中小型含煤盆地煤层气勘探取得突破的几点认识

中国中小型含煤盆地种类众多,煤层气资源巨大,中国石油天然气股份有限公司对一些盆地的煤层气勘探已经取得了突破。对高、中、低3种煤阶类型的中小型含煤盆地已取得的成果进行了分析总结,提出了不同类型的中小型含煤盆地所特有的煤层气富集成藏理论,分析了沁水盆地高煤阶煤层气田、宁武盆地中煤阶含气区和沙尔湖盆地低煤阶含气区的煤层气地质特点和成藏条件,并对以上理论进行了验证。最后分析了中小型含煤盆地煤层气今后的勘探方向。

SEVERAL KNOWLEDGE TO COAL BED METHANE EXPLORATION BREAKTHOUGH IN MIDDLE AND SMALL TYPE OF COAL-BEARING BASINS

There are many middle and small types of basin in China with abundant coal bed methane resource, PetroChina has made breakthough of coal bed methane exploration in some basins. This paper summarizes the result from coal bed methane exploration in middle and small types of basin with high coal rank, middle coal rank and low coal rank, and puts forward special theories of coal bed methane accumulation and forming-pool in different middle and small types of basins. Author also analyzes coal bed methane geological characteristics and forming-pool conditions in high coal rank coal bed methane field of Qinshui basin, middle coal rank gas-bearing area of Ningwu basin and low coal rank gas-bearing area of Shaerhu basin. The research testes and verifies these theories mentioned above. In the end, this paper points out the coal bed methane exploring direction in middle and small types of basins in the future.