中国煤层气资源分布特征及勘探研究建议

Distribution characteristics of coalbed methane resources in China and recommendations for exploration research

为了更好地推动中国煤层气产业快速发展,更准确地把握勘探开发战略方向,针对煤层气资源分布特征、分布规律及勘探开发方向不清的问题,开展了中国煤层气资源时空地三维分布特征研究工作。结果表明1)华北气区煤层气地质资源量及产量位居全国五大气区首位;煤层气资源最丰富的山西省建成了2个储量1000×108 m^(3)的煤层气产业示范基地;贵州省将成为中国煤层气勘探生产重要接替区。2)地震勘探难度相对较大的黄土塬、丘陵和山地是中国煤层气集中分布地。3)地质资源量1×10^(12) m^(3)以上的含煤层气盆地有10个,地质资源总量占全国的85.02%,可采资源总量占全国的87.61%;鄂尔多斯盆地、沁水盆地和滇东黔西盆地的煤层气地质及可采资源量均位列前三甲,而资源丰度排前三甲的是塔里木盆地、滇东黔西盆地及准噶尔盆地。4)深层煤层气资源量占比较多,浅层与中层资源量共占60%;华北、西北及南方气区煤层气主要发育于浅层。5)中、古生界是煤层气最为富集的地层,可采资源量分别为6.72×10^(12) m^(3)和5.76×10^(12) m^(3),占全国的53.8%和46.1%。6)高、中煤阶煤层气主要分布在华北和南方气区;低煤阶煤层气主要分布在西北和东北气区;这三者可采资源量约各占1/3。以上成果认识为制定我国煤层气勘探开发战略提供了有利的技术支撑。

In order to better promote the rapid development of Chinese coalbed methane industry and better grasp the strategic direction of exploration and development,in light of uncertain distribution characteristics,pattern of coalbed methane resources and unclear direction of exploration and development,and the research work of three-dimensional distribution of coalbed methane resources in China was carried out.The results show that:1)North China gas area is the largest coalbed methane geological resource and production in the five gas areas of the country;Shanxi Province,which has the largest coalbed methane resource,has completed two demonstration bases for the coalbed methane industry with 1000×108 m^(3) reserves;Guizhou Province will become an important replacement area for coalbed methane exploration and production in China.2)Loess tableland,hills and mountains,which are relatively difficult to do seismic exploration,are the areas where coalbed methane is concentrated in China.3)There are ten coalbed methane basins with more than 1×10^(12) m^(3) geological resources,with total geology and recoverable resources accounting for 85.02%and 87.61%of the country,respectively;Ordos,Qinshui,and Diandong Qianxi Basin of the average coalbed methane geology and recoverable resources in the rank among the top three.The first three-a basin with resource abundance of coalbed methane is Tarim,Diandong Qianxi and Junggar Basin.4)Deep-seated coalbed methane resources account for the largest share,with shallow and mid-level resources accounting for 60%.Coalbed methane resources in North China,Northwest,and South China is mainly developed in shallow.5)Mesozoic and Palaeozoic are the richest formations of coalbed methane,and the recoverable resources are 6.72×10^(12) m^(3),5.76×10^(12) m^(3),respectively,accounting for 53.8%and 46.1%of the country.6)The high and medium-grade coalbed methane are mainly distributed in the gas areas of North China and South China;The low-grade coalbed methane are mainly distributed in the gas areas of the northwest and the northeast;and the recoverable resources of the three kind of coalbed methane are roughly one-third.The above recognition of achievements has provided favorable technical support for formulating China’s coalbed methane exploration and development strategy.