【作者】 王可新；

【导师】 傅雪海；

【作者基本信息】 中国矿业大学 ， 地球化学， 2010， 博士

【摘要】 基于低煤级煤在现有技术条件下含气量测试不准的事实,本论文围绕低煤级储层水溶气、吸附气、游离气三相态含气量预测这一关键科学问题,系统地开展了低煤级煤不同温、压条件下的等温吸附实验,揭示了低煤级储层在煤岩组成、含水性、孔隙性、吸附性等有别于中、高煤级储层的特有表现形式;首次开展了低煤级煤层水甲烷溶解度物理模拟,揭示了甲烷在煤层水中的溶解度与温度、压力、矿化度、游离CO2含量的关系,初步探讨了甲烷在煤层水中的溶解机理;基于煤的视密度、真密度、压汞及三轴压缩力学试验,物理模拟了围压下低煤级煤的变形特征;首次构建了储层条件下低煤级储层游离气、吸附气、水溶气的耦合关系及其含量预测的理论与方法。以海拉尔盆地褐煤储层为例,预测了煤层埋深2000m以浅的三相态含气量。本论文为丰富我国煤层气地质理论、开发我国低煤级煤层气资源奠定了基础。更多还原

【Abstract】 As the gas content testing of soluble methane, absorbed methane and free-state methane in low-rank coal seams was inaccurate by present technologies, three states gas content was studied in this thesis. From isothermal adsorption experiment under different temperature and pressure, we discussed the effects of adsorption in low rank coal, and found the specific relation of coal components, moisture and adsorption in low rank coal reservoir, which was differed from middle/high rank coal; based on the first physical simulation of soluble methane in coal seam water, we revealed the relations of temperature, pressure, salinity, free-state CO2 content and solubility and discussed preliminary study of soluble methane mechanism in coal seam water; from the testing data of apparent relative density, true relative density, mercury injection and triaxial compression rock mechanics experiment, we simulated the deformation of low rank coal under stress and discussed mechanical properties of samples; this thesis firstly established the coupling relation of free-state methane, adsorbed methane and soluble methane in low rank coal reservoir, and set up the prediction theory and method of methane volume in low rank coal seam. Case in lignite seam of Hailar Basin, we predicted three states gas volume in coal seams above 2000m depth. This thesis enriched coal bed methane geological theory and established foundation of CBM resource exploration in low rank coal.更多还原