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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。
The lack of markers in some underground formations in the western part of the northern margin of the northern Qaidam Basin makes it difficult to stratiform the stratigraphic correlation. At the same time, the conventional method of sedimentary cycles is seriously disturbed by human factors. Using the methods of spectrum analysis, wavelet transform and sliding averaging, the sedimentary cycle of the Paleogene-Neogene sedimentary cycle in the western margin of the northern Qaidam Basin is numerically analyzed and the sedimentary cycle of the sedimentary cycle is determined. Comparison and application of sedimentary environment analysis. The results show that the comprehensive application of the three methods for numerical analysis of sedimentary cycles can complement each other and confirm each other, which is an effective solution. In the absence of sign layers, the sedimentary cycle is an effective adjunct to small layer contrast. According to the result of sedimentary cycle, the change of grain size and frequency characteristics of sediment can be analyzed, which helps to improve understanding of sedimentary environment changes.