【摘要】：位于準(zhǔn)噶爾盆地東南緣與北天山北麓、博格達(dá)山的盆-山結(jié)合部位的煤礦主要發(fā)育有下—中侏羅統(tǒng)西山窯組和八道灣組低變質(zhì)煙煤。區(qū)內(nèi)諸多礦井(區(qū))煤巖層、井下水、采空區(qū)及出露溫泉(井)水體中硫化氫富集異常,且硫化氫往往與二氧化碳共存。煤層瓦斯氣體組分以N2、CH4為主,伴有H2S、CO2及C2H6、C3H8等重?zé)N組分,瓦斯氣體組分中硫化氫最高可達(dá)2.11%,對(duì)煤礦工人的職業(yè)健康和安全生產(chǎn)造成嚴(yán)重的影響。區(qū)域煤層埋藏深度大多處于200~900m,地層溫度小于40℃,SRB繁衍激烈,樣品中檢測(cè)值平均為791個(gè)/g樣品。沿徑流方向,地下水礦化度逐漸增高,pH值也逐漸上升,Ca2+濃度逐漸下降,水體富含SO2-4,在充足的有機(jī)質(zhì)及還原環(huán)境中,容易發(fā)生BSR作用,形成硫化氫。區(qū)域各煤層硫化氫豐度普遍小于3.0%,煤的鏡質(zhì)體反射率普遍介于0.50%~0.75%,表明成煤巖階段的古地溫范圍介于80.0~110.0℃,小于120℃,目前煤層埋藏深度普遍處于200~900 m,其地溫小于40℃。大部分煤層甲烷碳同位素值小于-50‰,總體偏輕,CH4具有生物甲烷成因特征。煤層氣中的δ13 CCO值普遍介于2-18.2‰~-11.7‰,表現(xiàn)出有機(jī)成因的特征。綜合判斷區(qū)域各煤礦H2S氣體主要以BSR成因?yàn)橹?不排除部分由于煤層火燒烘烤作用,由TDS或TSR成因產(chǎn)生。
[Abstract]:Located in the southeastern margin of Junggar Basin and the northern foot of North Tianshan Mountain, the coal mines in the basin-mountain combination area of Bogda Mountain mainly develop low metamorphic bituminous coal in the Lower and Middle Jurassic Xishanyao formation and Badaowan formation. In many coal and rock strata, underground water, goaf and exposed hot spring (well) water in this area, the enrichment of hydrogen sulfide is abnormal, and hydrogen sulfide often coexists with carbon dioxide. The gas composition of coal seam is mainly N _ 2H _ 4, accompanied by H _ 2S _ 2 CO _ 2 and C _ 2H _ 6H _ 3H _ 8. Hydrogen sulfide in the gas component can reach 2.11%, which has a serious effect on the occupational health and safety of coal miners. Most of the buried depth of the regional coal seam is 200 ~ 900m, the formation temperature is less than 40 鈩，

本文編號(hào)：2333373