不同矿化度水对煤层气解吸-扩散影响的实验  

Experimental study on the effect of salinity on coalbed methane desorption-diffusion

作　　者：伊向艺[1,2] 吴红军[2] 卢渊[2] 邱小龙[3] 张浩[2] 李成勇 

机构地区：[1]油气藏地质及开发工程国家重点实验室,成都理工大学,四川成都610059 [2]成都理工大学能源学院,四川成都610059 [3]贵州省地质矿产勘查开发局113地质大队,贵州六盘水553001

出　　处：《煤田地质与勘探》2013年第5期33-35,共3页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2011ZX05037-003);教育部博士学科点新教师类基金(20095122120012);博导基金(20125122110017)

摘　　要：煤层气主要以吸附状态赋存于煤层的割理和基质孔隙中。以沁水盆地寺河煤矿3号煤粉碎后的割理颗粒为实验样品,通过对样品注入蒸馏水、水源水和地层水3种不同矿化度水的解吸实验,探讨了不同矿化度水对煤层甲烷解吸扩散过程的影响情况。结果表明:3种水的初始解吸压力约为1.4 MPa,且解吸过程主要集中在后期,而前期解吸量不足总解吸量的30%;含有矿化度的水源水和地层水比无矿化度蒸馏水的解吸率、恢复率和初始解吸压力都低,且随着水矿化度的增大,解吸率和恢复率都略有减小。Coalbed methane occurs mainly as adsorbed state in the cleat and matrix pores of the coal. To study the effect of liquids with different salinity on methane desorption-diffusion process, crushed coal particles of seam 3 from Sihe mine were selected as test samples to conduct desorption test after injecting 3 liquids of different salinity into the samples. The results show that all the initial desorption pressure is close to 1.4 MPa, the desorption rate, and early desorption amount are less than 30% of the total amount of desorption, mainly concentrated in late de-sorption, recovery rate and the initial desorption pressure of source water and formation water are lower than those of the distilled water, and with fluid salinity increase, the desoption rates and recovery rates are slightly reduced.

关 键 词：矿化度 煤层气 解吸-扩散 解吸率 恢复率 

分 类 号：P618.11[天文地球—矿床学]