石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (6): 1205-1214.doi: 10.11743/ogg20190605

• 油气地质 • 上一篇    下一篇

基于米兰科维奇理论的湖相细粒沉积岩高频层序定量划分

石巨业1,2,3, 金之钧1,2, 刘全有1,2, 黄振凯1,2, 张瑞4   

  1. 1. 页岩油气富集机理与有效开发国家重点实验室, 北京 100083;
    2. 中国石化 石油勘探开发研究院, 北京 100083;
    3. 中国地质大学(北京) 能源学院, 北京 100083;
    4. 中国石油大学(华东) 地球科学与技术学院, 山东 青岛 266580
  • 收稿日期:2018-07-07 修回日期:2019-08-16 出版日期:2019-12-28 发布日期:2019-10-15
  • 通讯作者: 金之钧(1957-),男,中国科学院院士,石油地质。E-mail:jinzj.syky@sinopec.com。 E-mail:jinzj.syky@sinopec.com
  • 第一作者简介:石巨业(1989-),男,博士,非常规油气地质。E-mail:shijuyeone@163.com。
  • 基金项目:
    国家自然科学基金项目(41625009;41702137);中国科学院战略性先导科技专项A类(XDA14010404)。

Quantitative classification of high-frequency sequences in fine-grained lacustrine sedimentary rocks based on Milankovitch theory

Shi Juye1,2,3, Jin Zhijun1,2, Liu Quanyou1,2, Huang Zhenkai1,2, Zhang Rui4   

  1. 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China;
    2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;
    3. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    4. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China
  • Received:2018-07-07 Revised:2019-08-16 Online:2019-12-28 Published:2019-10-15

摘要: 湖相的细粒沉积同时具有高度的连续性和分辨率,其忠实地记录了湖泊流域的气候和环境变化的信息,由于沉积过程的稳定性,使得这种湖相细粒沉积成为米兰科维奇旋回分析的理想载体,而米兰科维奇理论的时间内涵是进行高频旋回划分和对比有效手段,可以提高地层划分的时间分辨率,是传统层序地层学的有力补充。精确识别米氏旋回是湖相细粒沉积岩高频层序划分的基础,约束沉积速率的变化是米氏旋回识别的关键。针对陆相沉积地层相变快、非均质性强等特点,以磁化率作为替代性指标,引入进化谐波(EHA)和平均频谱拟合差(ASM)分析技术,约束纵向上沉积速率的变化,更精确识别米兰科维奇旋回信号。结合高分辨率层序地层学基准面旋回理论,四级层序与中期基准面旋回对应,时间量化为405 kyr;五级层序与短期基准面旋回对应,时间量化为100 kyr;六级层序与超短期基准面旋回对应,时间量化为40 kyr,最终分别以长偏心率、短偏心率和斜率周期曲线作为四级、五级和六级层序划分的参考曲线,实现湖相细粒沉积岩高频层序定量划分。

关键词: 米兰科维奇理论, 天文周期, 旋回地层学, 高频层序, 细粒沉积岩, 东营凹陷

Abstract: Fine-grained lacustrine sedimentary rocks are characterized by high continuity and resolution,and can faithfully record the changes in climate and environment of lacustrine basins.Considering the high stability during deposition,these sedimentary rocks have been regarded as good information carriers to identify Milankovitch cycles;while in return,the recognition of time connotation of the Milankovitch theory is an effective way to perform classification and correlation of high-frequency cycles,and to improve the temporal resolution of stratigraphic classification,thus being a powerful complement to the conventional sequence stratigraphy.The accurate identification of Milankovitch Cycles is the basis for the classification of high-frequency sequences in the fine-grained lacustrine sedimentary rocks,and constraining the variation of sedimentary rate is the key to the recognition of Milankovitch Cycles.In view of the fast transformation of sedimentary facies and strong heterogeneity in continental sedimentary sequences,we used the magnetic susceptibility as a proxy.In addition,the evolutive harmonic analysis (EHA) and average spectral misfit (ASM) techniques were introduced to constrain the vertical variation of sedimentary rate,so as to more accurately recognize signals of Milankovitch Cycles.Combined with the base level cycle theory in high-resolution sequence stratigraphy,we found that the fourth-order sequence corresponds to the medium-term base level cycle and the time is quantified as 405 ka;the fifth-order sequence corres-ponds to the short-term base level cycle and the time is quantified as 100 ka;and the sixth-order sequence corresponds to the super-short-term base level cycle ant the time is quantified as 40 ka.Finally,the periodic curves of long-eccentricity,short-eccentricity and tilt are taken as referential curves for classification of the fourth-,fifth-and sixth-order sequence,and thus the quantitative classification of high-frequency sequences of fine-grained lacustrine sedimentary rocks can be achieved.

Key words: Milankovitch theory, astronomical cycle, cyclostratigraphy, high-frequency sequence, fine-grained sedimentary rock, Dongying Sag

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