珠江口盆地珠一坳陷韩江组-万山组旋回地层学

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3.5 Ma, 粤海组沉积时限约为5.6 Ma, 韩江组沉积时限约为6.4 Ma.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1.0 Ma和0.4 Ma的旋回性, 可能与长偏心率周期(1.0 Ma和0.4 Ma)控制的海平面变化有关. 

Cyclostratigraphy Research on the Hanjiang-Wanshan Formations in Zhuyi Depression,Pearl River Mouth Basin

Spectral analysis and continuous wavelet analysis were conducted on the natural gamma ray logging data from the Middle Miocene-Pliocene Hanjiang, Yuehai and Wanshan formations of well HZ0811 and HZ1811, which locate at northern Huizhou depression and Huilu low uplift at Zhuyi depression, respectively. Significant Milankovitch sedimentary cycles were identified, and "floating" astronomical time scales of well HZ0811 and HZ1811 were established through Gaussian band filtering of short eccentricity signals. The Wanshan, Yuehai and Hanjiang formations record 35, 56 and 64 short eccentricity cycles, which indicate the duration of Wanshan, Yuehai and Hanjiang formations can be estimated as 3.5, 5.6 and 6.4 Ma, respectively. The sedimentary rate of Hanjiang-Wanshan formations of well HZ0811 and HZ1811 were calculated according to floating astronomical time scale. The variations of sedimentary rate indicate significant 1.0 Ma and 0.4 Ma cyclicities, which may be related to the sea level change controlled by long eccentricity cycles.