20世纪 70年代后期和 80年代 ,由于煤层气勘探与开发技术的发展和美国联邦政府对煤层气井的税收优惠政策 ,可以称得上是美国煤层气勘探开发的黄金时代。事实上 ,今天 90 %的煤层气生产钻井是在1 988年～ 1 993年间钻成的 ,1 994年煤层气探明储量占美国天然气总储量的 6%。1 992 In the late 1970s and 1980s, due to the development of coalbed methane exploration and development technology and the preferential taxation policies of the federal government for coalbed methane wells, it can be described as the golden age of coalbed methane exploration and development in the United States. In fact, 90% of CBM production wells were drilled between 1988 and 1993, with 1 994 CBM proven reserves accounting for 6% of the total natural gas reserves in the United States. 1 992