Response to astronomical forcing of sedimentary record in Xihu Depression, East China Sea Basin
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摘要: 基于东海陆架盆地古新世-始新世前人解释的三级层序成果，认为东海陆架盆地现有的三级层序划分不足以满足当下研究的需要，由此开展了旋回地层与层序地层研究，重新将三级层序界面的与基于对岩性及地震相特征变化的解释相结合，加入了天文旋回驱动的机制，阐明海平面变化驱动三级层序的特征。以东海陆架盆地西湖凹陷的BSH-1井及其相邻的NB-25-2-1井为研究对象，结合地层学研究基础，选取GR测井曲线为古气候替代指标，应用旋回地层学的理论及其时间序列分析、频谱分析技术的方法，对两口典型钻井进行了天文旋回分析，借助邻井时间锚点建立了有效的天文年代标尺，探讨了斜率周期信号变化的振幅调制的约1.2 Ma长周期与海平面变化以及三级层序发育的关系，认为东海陆架盆地三级层序受控于稳定的约1.2 Ma的斜率振幅调制周期。最终形成一套绝对天文年代标尺与一套三级层序划分方案。Abstract: In this study, we have investigated the third-order sequences interpreted by the previous researchers of Paleocene-Eocene in the East China Sea Basin, and believe that the interpretation of the third-order sequences is mainly based on the interpretation of seismic and lithologic changes, which is basically consistent with the previous interpretation of the stratigraphic stages, and cannot truly reflect the characteristics of the third-order sequences driven by the change of sea-level. This paper takes well BSH-1 and its adjacent well NB-25-2-1 in Xihu Depression, East China Sea Basin as the research objects and selects GR logging curve as the paleoclimate alternative index. Based on the theory of cyclostratigraphy, this study, combining with the previous stratigraphic research data, conducted spectrum analysis and time series analysis, and analyzed the astronomical cycle of the two wells. Then, the paper establishes an effective astronomical chronograph and discusses the slope cycle information.The relationship between the 1.2 Ma long period of amplitude modulation and sea level change and the development of the third-order sequence shows that the third-order sequence in East China Sea Basin is controlled by the stable 1.2 Ma slope amplitude modulation period. Finally, a set of absolute astronomical time scale and a set of third-order sequence division plan are formed.
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Key words:
- Paleocene /
- Eocene /
- sea-level /
- astronomical time scale /
- Xihu Depression /
- East China Sea Basin
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图 1 东海陆架盆地三级层序划分方案及海平面变化研究现状
Figure 1. Third-order sequence division and sea-level change of the East China Sea Basin
图 2 东海陆架盆地西湖凹陷位置与地质背景示意图(a)及BSH-1井研究井位(b)
Figure 2. Location and geological background of Xihu Depression (a) and well BSH-1 (b)
图 3 BSH-1井深度域演化图谱(a)与岩性(b)以及GR曲线(c)
滑动窗口150 m，重采样间隔0.1 m；滑动窗口选择略大于深度域，最大识别出的405 ka长偏心率沉积厚度
Figure 3. EFFT(a), lithology (b) and GR log curve (c) of well BSH-1
图 5 BSH-1井时间域斜率的振幅调制与调整到GTS2012的文献[8]中的海平面变化曲线对比
Figure 5. Amplitude modulation of time domain obliquity of well BSH-1 compared with sea-level change curve of Haq et al.(1987) adjusted to GTS2012
图 6 BSH-1井斜率的振幅调制频谱与文献[14]中的频谱以及La2004中的斜率理论曲线的振幅调制频谱对比
a.BSH-1井的时间域GR曲线的斜率滤波振幅调制曲线MTM频谱，斜率的滤波频带宽度(0.025 ± 0.006)旋回数/Ma，振幅的包络线用Taner-Hilbert方法提取；文献[14]的海平面变化曲线7.5~40.2 Ma范围的MTM频谱；c.数值解La2004中斜率曲线0.2~40.2 Ma范围的频谱的振幅调制曲线MTM频谱，斜率的滤波带宽(0.025±0.002)旋回数/Ma; 图中数字为横坐标的倒数
Figure 6. Comparison of amplitude modulation spectrum of obliquity of well BSH-1 with that of Miller et al.(2005) and obliquity theoretical curve in La2004
表 1 BSH-1井主要层序界面绝对ATS年龄与原定年对比
Table 1. Absolute ATS age of main sequence boundary of well BSH-1 compared with the original age
层段 顶深/m 底深/m 层厚/m 底界面 浮动ATS/ka 绝对ATS/Ma 原定年/Ma 调整到GTS2012/Ma 花港组上段 2 039.8 2 409 369.2 T21 24 796 24.996 - - 花港组下段 2 409 2 535 126 T30 26 755 26.955 - - 平湖组一二段 2 535 2 686.5 151.5 T32 28 517 28.717 - - 平湖组三段 2 686.5 2 844 157.5 T33 29 863 30.063 49 47.8 平湖组四段 2 844 3 135.5 291.5 T34 33 062 33.262 - - 平湖组五段 3 135.5 3 447.6 312.1 T35 36 155 36.355 - - 误差范围：±0.4 Ma；原定年据文献[5, 9] 
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