新疆大南湖煤田三号井田煤层气储层物性特征浅析

Analysis of Physical Characteristics of CBM Reservoir in No.3 Mine Field of Dananhu Coalfield

为研究新疆大南湖煤田三号井田煤层气的储层物性特征,本文利用施工取得的地质勘探资料,通过测试煤层真密度和视密度值、显微镜下裂隙分析、等温吸附试验测试等手段,得出:孔隙率大的煤层,利于煤层气储存;裂隙越发育,越不利于煤层气的储存;煤中水分含量高,煤吸附气体量小;在相同瓦斯压力下,煤的变质程度越高,煤吸附的气体量越大。

The purpose of this paper is to study the physical characteristics of coalbed methane(CBM)reservoir in No.3 mine field of Dananhu coalfield,Xinjiang.By testing the real density and apparent density of the coal seam and analyzing fracture under microscope and carrying out isothermal adsorption test,the following conclusion is drawn:the coal seam with large porosity is conducive to CBM storage;fracture development is not favorable to CBM storage;the higher the moisture content in coal,the smaller the amount of gas adsorbed by coal;under the same gas pressure,the higher the degree of coal metamorphism,the larger the amount of gas adsorbed by coal.