六盘水煤田盘关向斜煤层气赋存规律.pdf

六盘水煤田盘关向斜煤层气赋存规律六盘水煤田盘关向斜煤层气赋存规律易同生(贵州省媒田地质局贵阳550006) 摘要煤层气赋存规律是煤层气地质选区评价的重要依据。以太量煤田勘探成果和矿井瓦斯地质资料为基础,讨论了盘关向斜煤层气赋存分带、构造赋存、岩性赋存、深度赋存、煤体赋存等。研究认为:盘关向斜煤层气赋存分带以CH。带为主,甲烷风化带平均下限深度为150re;向斜转折端或次一级褶曲的部位煤层气相对富集,平缓翼较陡翼煤层台气量太;煤层问发育的硒气层和蝶层阀岩性的砂(友) 岩比例影响蝶层舍气量;煤层甲烷含量随煤中镜质体含量的增加而增加,随壳质体舍量增加而下降;煤层甲烷台量随煤层埋深的增加而增大。随灰分的增加而降低;水文地质每件和煤犀对煤层甲烷鲁量的影响甚微。关键词煤层气赋存盘关向斜 Existence Laws ofCBM atPanguan Syncline of Liupanshui Coalfield YiTongsheng (Guizhou coalfieldgeology Bureau,GuiyanO 550006) Abstract:The study exlstence laws0fCBbl important basisf叽8eleetion offavorable areas ofCBM. Based on thelarge amount ofcoalfieldexploration resultsand geologicol information ofcoalgas,the author discussed thattheCBM distribntioazon%。structure features,lithology,target depth and coalseⅢat Panguan wsearch showed thattheCBM existence belts are mainly om”p08ed ofc巩belts and theaverage minimum depth ofCH,weathering FOLIO 150m;CBM relatively rich theturning endofsyneline orseeondary foldand gas content flank ofsyncline high口than that steep 0fgassealinglayer andtheratioofsandstone tolimestone incoal$ealll$is thefactor toinfluence gas content increases withtheincrease ofvitrinite content ∞gas content decreaseswiththeincreaseof exiniteand ash content effectsofhydrogeological conditions andthickness 0fcoal o”gas content very Keywords:CBM;existence laws;P