多断湖盆构造控砂与沉积充填过程——以渤海湾盆地济阳坳陷沾化凹陷东部始新统为例  

Control of tectonics on sedimentation of sandstone and process of sediment filling in multi-fault lacustrine basins: A case study on the Eocene in eastern Zhanhua Sag,Jiyang Depression in Bohai Bay Basin

作　　者：董道涛 邱隆伟[1,2] 马永达 杨勇强[1,2] 邹毓[4] 代莉 滕宝刚[3] 张在鹏[3] Dong Daotao;Qiu Longwei;MA Yongda;Yang Yongqiang;Zou Yu;Dai Li;Teng Baogang;Zhang Zaipeng(School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology,Qingdao,Shandong 266071,China;Zhuangxi Oil Production Plant of Shengli Oilfield Company Ltd.,SINOPEC,Dongying,Shandong 257000,China;School of Geosciences,Yangtze University,Wuhan,Hubei 430100,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]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]中国石化胜利油田分公司桩西采油厂,山东东营257000 [4]长江大学地球科学学院,湖北武汉430100

出　　处：《石油与天然气地质》2018年第4期653-663,共11页Oil & Gas Geology

基　　金："十二五"国家油气重大专项(2011ZX05009-002);山东省自然科学联合基金项目(ZR2016DL05)

摘　　要：构造控砂一直为断陷盆地分析调查工作的重点和难点。综合井-震、岩心和镜下鉴定资料,以渤海湾盆地济阳坳陷沾化凹陷东部始新统沙四上亚段—沙三段(SQ1—SQ3)为例,探讨构造主导下的控砂机制和沉积充填过程,取得认识如下:1)Ⅰ级构造转换带奠定盆地宏观构造-沉积格局,多阶构造坡折叠合湖平面升降控制三级层序内部体系域之间的砂体加积与沉积体系旋回性变化,Ⅱ级构造坡折和次级断层控制体系域内局部输砂系统和砂体展布,陡坡带往往不利于碎屑物质注入湖盆;2)SQ1—SQ2存在孤北和孤南两个独立输砂系统,SQ3两个输砂系统合二为一,SQ1主要发育进退积不明显的、小而多的扇三角洲,SQ2开始发育三角洲、(半)深湖和滑塌砂体,SQ3主要发育大型三角洲,(半)深湖区广泛发育滑塌砂体;3)构造活动通过构造转换带、坡折带、次级断层和陡坡带等主导多断湖盆控砂机制和沉积充填过程,气候仅可强化或弱化前者的控制作用,但不会改变盆地充填过程。Extensive research has been carried out on the control of tectonics on sedimentation of sandstone in rift basins.The tectonic-dominated mechanism controlling sandstone development and the process of sediment filling for the upper 4 th-3 rd member of the Eocene Shahejie Formation(the E s 4 and the E s 3)in eastern Zhanhua Sag,Jiyang Depression in Bohai Bay Basin,were investigated through well-seismic correlation,core description and thin section observation.The results show that(1)level-Ⅰtectonic transition zones lay down the macroscopic tectonic-sedimentary framework,and multi-stage tectonic slope breaks and eustatic lake level control the sand body accretion of different system tracts in the third-order sequences and the cyclicity of sedimentary systems;while level-Ⅱtectonic slope break zones and secondary faults control the local sand transport systems and sand body distribution within the system tracts,and steep slope zones are often infavorable for input of clastics into lake basins;(2)SQ1 and SQ2 have two isolated sand transport systems(Gubei and Gunan),while SQ3 has a single sand transport system with the Gubei and Gunan being combined into one,so small but numerous fan deltas without significant progradation or retrogradation are mainly developed in SQ1,while deltas,(semi-)deep lake and gravity flow sand bodies occur in SQ2,and large-scale deltas are dominant in SQ3,with gravity flow sand bodies being common in the(semi-)deep lake area;(3)Tectonic activities control,via tectonic transition zones,slope breaks,secondary faults and steep slopes,sandstone development and sediment filling process in multi-fault lacustrine basins,whereas paleoclimate can only function to strengthen or weaken the controlling effect of tectonic activities,but will not change the sediment filling process in the basin.

关 键 词：构造转换带 构造坡折带 控砂机制 沉积充填 断陷盆地 沙河街组 济阳坳陷 渤海湾盆地 

分 类 号：TE121[石油与天然气工程—油气勘探]