺度小波系数周期性的振荡特征与各级层序旋回具有较好的对应关系,其高频成分的多级叠加可以较好地反映基准面变化特征,指导砂砾岩体期次的精细划分与对比。Strata division and correlation is difficult for glutenite lacking paleaobiological fossils and lithological marker horizons. A new method of division and correlation of glutenite＇s sedimentary cycles based on the base-level restoration using wavelet transform of logging data was preliminarily put forward according to geological setting and composite base-level princi- ple. Taking Chezhen depression in Bohai Bay Basin as an example, the 3rd and 4th base-level curves were restored and isochronous sequence stratigraphy correlation between different wells was realized. The results show that the periodical vibrancy of multi-scale wavelet coefficient resulted from wavelet transform of gamma ray log or interval transit time logging data respond to different scale sequence cycles, and the composite of high-frequency wavelet coefficients represent the base-level change characteristics and may be used to classify and correlate glutenite sedimentary cycles.

关 键 词：小波变换 测井信号 沉积基准面 层序地层 砂砾岩 车镇凹陷 

分 类 号：P539.2[天文地球—古生物学与地层学]