摘要
对彬长矿区水文地质特征进行了详细的论述,结合煤层实测含气性特征,探讨了水文地质条件对该区煤层气成藏的控制作用。研究表明:研究区构造简单,延安组煤系含水层与其他含水层不具明显水力联系,有利于煤层气富集成藏,同时使得煤系含水层地下水补给只能来源于区外侧向径流补给;矿区划分为3个水动力强弱不同的区域:侧向径流补给区、弱径流区和相对滞流区,其中位于矿区东南部的相对滞流区,也是水势低洼带煤层气汇集区,有利于煤层的富集成藏。同时,东南部煤层的含气量最高,说明该区水文地质条件确实对煤层气成藏起着关键作用。
Hydrogeological conditions are critical factors of coalbed methane accumulation,which play an impor-tant role in the migration and conservation of coalbed methane.This paper took a detailed discussion on the hy-drogeological characteristics in Binchang mining area.Combined with the characteristics of measured gas content,the methane enrichment controlled by hydrogeological conditions in the area was studied.The results show that the structure of the study area is simple and there＇s no significant hydrodynamic contact between the aquifer in coal measure of Yan＇an Formation and other aquifers,which is favorable to the accumulation of coalbed methane,and the groundwater replenishment of the coal strata can only come from the lateral provision of areas outside the study area.According to the hydrodynamic intensity the study area is divided into three parts： lateral runoff recharge area,runoff area and the relative stagnation area.The relative stagnation area located in the southeastern area is also the low-lying area of potential hydro-energy,which is favorable to the accumulation of coalbed methane.Meanwhile,the gas content of the southeastern coal bed is the highest,which indicates that hydrogeological conditions do play a key role in coalbed methane reservoirs.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2012年第1期43-46,共4页
Coal Geology & Exploration
基金
国家科技重大专项课题(2008ZX05034-001)
油气沉积地质教育部创新团队项目(IRT0864)
关键词
彬长矿区
煤层气
水文地质
成藏
控气
Binchang sector
coalbed methane
hydrogeology
reservoir
control gas
