柴达木盆地中生代含煤沉积及煤聚积规律-地质工程专业论文 word格式.docx

山东科技大学硕士学位论文 摘要
摘 要
本文应用煤盆地分析的方法与原理,并结合沉积学、地层学、构造地质学、岩石学、煤质学等分析方法,在综合各种地质资料及前人研究成果的基础上,对柴达木盆地中生界的沉积特征和聚煤规律进行了研究。研究表明柴达木盆地中生代沉积体系包括:冲积扇体系、河流体系、三角洲体系和湖泊体系,并建立了两种沉积模式:下部发育冲积扇
—扇三角洲—湖泊沉积模式,上部发育冲积扇—辫状河—辫状河三角洲—湖泊沉积模式, 揭示了各沉积体系的沉积特征及空间分布规律。最后根据研究区的古植物、古气候、古地理和古构造等控煤因素以及沉积环境的演化,建立扇间—扇前洼地、扇三角洲平原、辫状河冲积平原及湖滨地带聚煤模式,总结了柴达木盆地中生代的聚煤规律。
关键词: 柴达木盆地 中生代 沉积体系 聚煤规律
山东科技大学硕士学位论文 Abstract
Abstract
By the method and principle of the coal basin analysis,bining analysis methods such as sedimentology,stratigraphy,tectonics,petrology,coal quality and sequence stratigraphy,based on all kinds of geologic doeuments and predecessors’researeh fruits,author of this paper have studied systematically on the sedimentary charaeteristics and the law of coal accumulation of Mesozoic in Qaidam Basin. Studies suggest that the depositional system of Mesozoic includes:alluvial fan sedimentary system, stream sedimentary system, delta sedimentary system and lake sedimentary system. Two sedimentary models are established in this paper:Lower is alluvial fan - fan delta – lake sedimentary model,and upper is alluvial fan - braided stream - braided stream fan-lake sedimentary reveals sedimentary charaeteristics and the law of spatial distribution of all kinds of sedimentary systems. It established three coal accumulation models: intersequent-fan depression,fan delta plain,alluvial plain of braided stream and lake it sums up the law of coal accumulation of Mesozoic in Qaidam Basin,based on interrelationship of palaeobotany,palaeoclimate,palaeogeography and palaeotectonics,and evolution of sedimentary environment.
Keywords: Qaidam Basin, Mesozoic, sedimentary system, law of coal accumulation
目 录
1. 绪论.....................................................1
选题依据和意义................................................... 1
研究现状及存在问题............................................... 1
主要内容及方法路线................................................ 6
2. 柴达木盆地区域地质概况.........................