煤层气成藏地层水化学特征研究

Formation Water Chemical Characteristics of Coalbed Methane (CBM) Reservoir Formation

我国煤层气资源中高煤阶和低煤阶的煤层气资源相当可观,但高、低煤阶的煤层气成藏的地层水地球化学特征存在着一定的差异,这间接地制约着我国煤层气产业化的进程。本文结合低煤阶煤层气成藏的水化学场物理模拟实验,对高、低煤阶煤层气成藏的水地球化学特征进行了对比分析。研究认为高矿化度有利于高煤阶煤层气富集成藏,低矿化度是低煤阶煤层气的富集成藏的有利条件。

CBM resource was enough in China, which included the low rank and high rank CBM reservoirs. Both were important, but the chemical characteristics of formation water of high-low rank CBM reservoirs were different. It constrains the progress of physical simulation of low rank CBM reservoirs, the geochemistry characteristics of the high-low rank CBM reservoirs are compared and discussed. It is proved that the high salinity is the advantageous factor for the high rank CBM reservoir enrichment and formation, while the salinity of low rank CBM reservoir is beneficial for the enrichment and formation of low rank CBM reservoirs.