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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Signal analysis of cyclicity in Maastrichtian pelagic chalks from the Danish North Sea
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Signal analysis of cyclicity in Maastrichtian pelagic chalks from the Danish North Sea

机译：丹麦北海马斯特里赫特中白垩统周期性的信号分析

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摘要

Low field bulk magnetic susceptibility has been determined on Maastrichtian chalk samples from a drill core from the Dan Field in the Danish North Sea. Fast Fourier Transformations (FFT) have been used to detect possible cycles in the magnetic susceptibility data. Power spectra from the complete section and from sub-sections of the magnetic susceptibility reveal two cyclicities of ca. 0.4 cycles/m and ca. 1.7 cycles/m, which are present on a 90% confidence level. Signal analysis of natural gamma-ray wire-line log data supports these findings. Sedimentation rate estimates place the cycles in the Milankovitch frequency band. Artificial time series are used to study the applicability of the FFT to identifying cyclicity in chalks. Expected geological distortions (e.g., hiati and sedimentation rate variations) are introduced into the time series to investigate the response of the frequency spectra. Different methods of handling missing data intervals are also examined.
机译：在来自丹麦北海丹油田的钻芯上的马斯特里赫特白垩样品上确定了低磁场大磁化率。快速傅立叶变换（FFT）已用于检测磁化率数据中的可能周期。来自磁化率完整部分和子部分的功率谱显示出两个循环。 0.4个周期/米和1.7个周期/米，置信水平为90％。天然伽马射线测井数据的信号分析支持了这些发现。沉积率估算值将周期置于米兰科维奇频带中。人工时间序列用于研究FFT在识别粉笔周期中的适用性。将预期的地质畸变（例如高潮和沉积速率变化）引入到时间序列中，以研究频​​谱的响应。还研究了处理丢失数据间隔的不同方法。

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