差异成因无烟煤储层煤层气解吸实验研究

CBM desorption experiment of differences anthracite reservoir

对深成变质作用与岩浆变质作用无烟煤物质构成、孔隙发育、比表面积、吸附/解吸对比实验,分析认为,孔隙比例(小孔及以下占96%)是深成变质与岩浆热变质成因的判定标志之一;煤层气解吸率取决于解吸热与吸附热的差值,储层温度在298.15K时,排水降压适合于深成变质无烟煤煤层气解吸的能耗,解吸率高达66%,排水—降压—解吸的排采模式适应于晋城寺河地区煤层气的开发;温度增加5 K,宁夏汝箕沟地区煤层气解吸率提高9%,温度增加10 K,冷水江塘冲地区煤层气解吸率提高12%.温度增加过多,对煤层气解吸率的影响不显著。升温解吸在煤层气开发中作用应受到重视。

Comparative experiment on the metamorphism and magmatic metamorphism of anthracite reservoir material, porosity development, surface area, adsorption/desorption is carried out. Analysis shows that porosity ratio （holes above 96% ） is one of the hallmarks to determine the anthracite metamorphic origin of plutonic metamorphism and magmatic metamorphic, CBM desorption rate depends on the difference between the solution of the endothermic heat of adsorption. Reservoir temperature at 298. 15 K, drainage and buck suitable for CBM desorption energy consumption of plutonic metamorphic anthracite reservoir, desorption rate as high as 66%. Drainage-buck-desorption exclusive mining model dapted to the CBM development in Sihe coalmine of Jincheng city; Temperature increase in the 5 K, Rujigou coalmine of Ningxia province anthracite reservoir CBM desorption rate increased by 9%, Temperature increases in the 10 K, Tangchong of Lengshuijiang city coalmine anthracite reservoir CBM desorption rate increased by 12%, Temperature increases too much, no significant effect on the desorption rate. Warming desorption should be taken seriously on CBM development.