青海东昆仑埃坑德勒斯特勘查区含煤岩系沉积环境分析

Coal-bearing Strata Sedimentary Environment Analysis in Ekendrest Exploration Area, Eastern Kunlun, Qinghai

青海东昆仑埃坑德勒斯特勘查区位于东昆中与东昆南断裂之间,属于东昆仑中部阿拉克湖断陷带。根据野外地质调查及室内综合分析,得出本区含煤地层主要为晚三叠世八宝山组和早侏罗世羊曲组,其中八宝山组属水面上升—下降期沉积体系,发育一套曲流河一湖相三角洲一曲流河含煤沉积序列,羊曲组发育了一套河流—湖沼相的碎屑岩夹炭质页岩及煤层的沉积序列;羊曲组成煤条件优于八宝山组。该研究对埃坑德勒斯特地区的找煤工作具有指导意义。

The Ekendrest Exploration Area, Eastern Kunlun, Qinghai is situated between the eastern Kunlun central and south faults, a part of LakeArak fault depression zone. Based on field geological investigation and indoor comprehensive analysis, considered that the coal-bearing strata in the area are mainly late Triassic Babaoshan Formation and early Jurassic Yangqu Formation. In which, Ba- baoshan Formation belongs to water level rising--falling stage sedimentary system, developed a set of meandering river^-lake delta-- meandering river coal-bearing sedimentary sequence; Yangqu Formation developed a set of fluvial--lacustrine bog facies clastic rock intercalated with carbonaceous shale and coal seam sedimentary sequence; coal-forming condition of the later is better than the former. The research has guiding significance to coal prospecting in the Ekendrest area.