董欣君, 冯振东, 宁淑媛,等.东营凹陷沙四上细粒沉积岩段米兰科维奇旋回及沉积响应[J].河南理工大学学报（自然科学版）,2022,41(2):46-56.

DONG X J, FENG Z D, NING S Y, et al. Milankovitch cycle and sedimentary response of the  fine-grained sedimentary rocks in Dongying depression[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(2):46-56.

东营凹陷沙四上细粒沉积岩段米兰科维奇旋回及沉积响应

董欣君1, 冯振东1, 宁淑媛1, 张鹏飞2, 陈涛2, 张琳1, 高迪1, 吴伟1

1.河南理工大学 资源环境学院,河南 焦作454000;2.中国石油化工股份有限公司 胜利油田分公司勘探开发研究院,山东 东营 257000

摘要:米兰科维奇旋回是是研究细粒沉积物旋回性变化的一种重要理论和方法。以东营凹陷沙四上纯上次亚段深湖相细粒沉积岩为研究对象,通过对自然伽马测井数据的小波和频谱分析,对LY1井目标层段的深水细粒沉积岩进行米兰科维奇旋回划分,将划分结果与对应的岩石地球化学元素指标和矿物成分指标进行对比,分析受控于米兰科维奇旋回的沉积响应特征。结果表明：沙四上纯上次亚段可识别出2.5个IV级旋回,10个V级旋回,28个VI级旋回；东营凹陷细粒沉积岩在古气候、古氧相、古水深、古物源,古盐度等方面的演化阶段性明显,可划分为2个沉积环境演化阶段。长偏心率周期可分为暖湿气候半周期和干冷气候半周期：暖湿气候半周期内,地表径流较多,陆源输入多,有机质含量高,对应的岩性组合以富有机质为主要特征,常见层状、纹层状沉积构造；干冷气候半周期内,地表径流和陆源输入较少,岩性组合以贫有机质为特点,沉积构造以块状构造和层状构造为主。沙四上纯上次亚段沉积环境与天文旋回之间对应较好,长偏心率周期对湖相细粒沉积演化具有重要的控制作用。

关键词:米兰科维奇旋回;细粒沉积岩;沉积环境;沙四上纯上次亚段;东营凹陷

doi:10.16186/j.cnki.1673-9787.2020090066

基金项目:国家自然科学基金资助项目（417872112）

收稿日期:2020/09/15

修回日期:2020/10/26

出版日期:2022/03/15

Milankovitch cycle and sedimentary response of the  fine-grained sedimentary rocks in Dongying depression

DONG Xinjun1, FENG Zhendong1, NINGShuyuan 1, ZHANG Pengfei2, CHENTao 2, ZHANG Lin1, GAO Di1, WU Wei1

1.College of resources and environment, Henan Polytechnic University, Jiaozuo 454000 , Henan, China;2.Exploration and Development Research Institute, ShengH Oilfield Branch of Sinopec, Dongying  257000 , Shandong, China

Abstract: : Milankovitch cycle is an important theory and method that is usually utilized to study the cyclicity of fine-grained sediment.In this paper,deep-lake fine-grained rocks of the   in the Dongying depression were studied by means of wavelet change and spectrum analysis of natural gamma logging data.Milankovitch cycle division was carried out on the deep-water fine-grained rocks in the cores of well LY1,the results were compared with the corresponding petrogeochemical and mineral indices,and the sedimentary responses controlled by the Milankovitch cycles were analyzed.The results showed that 2.5 fourth-order,10 fifth-order,and 28 sixth-order cycles could be identified in the   section.The fine-grained rocks in the Dongying depression had obvious evolutionary stages in paleoclimate,paleowater depth,paleosalinity,paleoredox,and sediment supply,which could be divided into two stages.Long eccentricity period was divided into a warm-wet semi-cycle and a dry-cold semi-cycle.During the former,there were more surface runoff,more abundant terrigenous debris supply,and higher organic matter content.The lithologic assemblages corresponding to the warm-wet semi-cycle were mainly characterized by layered and laminated structures.During the latter,there were little surface runoff,smaller amount of terrigenous debris supply,and lower organic matter content.The lithologic assemblages corresponding to the dry-cold semi-cycle were mainly characterized by blocky and layered structures.As a result,there was a good correlation between the sedimentary environment and the astronomical cycle,and the long eccentricity period might have played an important role in the evolution of the lacustrine fine grains deposition.

Key words:Milankovitch cycle;fine-grained rock;sedimentary environment; ;Dongying depression

 东营凹陷沙四上细粒沉积岩段米兰科维奇旋回及沉积响应_董欣君.pdf