东营凹陷东坡古近系沙三中亚段异重流沉积特征与沉积模式  

Sedimentary characteristics and depositional model of hyperpycnites in the middle of the third member of Paleogene Shahejie Formation in the east slope of Dongying Sag

作　　者：刘海宁[1,2] 韩宏伟[2] 操应长[1] 曲志鹏[2] 张云银[2] 杨田[3] LIU Haining;HAN Hongwei;CAO Yingchang;QU Zhipeng;ZHANG Yunyin;YANG Tian(School of Geosciences in China University of Petroleum (East China), Qingdao 266580, China;Institute of Geophysical Exploration, Shengli Oilfield Company, SINOPEC, Dongying 257022, China;Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石化胜利油田分公司物探研究院,山东东营257022 [3]成都理工大学沉积地质研究院,四川成都610059

出　　处：《中国石油大学学报（自然科学版）》2022年第1期13-22,共10页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(41802127,42072126);青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室开放基金项目(MGQNLM201816);2019年中国石油科技创新基金研究项目(2019D-5007-0106);中国石化科技攻关项目(P20060-1)。

摘　　要：通过三维地震、测录井资料、岩心分析、粒度分析、薄片分析和水槽模拟试验,对东营凹陷东坡古近系沙三中亚段异重流沉积的沉积特征、分布规律和沉积模式进行研究。结果表明研究区异重流沉积以泥砾岩、细砂岩和粉砂岩沉积为主,杂基平均质量分数为12.6%,成分成熟度较低,粒度概率累积曲线以反映重力流沉积的上拱弧形、宽缓上拱型和低斜两段式为主;侵蚀充填构造、平行层理、逆正粒序层理、沙纹层理、波状层理、块状层理和炭质碎屑层是异重流沉积典型的沉积构造;沉积近端王59井以泥质碎屑流和底床载荷主导的高密度异重流沉积垂向叠置为主要特征,沉积远端牛876井以悬浮载荷主导的低密度异重流沉积和漂浮沉积垂向叠置为主要特征;平面分布呈条带状,在沉积近端以碎屑流沉积为主,伴随搬运距离增加,碎屑流转化为异重流;湖盆异重流搬运演化过程经历流体潜入区、流体稳定厚度区和流体膨胀区,流体潜入区是决定侵蚀作用程度和范围的主要控制区域,流体稳定厚度区是底床载荷主导异重流沉积范围,流体膨胀区则是悬浮载荷和漂浮沉积物沉积区;断陷湖盆异重流沉积水道化特征不明显,沉积物粒度从粗到细均有发育,砂体的分布受古地貌控制可呈现条带状或扇状分布特征。The sedimentary characteristics,distribution pattern,and depositional model of hyperpycnites in the middle of the third member of the Paleogene Shahejie Formation in the east slope of Dongying Sag were studied,by combining three-dimensional seismic,logging data,core analysis,grain size analysis,thin section analysis and flume simulation experiments analysis.The results show that hyperpycnites in the study area are dominated by mud conglomerate,fine-grained sandstone and siltstone.The average content of matrix is 12.6%,and the maturity of the composition is low.The probability curve of particle size exhibit an upward arc with wide gentle shape,and has a low-inclination two-stage type,which are indication of gravity flow deposition.In the research area,typical sedimentary structures of hyperpycnites include erosion and filling structures,parallel bedding,inverse then normal grading sequence,ripple,wavy bedding,massive bedding and carbonaceous clastic layers.The Wang 59 well in proximal is mainly characterized by the vertical stacking of muddy debris flow deposits and high-density bed-load dominated hyperpycnal flow deposits.The Niu 876 well in distal is mainly characterized by the vertical stacking of low-density suspended load dominated hyperpycnal flow deposits and lofting deposits.There is an elongated shape in the plane distribution of debris flow deposits in proximal.With the increase of the transport distance,the debris flow is transformed into hyperpycnal flow.The transfer and evolution processes of hyperpycnal flow in the lacustrine basin undergo a fluid plunging zone,a fluid stabilization thickness zone and a fluid expansion zone.The fluid plunging zone determines the extent and scope of erosion,and the fluid stabilization thickness zone is the bed-load dominated hyperpycnal flow deposition zone,the fluid expansion zone is the suspended load dominated hyperpycnal flow and lofting sediment deposition zone.Channels are not obvious in hyperpycnites in lacustrine rift basins,and the grain size of the sediments

关 键 词：异重流 重力流 沉积特征 分布特征 沉积模式 断陷湖盆 

分 类 号：TE121.3[石油与天然气工程—油气勘探]