准南侏罗-白垩纪原型盆地边界变迁及其沉积物源响应  

Boundary Changes of Jurassic-Cretaceous Prototype Basin of Southern Junggar and Responses of Sedimentary Provenance and Depositional Systems

作　　者：高崇龙 王剑[2] 刘明[2] 罗正江[2] 王柯 刘可 任影 邓毅 Gao Chonglong;Wang Jian;Liu Ming;Luo Zhengjiang;Wang Ke;Liu Ke;Ren Ying;Deng Yi(College of Petroleum,China University of Petroleum(Beijing)at Karamay,Karamay 834000,China;Research Institute of Experiment and Detection of PetroChina Xinjiang Oilfield Company,Karamay 834000,China;College of Geosciences,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000 [2]中国石油新疆油田公司实验检测研究院,新疆克拉玛依834000 [3]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《地球科学》2024年第1期103-122,共20页Earth Science

基　　金：国家自然科学基金项目(No.41902118);中国石油大学(北京)克拉玛依校区科研启动基金项目(No.XQZX20230010);新疆维吾尔自治区自然科学基金项目(No.2022D01B41)。

摘　　要：为明确准南侏罗-白垩纪原型盆地特征及其物源-沉积体系演化,对准南山体年龄及侏罗-白垩系砂岩碎屑成分、砾岩砾石成分、重矿物、古水流及砂体展布等时空变化进行分析,定量计算原盆边界距离,同时结合区域地质背景,探讨原盆边界变迁及其沉积物源响应.准南西段山体隆升整体早于中段和东段,侏罗-白垩系物源以再循环造山带沉积岩系母岩为主,原盆距现今边界平均距离在22.2~67.0 km之间.准南西段受控于南北双向物源体系,中晚侏罗世原盆边界发生明显萎缩,并受车莫古隆起演化影响显著;中段受控于南部物源体系,原盆边界在中侏罗世早期前发生持续扩张,随后持续萎缩;而东段在侏罗纪原盆边界持续萎缩,且博格达山自中侏罗世开始持续隆升使区域物源沉积体系发生显著变化.整体上,现今西段和东段区域在晚侏罗世距原盆边界距离更近,近源沉积体系规模连片砂体较发育,而中段在整个侏罗纪距原盆边界较远,远源沉积体系使规模连片砂体不甚发育.早白垩世,整个准南南部边界已基本萎缩至现今盆地边界附近,但区域湖泛作用使近源沉积体系分布局限.In order to clarify the characteristics and provenance-sedimentary system of the J-K prototype basin in southern Junggar,in this study it firstly analyzes the age data of mountains along the basin margin,and the temporal-spatial changes of Jurassic-Cretaceous sandstone clastic composition,conglomerate gravel composition,heavy minerals,paleo-currents,sedimentary sand body distribution.Then the original basin boundary distances are quantitively calculated.Together with the regional geological background,the boundary changes,and sedimentary provenance and depositional system evolution of the Jurassic-Cretaceous prototype basin in southern Junggar are restored.The research results show that the uplifting time of the mountains in the western section of the southern Junggar is overall earlier than the middle and eastern sections.And the parent rocks of the Jurassic-Cretaceous sedimentary provenance are mainly recirculating orogenic belt sedimentary rock.The distance between the boundary of prototype and nowadays basins is 22.2-67.0 km.The western section of southern Junggar is controlled by north and south provenance systems and influenced by the evolution of Chemo paleouplift.And the basin boundary has showed shrinking processes since Middle Jurassic.The middle section of southern Junggar is controlled by southern provenance system,and the basin boundary continuously expanded from the Early Jurassic to early period of the Middle Jurassic,and then began to shrink.In contrast,the basin boundary of eastern section continuously shrunk during the whole Jurassic.However,uplift processes of the Bogda Mountain since the Middle Jurassic have caused significant changes in the regional provenance-sedimentary system.Overall,current areas of the western and eastern sections are closer to the prototype basin boundary during the Late Jurassic,therefore,the proximal sedimentary systems are relatively well developed.However,the locations of the mid part of southern Junggar during the whole Jurassic are far from the original basin boun

关 键 词：准噶尔盆地南缘 侏罗-白垩纪 原型盆地 盆地边界 沉积物源 石油地质 

分 类 号：P56[天文地球—构造地质学]