川东北通南巴背斜中新生代构造变形的砂箱构造物理模拟  

Analogue Modeling of Structural Deformation of Tongnanba Anticline in Mesozoic and Cenozoic,NE Sichuan Basin

作　　者：马德龙 王宏斌[1,2] 张希晨 何登发 凡睿[5] 王彦君 黄林军[1] 崔键 刘文强[2] 杨秀磊 Ma Delong;Wang Hongbin;Zhang Xichen;He Dengfa;Fan Rui;Wang Yanjun;Huang Linjun;Cui Jian;Liu Wenqiang;Yang Xiulei(Research Institute of Petroleum Exploration and Development-Northwest,PetroChina,Lanzhou 730020,China;Key Laboratory of Reservoir Description,PetroChina,Lanzhou 730020,China;Exploration Company,SINOPEC,Chengdu 610042,China;School of Energy Resources,China University of Geosciences,Beijing 100083,China;Research amd Development Center,BGP Inc.,CNPC,Zhuozhou 072750,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,China)

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]中国石油油藏描述重点实验室,甘肃兰州730020 [3]中石化勘探分公司,四川成都610042 [4]中国地质大学能源学院,北京100083 [5]中国石油东方地球物理公司物探技术研究中心,河北涿州072750 [6]东华理工大学地球科学学院,江西南昌330013

出　　处：《地球科学》2023年第4期1307-1320,共14页Earth Science

基　　金：中石化勘探分公司项目“通江地区须家河组裂缝发育规律研究”;中石油“十四五”前瞻性基础性重大科技项目(Nos.2021DJ0201,2021DJ0301).

摘　　要：通南巴背斜位于四川盆地东北部,紧邻北部米仓山和东北部大巴山两大造山带,开展通南巴背斜与不同造山带、川东北先存古隆起的时空耦合关系物理模拟研究,对于约束周缘造山带的构造变形时间和区域构造变形时序具有重要的科学意义,同时对川东北油气勘探也有指导作用.初始模型中,设计了北部推板和东北部推板分别代表米仓山和大巴山造山带的活动;下部硅胶层和上部石英砂层分别代表三叠系底部膏盐岩和上覆砂岩为主的碎屑岩;随着油气勘探的深入,川东北古生代隆起被逐渐接受,在模型底部用橡皮泥预制条带状构造代表古隆起.实验结果表明,北部推板挤压过程形成的速度场快速传递到橡皮泥(代表先存古隆起)之上的石英砂中,形成北东向的褶皱和断裂;东北部推板挤压过程形成的弧形构造带呈北西向展布,叠加在早期北东向构造上.通过梳理周缘造山带的隆升历史,并结合本次模拟实验结果,认为燕山期米仓山构造活动与古生代北东向隆起共同控制通南巴早期北东向构造的形成,燕山晚期和喜山期大巴山活动形成一系列北西向构造叠加在通南巴早期北东向构造之上,控制通南巴背斜须家河组北东向和北西向两组断裂-裂缝系统的形成.Tongnanba anticline is located in the Northeast Sichuan basin,which is adjacent to the Micangshan Mountain to the north and Dabashan Mountain to the northeast.Conducting analogue modeling on tectonic relationships between Tongnanba anticline with surrounding mountains and paleo-uplift has important significance for constraining orogenic tectonic deformation time and sequences in the region,and also has importance significance for oil and gas exploration.In the model,shortening from north and northeast represents Micangshan Mountain and Dabashan Mountain,respectively.Lower silicone and upper sand are used to represent salts of Leikoupo Formation in Triassic and upper clastic rocks,respectively.The plasticene in the model acts as uplift developed in Paleozoic in NE Sichuan basin,which is widely accepted.Experiment results show that during compression from north moving wall,velocity vectors rapidly transferred to plasticene,which representing paleo-uplift,to form NE fold and thrust.During compression from northeast moving wall,NW trend arc-shape structures were formed imposing on the earlier formed NE trend structure.Combining with earlier reports on evolution histories,it makes conclusions that the evolution of Tongnanba anticline was controlled by surrounding Micang and Daba orogenic belts to form tectonic superposition of earlier NE trend structures and later NW trend structures.While,the Paleozoic NE trend uplift in NE Sichuan basin also controlled the orientation of Tongnanba anticline.

关 键 词：川东北 通南巴背斜 古隆起 物理模拟 构造演化 构造地质学 

分 类 号：P548[天文地球—构造地质学]