青海省祁连煤田石炭纪控煤构造及找煤远景区分析  

Analysis of carboniferous coal-controlling structures and prospective areas in Qilian Coalfield,Qinghai Province

作　　者：马小海 李永红 Ma Xiaohai;Li Yonghong(Qinghai Bureau of Coal Geology,Xining 810001,China)

机构地区：[1]青海煤炭地质局,青海西宁810001

出　　处：《能源与环保》2020年第6期63-68,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：中国地质调查局项目(DD20160346)。

摘　　要：石炭纪是青海省第一个成煤时代,在祁连山、柴北缘、唐古拉山等赋煤带均有分布。其中,祁连山赋煤带的祁连煤田晚石炭世羊虎沟组含煤地层分布面积最为广泛,含煤性较好,是青海省无烟煤重要产地,代表性煤矿有宁缠、青羊沟、阿力克、五林沟等。受成煤期后印支—燕山—喜山新构造运动的改造,使祁连煤田现今构造极为复杂,原含煤盆地被切割破坏成若干断块,有些地段被推覆构造掩盖,破坏了煤系及煤层的完整连续性,制约了在该区找煤的突破。为解决这一问题,从梳理总结祁连煤田上石炭统羊虎沟组岩性组合特征入手,通过分析北祁连成煤期后构造改造对煤系、煤层的控制作用,分析了几个典型的控煤构造样式,对找煤标志进行了归纳总结,指出了羊虎沟组在潟湖沉积体系内泥炭沼泽沉积层段含煤性最好,提出峨堡、阿力克深部、野牛台、小八宝等找煤远景区。The Carboniferous is the first coal-forming period in Qinghai Province and is distributed in coal-bearing belts such as Qilian Mountains,Northern Qaidam,Tanggula Mountains.Among them,the Qilian Coalfield in the Qilian coal belt has the most extensive coal-bearing strata in the Late Carboniferous Yanghugou Formation,with good coal-bearing properties.It is an important anthracite producing area in Qinghai Province.Typical coal mines include Ningchan,Qingyanggou,Alec,Wulingou,etc.After the coal formation period,the Indosinian-Yanshan-Xishan new tectonic movement made the Qilian Coalfield′s current structure extremely complicated.The original coal-bearing basin was cut and destroyed into several fault blocks and some areas were covered by the nappe structure,destroying the coal.The system and the complete continuity of the coal seam have restricted the breakthrough in finding coal in the area.To solve this problem,the paper summarizes the lithological assemblage characteristics of the Upper Carboniferous Yanghugou Formation in the Qilian Coalfield.By analyzing the control effect of structural transformation on coal measures and coal seams after the coal formation period in North Qilian,several typical controls are analyzed.The coal structure style,summarized the coal-seeking signs,pointed out that the Yanghugou Formation has the best coal-bearing properties in the peat swamp sedimentary layer of the lagoon sedimentary system,proposed coal prospecting areas such as Ebao,Alec deep,Yeniutai and Xiaobabao.

关 键 词：祁连煤田 晚石炭纪 控煤构造 找煤远景区 

分 类 号：P618.11[天文地球—矿床学]