松辽盆地及周缘地区中二叠世岩相古地理研究

发布时间：2018-05-28 13:56

本文选题：松辽盆地 + 古生代　；参考：《吉林大学》2017年硕士论文

【摘要】：松辽盆地是位于中国东北部的大型陆相盆地,盆地呈菱形展布,长轴约750余公里,宽约350公里,面积约26万平方公里。中二叠世是盆地演化的重要的时期,中二叠世以前盆地为海相沉积,经中二叠世末期佳木斯古陆与华北地台闭合事件而进入陆相沉积。本次研究以踏勘资料、钻井资料为主,以大地构造资料、地质志资料、古生物资料为辅,严格按照等时性对比原则,完成岩相古地理编图。通过野外踏勘发现盆缘中二叠统分布广泛,在内蒙古东部、黑龙江中部、吉林中东部均有分布。主要发育浅水碳酸盐岩台地相(开阔台地相)、台地边缘斜坡相、三角洲相(三角洲前缘水下分流河道、河口坝、前三角洲相)、浅海相、半深海相、浊积扇相。中二叠统泥岩厚度多在130m至1470m之间,盆地西部阿尔山、东乌旗地区向东增厚,盆地北部罕达气地区泥岩向南方向增厚,盆地东部密山、尚志地区泥岩向西南方向增厚,泥地比同时也具有相同的递变关系,反映向盆地中心水体加深的现象;砂岩厚度多在200m至1300m,盆地西部二连浩特、东乌旗、阿尔山地区向东减薄,反映一个从西到东的物源体系,盆地北部多宝山至嫩江县地区砂岩向南减薄,反映一个从北到南的物源体系;在盆地东南部珲春至尚志地区砂岩向西北减薄,反映一个从东南到西北的物源体系。通过岩相划分方案恢复岩相古地理,表明中二叠统盆地西部主要为三角洲、滨浅海环境,发育滨浅海环境的泥岩-砂岩、砂岩-泥岩相,盆地中北部齐齐哈尔地区主要为滨浅海环境,发育滨浅海环境的泥岩-砂岩相、浅水台地碳酸盐岩相,盆地北部主要为三角洲、滨浅海环境,在盆地东部密山、尚志地区主要为三角洲、滨浅海环境,发育浅海环境的泥岩-砂岩、砂岩-泥岩相、浅水台地碳酸盐岩相,台地分布尤为广泛。
[Abstract]:Songliao Basin is a large continental basin located in northeast China. The basin is rhomboid, with a long axis of about 750km, a width of 350km and an area of 260000 km2. The Middle Permian is an important period in the evolution of the basin. Before the Middle Permian the basin was marine sedimentary and entered the continental facies through the closing events between the Jiamusi paleocontinent and the North China platform at the end of the Middle Permian. In this study, the exploration data, drilling data, geotectonic data, geological records and paleontological data were used as supplementary materials, and the lithofacies and paleogeography mapping was completed strictly according to the principle of isochronous comparison. Through field exploration, it is found that the middle Permian is widely distributed in the eastern part of Inner Mongolia, central Heilongjiang and central and eastern Jilin. There are mainly shallow water carbonate platform facies (open platform facies, platform margin slope facies, delta facies (delta front underwater distributary channel, estuarine dam, front delta facies, shallow sea facies, semi-deep sea facies, turbidite fan facies). The middle Permian mudstone thickness is between 130m and 1470m, the west of the basin is Alshan, the Dongwuqi area is thickened eastward, the mudstone of the Handa gas area in the northern part of the basin is thickened in the south direction, the eastern part of the basin is thickened in Mishan, and the mudstone in Shangzhi area is thickened to the southwest. At the same time, the mud-land ratio also has the same progressive relationship, reflecting the phenomenon of deepening towards the central water body of the basin. The sandstone thickness is mostly between 200m and 1300m, and in the western part of the basin, Erlianhaote, Dongwu Banner and Alshan are thinned eastward, reflecting a material source system from west to east. The sandstone thinning from Dobaoshan to Nenjiang County in the northern part of the basin reflects a material source system from north to south, and from Hunchun to Shangzhi in the southeastern part of the basin, the sandstone thinning to the northwest, reflecting a material source system from southeast to northwest. The restoration of lithofacies paleogeography through lithofacies division shows that the western part of the Middle Permian basin is mainly delta, shoreline environment, mudstone sandstone and sandstone mudstone facies developed in shoreline environment. The Qiqihar area in the central and northern part of the basin is mainly a shoreline environment with mudstone sandstone facies and shallow platform carbonate facies. The northern part of the basin is mainly delta and shallow-sea environment, and it is located in Mishan in the eastern part of the basin. The Shangzhi area mainly consists of delta, shoreline environment, mudstone sandstone, sandstone mudstone facies and carbonate facies of shallow water platform, which are widely distributed in shallow sea environment.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P534.46

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