新一轮全国煤层气资源评价方法与结果

Methodologies and results of the latest assessment of coalbed methane resources in China

新一轮的全国煤层气资源评价是迄今为止评价规模最大、范围最广、资源系列最全的一次,其成果已经得到了广泛应用。为此,详细介绍了新一轮全国煤层气资源评价采用的方法,并与我国历次煤层气资源评价进行了对比。新一轮全国煤层气资源评价采用了以体积法为主的评价方法体系,以煤层含气量、可采系数、煤层气资源类别评价标准等为关键评价参数,系统评价了全国42个主要含煤层气盆地(群)、121个含气区带的煤层气资源。评价结果表明:全国埋深2000m以浅煤层气地质资源量为36.81×1012m3,可采资源量为10.87×1012m3;煤层气资源集中分布在鄂尔多斯、沁水、准噶尔等大型盆地,在层系、深度和地理环境的分布上具有很强的不均衡性,资源品质较好,以Ⅰ、Ⅱ类为主。

The latest nationwide assessment of coal-bed methane resources is the largest in size and the most complete in resource series,and the assessment results have been widely applied.The methodologies are introduced in detail and compared with that applied in previous assessments of coal-bed methane resources in China.The latest round of coal-bed resources assessment used a method system dominated by volumetric method and various key evaluation parameters including coal-bed methane content,recovery factors,and standards for classification and evaluation of coal-bed methane.A total of 42 major basins(basin groups)containing coal-bed methane and 121 gas-bearing zones methane plays were systematically assessed.The results show that the original coal-bed methane in-place is 36.81 tcm in the coal layers with a burial depth of less than 2000 m,of which 10.87 tcm is ultimately recoverable.The coal-bed methane resources are concentrated in large basins such as Ordos,Qinshui and Junggar.Their distribution in layer series,depth and geographic environment is highly uneven.The resources volume is large and is dominated by type Ⅰand Ⅱ.