青海团鱼山地区层序地层与聚煤规律研究

发布时间：2018-07-12 11:03

  本文选题：沉积特征 + 层序地层　； 参考：《西安科技大学》2017年硕士论文

【摘要】：团鱼山地区位于柴达木盆地北缘,赛什腾山南麓,隶属青海省大柴旦行委辖区内。包括团鱼山北部及昆源露天煤矿、团鱼山(中部)、结绿素,是柴北缘重点煤产地之一。利用现有资料开展该区聚煤规律研究对指导外围煤炭资源勘查、提高勘查地质效果,具有重要的理论意义和实际意义。本文以团鱼山地区现有的煤炭勘探地质成果资料为基础,总结分析了研究区侏罗系沉积体系和层序地层格架,重点分析了基于层序地层格架的岩相古地理及其演化特征,最后分析了研究区侏罗系聚煤规律及进一步找煤方向。团鱼山地区总体为向南西倾的单斜,后期受喜马拉雅造山运动的影响,形成叠瓦状逆冲推覆构造体系。区域断裂呈北西西-南东东向延展,与地层总体走向一致。含煤地层为中侏罗统大煤沟组及石门沟组,石门沟组含煤5层,大煤沟组含煤2层,共含煤7层。研究区为陆相沉积体系,主要沉积相有辫状河、辫状河三角洲和湖泊沉积相。通过对研究区层序地层研究,可将区内侏罗系划分为4个三级层序(SⅢ1 — SⅢ4)。通过分析认为,其煤层主要发育在中侏罗世大煤沟组层序SⅢ1沉积期的辫状河冲积平原上,其次为中侏罗世石门沟组层序SⅢ2和层序SⅢ3沉积期辫状河三角洲和滨浅湖相带。其聚煤作用主要受控于古气候、基底沉降、沉积环境和基准面变化。从成煤环境角度分析,预测团鱼山南部为有利找煤区,层序SⅢ1-层序SⅢ2为主要找煤层位。
[Abstract]:Tuanyushan area is located in the northern margin of the Qaidam Basin, the southern foot of the Saiteng Mountain, belonging to the Daqidan Commission area of Qinghai Province. Including Tuanyushan North and Kuanyuan opencast coal mine, Tuanyushan (central), green pigment, is one of the key coal production areas in the northern margin of Qaidam. It is of great theoretical and practical significance to use existing data to study the law of coal accumulation in this area to guide the exploration of peripheral coal resources and to improve the geological effect of exploration. Based on the existing geological data of coal exploration in Tuanyushan area, this paper summarizes and analyzes the Jurassic sedimentary system and sequence stratigraphic framework in the study area, and emphatically analyzes the lithofacies and palaeogeography based on the sequence stratigraphic framework and its evolution characteristics. Finally, the law of Jurassic coal accumulation and the direction of further coal searching are analyzed. The Tuanyushan area is a monocline inclined to the south and west, and the imbricate thrust nappe system was formed in the late stage by the Himalayan orogenic movement. The regional faults extend in the NW-SE direction, consistent with the overall strike of the strata. The coal-bearing strata are middle Jurassic Dachaigou formation and Shimenggou formation, the Shimengou formation contains 5 coal layers, the Dachaigou formation contains 2 coal layers, and there are 7 coal layers. The main sedimentary facies are braided river, braided river delta and lacustrine sedimentary facies. By studying the sequence stratigraphy of the studied area, the Jurassic system in this area can be divided into four third-order sequences (S 鈪，

本文编号：2116951