论文中文题名: | 青海省木里煤田哆嗦公马地区聚煤规律研究 |
姓名: | |
学号: | G11171 |
学科代码: | 081803 |
学科名称: | 地质工程 |
学生类型: | 工程硕士 |
学位年度: | 2016 |
院系: | |
专业: | |
第一导师姓名: | |
论文外文题名: | Study on coal accumulation in Muli Coalfield, Duosuo Gongma Area, Qinghai province |
论文中文关键词: | |
论文外文关键词: | Coal accumulation ; sedimentary facies ; shaking stallion area ; Muli Coalfield |
论文中文摘要: |
本文以哆嗦公马地区及木里煤田现有的地质报告、物探资料及前人研究成果为基础,以沉积学、煤田地质学及构造地质学理论为指导,以聚煤规律研究为主线,以木里组地层的研究为重点,采取地质与物探相结合、地表出露与钻探控制相结合、野外细致观察与室内宏观分析相结合,在研究木里煤田及构造、地层基础上,分析研究区含煤地层发育特征和沉积相特征,建立聚煤模式,并从从古气候、聚煤盆地演化过程、古地理格局及后期控煤构造4方面进行聚煤因素分析。
哆嗦公马地区位于青海省海西州天峻县木里镇境内,属秦祁昆地层区的中祁连山分区,研究区内构造发育,以逆冲断层为主,褶皱发育。属于湖泊沉积体系,进一步划分了滨湖、浅湖、深-半深湖3个相,对各亚相进行了沉积微相划分,并描述了各沉积微相特征,其中滨湖亚相中的滨湖沼泽微相在气候潮湿时,有利于大量的木本植物生长,是聚煤最有利的沉积微相。
哆嗦公马地区主要的含煤地层为侏罗系中统木里组和江仓组,其中木里组是最主要的含煤地层,下含煤段下1、下中、下2煤层全区发育,厚度大为本区主要的煤层,通属半亮型煤,具特低挥发份及低硫份特征。早、中侏罗世为亚热带潮湿气候,有利于成煤植物生长,为煤层发育提供了良好的物质基础。侏罗晚期沉降曲线呈下凹形,反映裂谷盆地性质,为煤层堆积提供了较大可容空间。印支期NE向的挤压,控制侏罗系含煤建造的同沉积断裂,断裂两侧的煤系沉积及其含煤发育特点具有明显差异。燕山运动早期和中晚期分别以ES向的挤压为主,和NNE向的挤压为主,是主要的控煤构造发育时期。中侏罗世早期南祁连盆地主要为辫状河三角洲及湖泊沉积,木里煤田及哆嗦公马地区为湖泊沉积,属有利聚煤环境。逆冲-褶皱为研究区主要的控煤构造, F3断层下降盘,褶皱发育,煤层发育多且煤层厚度大,是厚煤层主要的赋存区。
﹀
|
论文外文摘要: |
This paper is based on the existing geological report, geophysical exploration data and previous research results in Muli Coalfield and Duosuo Gongma Area, based on sedimentology, coal geology and structural geology theory as a guide, to study the accumulation rules of coal as the main line, in order to study the Muli formation as the key point, take the combination of Geology and geophysical, outcrops and drilling control of the combination of macro analysis of field observation and indoor meticulous combination in the study of Muli Coalfield and tectonic strata, on the basis of analysis of coal bearing zone characteristics of stratigraphy and sedimentary facies characteristics, establish coal accumulation model, and from the ancient climate, coal accumulating basin evolution process, and the later ancient geographical pattern of coal controlling structure 4 for coal accumulation factor analysis.
Duosuo Gongma area is located in Muli Town, Haixi state, Qinghai Province, the territory that belongs to Qinling Qilianshan Kunlunshan stratigraphic region in Qilian mountain area, tectonic development in the study area, dominated by thrust faults and folds developed. The main coal bearing strata of Jurassic in EC group Muli and Jiangcang formation, which Muli group is the main content of coal bearing strata, containing coal under paragraph 1, in, under 2 coal seam in the region's development. The thickness is the main coal seams in this area, is a semi - bright fine coal, with low volatile and low sulfur characteristics.
Duosuo Gongma area belongs to lacustrine depositional system, further divided into three phases the lakeside, shallow lake, deep-semi deep lake, of each sub phases were sedimentary micro facies, and describe the characteristics of sedimentary microfacies, which Lake sub facies of the lakeshore swamp microfacies in the humid climate, conducive to the growth of a large number of woody plants is coal accumulating the most favorable sedimentary microfacies.
Early, Middle Jurassic is a subtropical humid climate, is helpful to the coal plant growth, for the development of coal seam provides good material base.
The late Jurassic settlement curve is concave, reflecting the rift basin nature, to provide a larger accommodation space for coal accumulation. Ne of the Indo Chinese epoch to the extrusion, control of Jurassic coal formation of syndepositional faults and fault on both sides of the deposition of the coal formation and coal bearing characteristics and development, there was a significant difference in the. Yanshan movement in early and late respectively by ES to the main squeeze, and NNE to the main squeeze, is the main coal controlling structure development period. Early Middle Jurassic in South Qilian Basin mainly braided Braided River Delta and lacustrine sedimentary, Muli Coalfield and trembling stallion area is lake deposit, belonging to the advantageous coal accumulating environment. Thrustfolds for coal control structural study area, F3 downthrown, fold development, coal seam and coal seam thickness is large, the main area of thick coal seam occurrence.
﹀
|
中图分类号: | P618.11 |
开放日期: | 2016-06-16 |