内蒙古东部低煤阶含煤盆地群的煤层气勘探前景

在研究具有煤阶低、煤层含气量低、含气饱和度高、煤层厚度大和资源丰度大特点的美国粉河、尤因塔盆地的煤层气成功勘探经验基础上,重新认识了我国内蒙古东部低煤阶含煤盆地群的煤层气资源潜力。指出晚侏罗世-早白垩世是我国内蒙古东部重要的聚煤期,且热演化程度低、煤阶低、含气量普遍不高,但地层厚度大、煤层厚度大,资源丰度高,初步预测煤层气资源量超过2万亿m3。认为在内蒙古东部低煤阶含煤盆地开展煤层气勘探,必须加强保存条件研究,加强高含气饱和度地区预测研究,重视二次生物成因气和加强盆地的水动力因素的研究,才能有所突破。

EXPLORING FOREGROUND OF LOW RANK COAL BASINS IN EASTERN INNER MONGOLIA OF CHINA

Recently, commercial coalbed methane production rate has gotten in the Tertiary Powder River basin in USA, which had. lower coal rank and lower gas content, but has higher coal thickness and gas abundance; this made us beginning to considering coalbed methane resource in the lower coal rank basin of eastern Inner Mongolia. Tertiary and Cretaceous coal with a resource of 2 trillion cubic meters was the most important coal accumulated period, which has a thick coal seam, lower coal rank, lower gas content. Through the analysis of Northeast China, we could found that it is important to reinforce study on coalbed methane preservation condition, study on forecasting of high permeable and gas-riched area, secondary biogenesis gas and hydraulic conditions.