煤层甲烷的特征与富集

DISCUSSION ON THE CHARACTERISTICS AND ENRICHMENT OF COAL BED METHANE

煤层甲烷是由煤层自生自储的一类非常规天然气。８０％以上呈吸附状态赋在于煤层中。压力是影响煤层甲烷吸附能力的主导因素，对煤层甲烷的勤探应着眼于煤层含气量较高、物性较好的区块。作者提出了评价煤层甲烷开发区的９个条件；同时从煤层的埋藏史阐明了煤层甲烷的富集。

Coal bed methane is a kind of unconventional natural gas generated and gathered in coal beds.More than 80% of the total gas storge exists as a adsorbed phase on the coals.The amount of adsorbed phase mainly depends on the pressure.Exploration for coal bed methane should be undertaken in the area with higher gas contents and better petrophysical property.The author described nine conditions for evaluating exploitation area of coal bed methane and stated the enrichment of coal bed methane in terms of buried history of coal beds.