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1993年美国煤层气产量为740Bcf(1cf=0.02832m~3),其中圣胡安盆地产气约605Bcf。该盆地“可造穴带”利用裸眼洞穴完井生产的煤层气占美国煤层气总产量的60％以上(见表1)。目前圣胡安盆地已成为美国最大的能源基地之一。在该盆地勘探中获得的成功经验也可以有效指导其他煤田的勘探工作。 为了探明圣胡安盆地可造穴煤层气储层研究出一种优化勘探法,它以四个基本勘探准则为基础,逐步缩小勘探范围。该方法依据四项基本的勘探准则:(1)镜煤反射率大于O.75％;(2)存在富含煤层气的煤层;(3)有足够大的储层渗透率;(4)确定原生裂隙是否闭合。应用这些标准进行勘探是一个循序渐进、不断加深认识的过程,最终可使勘探范围缩小94％。该勘探方法大大提高了钻井成功率(达到80％),可以推广应用到其他煤田的煤层气勘探研究中。
In 1993, the production of coalbed methane in the United States was 740Bcf (1cf = 0.02832m ~ 3), of which the gas production in the San Juan Basin was about 605Bcf. CBM produced by this “can-made hole zone” using open-hole caves accounts for more than 60% of total coalbed methane production in the United States (Table 1). The San Juan Basin is now one of the largest energy bases in the United States. The successful experience gained in the exploration of the basin can also effectively guide the exploration work in other coalfields. In order to find out that the CBM reservoirs in the Sanzhuo Formation in the San Juan Basin have been developed an optimized exploration method that gradually narrows the exploration area based on the four basic exploration criteria. The method is based on four basic exploration criteria: (1) specular reflectivity greater than 0.75%; (2) presence of CBM-rich coal seams; (3) adequacy of reservoir permeability; (4) Is the native fissure closed? The application of these standards for prospecting is a gradual and deepening process of understanding that eventually narrowed exploration by as much as 94%. The exploration method has greatly improved drilling success rate (up to 80%) and can be widely applied to CBM exploration in other coalfields.