准噶尔盆地东南缘煤矿硫化氢气体成因研究
发布时间：2018-11-15 12:59
【摘要】：位于准噶尔盆地东南缘与北天山北麓、博格达山的盆-山结合部位的煤矿主要发育有下—中侏罗统西山窑组和八道湾组低变质烟煤。区内诸多矿井(区)煤岩层、井下水、采空区及出露温泉(井)水体中硫化氢富集异常,且硫化氢往往与二氧化碳共存。煤层瓦斯气体组分以N2、CH4为主,伴有H2S、CO2及C2H6、C3H8等重烃组分,瓦斯气体组分中硫化氢最高可达2.11%,对煤矿工人的职业健康和安全生产造成严重的影响。区域煤层埋藏深度大多处于200~900m,地层温度小于40℃,SRB繁衍激烈,样品中检测值平均为791个/g样品。沿径流方向,地下水矿化度逐渐增高,pH值也逐渐上升,Ca2+浓度逐渐下降,水体富含SO2-4,在充足的有机质及还原环境中,容易发生BSR作用,形成硫化氢。区域各煤层硫化氢丰度普遍小于3.0%,煤的镜质体反射率普遍介于0.50%~0.75%,表明成煤岩阶段的古地温范围介于80.0~110.0℃,小于120℃,目前煤层埋藏深度普遍处于200~900 m,其地温小于40℃。大部分煤层甲烷碳同位素值小于-50‰,总体偏轻,CH4具有生物甲烷成因特征。煤层气中的δ13 CCO值普遍介于2-18.2‰~-11.7‰,表现出有机成因的特征。综合判断区域各煤矿H2S气体主要以BSR成因为主,不排除部分由于煤层火烧烘烤作用,由TDS或TSR成因产生。
[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，
本文编号：2333373
[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，
本文编号：2333373
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