Application of Spectral Analysis to Identify Milankovitch Cycles and High-Frequency Sequences——Taking the Lower Ordovician Yingshan Formation of Mid-Tarim Basin as an Example
详细信息
- 责任者：Zhang Yunbo (Energy Institute ; China University of Geosciences ; Beijing 100083 ; China) ; Zhao Zongju
- 刊名：Journal of Jilin University
- 出版年：2011
- 卷期：41(2)
- 关键词：早奥陶世 ; Lower Ordovician ; 频谱分析 ; spectral analysis ; 测井曲线 ; logging curves ; 塔里木盆地 ; Tarim Basin
- 页码：p.400-410
- 图表：7 illus., 5 tables, 29 refs.
- 分类号：1200
- 出版序号：20120417
- issnNo：ISSN1671-5888
- isbnNo：CN22-1343/P
摘要
Based on the division in 3th-sequence about loggings and drillings and the study on high-frequency sequence about the outcrops in Bachu area, the authors identifies the high-frequency sequences with the characteristics of Milankovitch cycle, via the filtering, fast Fourier transform, wavelet analysis and tuning processing of the natural gamma spectrometry log ln (Th/K) curves of sequence OSQ2 of Lower Ordovician Yingshan Formation in Tazhong162 and 43 drillings, Tazhong area, Tarim Basin. The results show that the most obvious cycle is the obliquity, the period is 37.0 ka, which is the controlling factor of the development of 6th-meter-scale cycle that shallowing upward oriented.