三塘湖盆地中—下侏罗统沉积演化及聚煤规律研究

发布时间：2018-03-08 17:38

本文选题：三塘湖盆地　切入点：中下侏罗统　出处：《新疆大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国“疆煤东运”“疆电东送”重要基地之一的新疆哈密三塘湖煤田累计查明2000米以上浅煤炭资源量1200亿吨,预计进入开发期后年产量可达1亿吨,将成为全国最大的煤炭开发基地之一。本文基于全国最大规模煤田地质勘查项目新疆哈密地区巴里坤县三塘湖煤田普查-详查项目所获取的最新钻孔、测井、古生物等资料,应用层序地层学方法,将三塘湖盆地中下侏罗统划分为3个三级层序,并且通过沉积岩体叠置样式、岩相等的变化,将西山窑组划分出高位、湖侵、低位体系域,在三塘湖盆地西山窑组地层连井剖面层序对比的基础上建立了三塘湖盆地中下侏罗统地层格架。通过对427个钻孔岩心观察及测井响应识别出西山窑组主要发育扇三角洲、三角洲、湖泊、沼泽等4种主要沉积相类型,通过砂岩百分含量图、砾岩分布图等的编制,明确了三塘湖盆地物源主要来自西北部的大哈莆提克山、北部的苏海图山和东北部的克孜勒塔格山,盆地沉积中心位于中部的汉水泉和条湖凹陷区,由于喜山期的逆冲推覆运动,导致三塘湖盆地西南一侧的大部分深湖相被剥蚀,整个聚煤带受古气候、盆地基底沉降、沉积环境、可容空间变化的控制,煤层主要分布在湖侵体系域近最大湖泛面附近,通过研究发现沉降速率中等、陆源碎屑供给相对较少的地区往往是主要聚煤场所,从而发现在三角洲分流间湾以及湖泊相湖湾等地是利于煤、碳质泥岩聚集环境。
[Abstract]:Xinjiang Santanghu coalfield, one of the important bases for "transporting coal from Xinjiang to the east" and "transporting electricity from Xinjiang to the east", has identified a cumulative amount of 120 billion tons of shallow coal resources over 2, 000 meters, and the annual output is expected to reach 100 million tons after entering the development period. This paper is based on the latest drilling, logging, paleontology and other data obtained from the Santanghu Coalfield Survey in Barikun County, Xinjiang, which is the largest coal field geological exploration project in the country. By using sequence stratigraphy, the middle and lower Jurassic in Santanghu Basin is divided into three third-order sequences, and the Xishanyao formation is divided into highstand, lacustrine transgressive and lowstand system tracts by superposition of sedimentary rock mass and change of equal rock mass. The stratigraphic framework of middle and lower Jurassic in Santanghu Basin is established on the basis of sequence correlation of stratigraphic contiguous profile of Xishanyao formation in Santanghu Basin. The fan delta is identified by observing 427 borehole cores and logging response. There are four main sedimentary facies types, such as delta, lake and swamp. Through the compilation of sandstone percent content map and conglomerate distribution map, it is clear that the source of Santanghu basin mainly comes from the Daha Putik Mountains in the northwest. In the northern Suhaitu Mountains and the northeastern Keziletag Mountains, the sedimentary center of the basin lies in the Hanshuiquan and Tiaohu sag in the central part of the basin. As a result of the thrust and nappe movement in the Himalayan period, most of the deep lacustrine facies on the southwest side of the Santanghu Basin have been denuded. The coal accumulation zone is controlled by paleoclimate, basin basement subsidence, sedimentary environment, and capacitive space change. The coal bed mainly distributes near the largest lake flooding surface in the transgressive system tract, and it is found that the subsidence rate is moderate. The main coal accumulation sites are the regions where the continental clastic supplies are relatively small, thus it is found that the accumulation environment of coal and carbonaceous mudstone is favourable to coal and carbonaceous mudstone accumulation in delta distributary bay and lacustrine lacustrine lake bay.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11;P534.52

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