摘要
山西陵川地区上石炭统-下二叠统太原组K1段出露良好,其顶部的15#煤层为沁水盆地石炭二叠系煤田主采煤层之一。通过对K1段岩性、沉积构造、沉积序列、植物化石及煤岩组分等特征的综合分析,将该段划分为潟湖、障壁岛、潮坪、溢流扇等4种沉积相以及混合坪、泥坪、泥炭坪等3种沉积亚相。结合15#煤层沉积背景及煤岩特征,认为本区15#煤层是在海退导致潮坪暴露形成古土壤之后所产生的低位泥炭沼泽的基础上形成的,它结束于之后的一次快速的、更大规模的海侵。在综合研究成煤地质背景的基础上,提出研究区15#煤层属于滨岸潮坪成煤模式。这一成果为今后山西沁水盆地东南部该煤层的深层勘探开发及煤层气的生成地质背景提供了基础理论资料。
The member K1 of the upper Carboniferous-lower Permian Taiyuan Formation is well outcropped in the Lingchuan area,Shanxi.The coal No.15 in the top part of member K1 is one of main mineable coal seams of Permian-Carboniferous coalfield in the Qinshui Basin.After comprehensively analyzed characteristics of lithology,sedimentary structure,sedimentary sequence,plant fossils and lithotype of member K1,divided the member into lagoon,barrier island,tidal flat and washover fan 4 sedimentary facies and mixed flat,mudflat and peat flat 3 subfacies.Combined with sedimentary settings and coal petrological characteristics,considered that the coal No.15 in the area was formed on a low-level peat bog basis after a marine regression caused exposure of tidal flat and formed paleosol,and end up with a subsequent rapid,larger scale marine transgression.Based on the coal-forming background comprehensive study,a coastal tidal flat coal-forming pattern of coal No.15 put forward.The result has provided a basic theory for coal No.15 deep part exploration and exploitation,as well as CBM generation geological background in southeastern Qinshui Basin,Shanxi.
出处
《中国煤炭地质》
2013年第2期4-11,31,共9页
Coal Geology of China
基金
国家自然科学基金项目--华北下二叠统太原组动藻迹(Zoophycos)遗迹组合
遗迹组构及其沉积环境研究(41102002)资助
关键词
沁水盆地
太原组
煤田地质
成煤环境
Qinshui Basin
Taiyuan Formation
coal geology
coal-forming environment
