中国煤层气聚集区带划分

DIVISION OF COAL BED GAS ACCUMULATION REGIONS AND ZONES IN CHINA

１９９５ ～１９９８ 年间，中国煤田地质总局进行了新的全国煤层气资源评价工作。结合该次研究评价结果，综合考虑构造、聚煤期、煤层含气性及地域分布等四方面因素，将中国煤层气聚集区带划分为聚气区、聚气带、目标区三级，共包括５ 个聚气区、３０ 个聚气带和１１５ 个目标区；同时，采用评价面积和资源丰度两个指标，对聚气带和目标区的类型进行了研究，将聚气带划分为３ 类８ 型，目标区归纳为３ 类９ 型。研究表明：中国煤层气的有利聚气带和目标区主要分布在华北聚气区和华南聚气区；华北聚气区以大、中型含气目标区为主，富气目标区的数量也较多；东北聚气区以中—小型含气和富气目标区为主，有大型含气区分布；西北聚气区全由小型目标区构成，但富气目标区相对较多；华南聚气区内目标区类型构成较为均衡，主要为中—小型目标区，低气目标区数量极多，大型目标区全部位于其西部的川南—黔北和滇东—黔西聚气带，而大型富气区仅在滇东—黔西聚气带有所分布。

A new national coal bed gas resources evaluation was carried out by the China National Administration of Coal Geology from 1995 to 1998.Based on the evaluation,three grades as coal bed gas accumulation region,zone and target area are divided by comprehensively considering the four factors such as tectonic conditions,coal forming period,coal bed's gas potential and regional distribution,including 5 regions,30 zones and 115 target areas.Meanwhile,the types of the coal bed gas accumulation zones and target areas are studied in light of two indexes,i.e.the area and resource abundance of the evaluated unite,the gas accumulation zones being divided into three categories and eight types and the target areas into three categories and nine types.The investigation shows that the potential regions and target areas occur mainly in the North China and South China gas accumulation regions.There are mainly the large and medium scale gas bearing target areas with many rich in gas ones in the North China gas accumulation region and the medium and small scale gas bearing and rich in gas target areas with some large scale gas bearing ones in the Northeast China gas accumulation region.In the Northwest China gas accumulation region there are all the small scale target areas with relatively more rich in gas ones.In the South China gas accumulation region,there are mainly the medium and small scale target areas with much more poor in gas ones,the large scale target areas are all located in the South Sichuan North Guizhou and East Yunnan West Guizhou gas accumulation zones,and the large scale rich in gas target areas occur in the East Yunnan West Guizhou gas accumulation zone only.