THICKNESS VARIATION OF TIDAL COUPLETS AND ITS GEOLOGICAL SIGNIFICANCE
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摘要: 从统计珠江口盆地A井潮汐沉积的砂泥层偶厚度变化出发,采用平滑处理、傅里叶变换及小波分析等方法分析砂泥厚度变化的周期性。在此基础上,将层偶厚度、砂质纹层厚度以及泥质纹层厚度三者的周期性进行对比分析,定量探讨各周期的主控因素。研究表明,砂泥厚度变化并非仅与潮流周期相关,还与沉积相带变化和事件沉积密切相关。潮流周期呈正弦波动,频率较高,对层偶中砂质纹层厚度影响小。而沉积相带的变化频率低,对层偶中砂质纹层厚度影响大。Abstract: Tidal couplet thickness variation and its genetic mechanism are studied through smoothing processing, Fourier transformation and wavelet analysis for the cores taken from the Well A located in the Pearl River Mouth Basin. We compared the thickness of sandy and muddy laminae with the couplets thickness. It reveals that the thickness variation of sandstone and mudstone is not only controlled by the tide cycles, but also affected by the changes in microfacies and event deposits. The tide cycles in high frequency, works like a sinusoidal wave, of which the affects to the thickness of sandy laminae is small. On the contrary, facies changes have great influences on the thickness of sandy laminae, even the frequency of the changes is low.
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