第4轮全国煤层气资源评价方法及结果

Methods and results of the fourth round national CBM resources evaluation

随着近10年我国煤层气产业快速发展,为了进一步掌握煤层气资源情况、阐明了我国煤层气资源分布规律,重新对全国30个主要含煤盆地埋深在2 000 m以浅的煤层气资源开展评价工作。第4轮评价继承并更新完善了以往的主要方法和成果,以体积法为主,按照计算单元-区带-盆地的层级顺序开展,将全国煤层气资源按照大区、煤阶、埋深、煤系几方面进行了分类。评价结果表明:全国埋深在2 000 m以浅煤层气地质资源量为29.82×10^(12)m^3,可采资源量为12.51×10^(12)m^3;首次建立了樊庄、三交、保德3个不同煤阶的解剖区,开展类比法评价,进一步落实了含气量、可采系数等关键参数;并且首次评价了埋深在1 500~2 000 m煤层气可采资源量,煤层气资源的最新勘探结果,有助于煤层气勘探开发的快速推进和进一步落实并提高资源等级。

With the rapid development of domestic CBM industry in the past ten years,in order to further grasp the situation of CBM resources,the evaluation work on the shallow CBM resources above 2 000 m of the 30 major coal-bearing basins was re-evaluated.The previous main methods and achievements had inherited and updated during this round of evaluation,mainly based on the volume method,and carried out in the order of the calculation unit-zone-basin hierarchy.The CBM resources in the country was classified in several aspects according to the regions,coal ranks,burial depths,and coal series.The evaluation results showed that the geological resources of shallow CBM above 2 000 m were 29. 82 × 10（12） m3 and the recoverable resources were 12. 51 × 10（12） m3. For the first time,the anatomical areas of Fanzhuang,Sanjiao,and Baode were established,and the analogy method was evaluated to further implement the key parameters such as the gas content and the recoverable coefficient.It was also the first evaluation of the recoverable resources of shallow CBM from 1 500 m to 2 000 m.The study has obtained the latest results of CBM resources in China and clarified the distribution of CBM resources in China.