摘要
克拉通盆地板内走滑断裂对碳酸盐岩岩溶及成藏具有重要控制作用,鄂尔多斯盆地主体斜坡区断裂隐蔽性强、分布杂乱,解析难度大,目前研究薄弱,制约了对盆地构造演化及多层系立体成藏认识.为此,以油区构造解析理论为指导,通过对鄂尔多斯盆地伊陕斜坡北部大牛地区块三维地震数据的精细解释,配置并厘定了研究区走滑断裂的构造特征及演化过程,为盆内碳酸盐岩层系走滑断裂整体研究及控藏作用提供依据.研究表明,(1)大牛地区块发育4条不同走向的走滑断裂,即近NS-NNE向石板太断裂、NW向秃尾河断裂和小壕兔断裂、NEE向台格庙断裂,具有垂向分层、走向分段特征.(2)大牛地区块走滑断裂的形成演化分为加里东-海西期、印支期、燕山期及喜山期等4个阶段,其中,从加里东-海西期持续至印支期形成右阶左行台格庙断裂及左阶右行石板太断裂北段;燕山期形成左阶右行秃尾河断裂及右阶左行石板太断裂南段.(3)大牛地区块走滑断裂的形成背景和机制受周边板块相互作用影响,其中,石板太断裂北段与台格庙断裂构成的X型断裂体系与扬子板块与华北克拉通碰撞挤压有关,而石板太断裂南段与秃尾河断裂构成的X型断裂体系则与古太平洋板块向欧亚板块的俯冲挤压有关.
The intraplate strike-slip faults of the craton basin play an important role in controlling carbonate karst and reservoir formation.The faults in the main slope area of the Ordos basin are highly hidden,distributed in disorder,and difficult to analyze.At present,the research is weak,which restricts the recognition of basin tectonic evolution and multi-layer system threedimensional reservoir formation.Guided by the structural analysis of oil area,the structural characteristics and tectonic evolution of strike-slip faults in the study area are configured and determined by using the fine interpretation of 3D seismic data of Daniudi block in Ordos basin.The study shows follows(1)there are four strike-slip faults with different strikes in Daniudi block,namely,the near NS-NNE trending Shibantai fault,the NW Tuweihe fault and the Xiaohaotu fault,and the NEE Taigemiao fault,which are characterized by vertical stratification and strike segmentation.(2)The formation and evolution of strike-slip faults in Daniudi block can be divided into four stages:Caledonian-Hercynian stage,Indosinian stage,Yanshanian stage and Himalayan stage.Among them,the right-step for left-lateral Taigemiao fault and the left-step for right-lateral northern Shibantai fault were formed from the Caledonian-Hercynian period to the Indosinian period;and the left-step for right-lateral Tuweihe fault and the right-step for leftlateral southern Shibantai fault were formed in the Yanshan period.(3)The formation background and mechanism of strike-slip faults in Daniudi block was affected by the interaction of surrounding plates.The X-type fault system composed of the northern Shibantai fault and Taigemiao fault is related to the collision and compression between the Yangtze plate and the North China craton,while the X-type fault system composed of the southern Shibantai fault and the Tuweihe fault is related to the subduction and compression of the ancient Pacific plate to the Eurasian plate.
作者
张威
杨明慧
李春堂
李竞赢
孙涵静
崇荔萍
陈杰
田刚
邢舟
Zhang Wei;Yang Minghui;Li Chuntang;Li Jingying;Sun Hanjing;Chong Liping;Chen Jie;Tian Gang;Xing Zhou(SINOPEC,North China Oil and Gas Branch Company,Zhengzhou 450006,China;College of Geosciences,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2023年第6期2267-2280,共14页
Earth Science
基金
国家自然科学基金资助项目(Nos.41172127,41572102)
中国石化科技部项目群课题(Nos.P20043⁃2,P21088⁃2,P20062⁃4).
关键词
走滑断裂
构造样式
构造演化
大牛地
鄂尔多斯盆地
石油地质.
strike-slip fault
structural style
tectonic evolution
Daniudi block
Ordos basin
petroleum geology.
