用下降曲线估算废弃矿井煤层气资源量

国外的最新研究成果,认为废弃矿井的甲烷涌出速度对时间的曲线是一条双曲线,而通过对西安分院大量的煤层气钻孔煤心样的解吸数据的分析,发现甲烷的解吸速度与时间的曲线也是一条双曲线.用钻孔煤心现场解吸数据可以近似得到废弃矿井甲烷涌出速度对时间的下降曲线.对废弃矿井甲烷涌出速度对时间的曲线按时间积分到无穷大,可以得到计算时刻的废弃矿井资源量.

Estimation of Abandoned Mine CBM Resources through Drop-Down Curves

According to abroad findings down to date, the curve of methane emission rate versus time is a hyperbola. But through analyses of large quantity CBM drilling sampled coal core desorption data by the Xian Branch, have found that the curve of methane desorption rate versus time is also a hyperbola. To use the drilled coal core site desorption data can get a drop-down curve of abandoned mine methane emission rate versus time approximately. To integrate the curve of abandoned mine methane emission rate versus time to infinity against time, can get abandoned mine CBM resources at the time of estimating.