柴达木盆地北缘西段古近系--新近系沉积旋回数值解析  

Numerical Simulation of the Paleogene-Neogene Sedimentary Cycles in the West Segment,North Edge of Qaidam Basin

作　　者：刘瑞娟[1] 关平[1] 张永庶 简星[1] 王牧 冯帆[1] 

机构地区：[1]北京大学地球与空间科学学院 造山带与地壳演化教育部重点实验室,北京100871 [2]中国石油青海油田勘探开发研究院,甘肃敦煌736202

出　　处：《天然气地球科学》2012年第5期841-848,共8页Natural Gas Geoscience

基　　金：中国石油青海油田分公司“柴北缘冷湖四号至南八仙地区第三系沉积储层综合研究”项目(编号:QHKT/JL-003-004)资助

摘　　要：柴达木盆地北缘西段部分井下地层缺乏标志层给地层对比带来困难,同时传统的沉积旋回划分方法受人为因素干扰严重。综合运用频谱分析、小波变换和滑动平均3种方法对柴达木盆地北缘西段古近系—新近系沉积旋回进行数值解析,确定了沉积旋回的划分方案,并探讨了旋回划分在小层对比及沉积环境分析中的应用意义。结果表明:综合运用3种方法对沉积旋回进行数值解析,可以互为补充、相互印证,是行之有效的方案;在缺少标志层的情况下,沉积旋回划分是小层对比的有效辅助手段;根据沉积旋回划分结果,可以分析沉积物颗粒粒度的变化幅度和频率特征,有利于提高对沉积环境变迁的认识。Stratigraphic correlation is difficult in the west segment,north edge of Qaidam basin due to the lack of marker beds,and the traditional method of sedimentary cycle division is highly dependent on researchers.Researchers have tried single spectrum method to solve the above problems,but the results need to be improved.In this paper,we analyze and determine the division of Paleogene-Neogene sedimentary cycles in the west segment,north edge of Qaidam basin with mathematical method of combining frequency spectral analysis,moving average and wavelet analysis.Also we analyze research meaning of division about sedimentary cycles in layer division and analysis of sedimentary environment.Results show that it is complementary,interactive and effective to apply three methods synthetically for sedimentary cycle analyses,and division of sedimentary cycles is an effective assistant method to stratigraphic correlation.Partitioning results of sedimentary cycles are very useful to analyze amplitude of variation and frequency characteristic of sediment-size and deepen the understanding of the variance in sediment environment.

关 键 词：柴达木盆地 沉积旋回 频谱分析 小波变换 滑动平均 

分 类 号：TE121.3[石油与天然气工程—油气勘探]