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对珠江口盆地珠一坳陷惠州凹陷北部HZ0811井和惠陆低凸起HZ1811井中中新世-上新世的韩江组、粤海组和万山组自然伽马测井曲线进行频谱分析和小波分析,识别出显著的米兰柯维奇沉积旋回.通过对短偏心率旋回进行高斯带通滤波,建立了HZ0811井和HZ1811井的“浮动”天文年代标尺.两口井的万山组、粤海组和韩江组分别记录了35个、56个和64个短偏心率旋回,据此估计出万山组沉积时限约为3.5Ma,粤海组沉积时限约为5.6Ma,韩江组沉积时限约为6.4Ma.根据天文年代标尺计算出HZ0811井和HZ1811井韩江组-万山组的沉积速率,结果表明沉积速率变化显示出明显的1.0Ma和0.4Ma的旋回性,可能与长偏心率周期(1.0Ma和0.4Ma)控制的海平面变化有关.
Spectral analysis of the natural gamma ray logging curves from the Miocene-Pliocene Hanjiang Formation, the Yuehai Formation and the Wanshan Formation in the HZ0811 well in the Huizhou depression and the HZ1811 well in the Huilu depression in the Zhuya Depression in the Pearl River Mouth Basin Wavelet analysis identified a significant Milankovitch sedimentary cycle. The “floating” astronomical date scale was established for wells HZ0811 and HZ1811 by Gaussian band-pass filtering of short eccentricity cycles. The Wanshan Formation, Yuehai 35 and 56 and 64 short eccentric cycles are recorded respectively in the Hanjiang Formation and Hanjiang Formation. Based on this, it is estimated that the sedimentary time of Wanshan Formation is about 3.5Ma, that of Yuehai Formation is about 5.6Ma, and that of Hanjiang Formation About 6.4Ma. According to the astronomical date scale, the sedimentation rate of Hanjiang Formation-Wanshan Formation in HZ0811 well and HZ1811 well is calculated. The results show that the sedimentary rate shows a significant cyclicity of 1.0Ma and 0.4Ma, which may be related to long eccentricity Cycle (1.0Ma and 0.4Ma) control sea level changes.