| 东海盆地西湖凹陷沉积记录的天文旋回响应 |
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| 引用本文： | 刘洋.东海盆地西湖凹陷沉积记录的天文旋回响应[J].地质科技通报,2020,39(3):120-128. |
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| 作者姓名： | 刘洋 |
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| 基金项目： | 国家科技重大专项2016ZX05027-001-005 |
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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。
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| 关 键 词： | 古新世 始新世 海平面变化 天文年代标尺 西湖凹陷 东海盆地 |
| 收稿时间： | 2019-02-27 |
Response to astronomical forcing of sedimentary record in Xihu Depression,East China Sea Basin |
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| 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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