Blackman-Tukey频谱分析方法识别地层周期

Identification of stratigraphical cycles by Blackman-Tukey spectral analysis

为解释高分辨率地层层序,通过Blackman-Tukey频谱分析方法探测地层中存在的周期.对电成像测井数据进行预处理,提炼基质电导率曲线;研究Blackman-Tukey频谱分析识别地层周期的方法,借助古地磁测井和地磁极性时间尺度资料,将地层周期信号从深度域转换到时间域,并与地层年代建立联系.结果表明,用Blackman-Tukey频谱分析方法识别地层周期很好地吻合米兰克维奇周期,证明此方法的准确性,为利用电成像测井数据进行地层周期的识别及高分辨地层层序的划分提供方法和思路.

The purpose of this paper is to perform a spectral analysis method of Blackman-Tukey on high-resolution electrical borehole image logs data to investigate whether the cycles in the sediments to interpret the high-resolution formation sequence.Firstly,in order to perform a spectral analysis on FMI data,it has to extract background conductivity log from the borehole image.Then,research how to use the Blackman-Tukey method to identify the stratigraphical cycles.Finally,spectral analysis of the background conductivity data is made in the field case.The results show that the identified cycles in the sedimentary record match the Milankovitch cycles and prove the method is correctly.This paper provides a new approach and idea for identifying stratigraphic and interpreting high-resolution sequence stratigraphy.