阜康矿区煤储层水溶气含量模拟与水文地质控气研究

发布时间：2018-02-27 19:03

本文关键词： 煤层气水溶气溶解度覆压下孔隙度水文地质控气阜康矿区　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：为了评价阜康矿区煤储层水溶气含量的,研究了不同温度、压力、矿化度、煤层气成分组成、储层水离子类型条件下煤层气溶解度的变化规律;基于气体在电解质溶液中的溶解机理,对比分析了气体溶解度的计算方法,分别建立了0~3MPa CO2、CH4、N2溶解度计算模型和3~30MPa CH4溶解度计算模型;在此基础之上,建立了不同温度、压力、矿化度、不同气体成分组成条件下,煤层气溶解度的解析计算模型,模型计算的煤层气溶解度与实测的煤层气在煤储层水中的溶解度相对误差小于4%;对阜康矿区煤样进行了覆压下孔隙度的物理模拟,探讨了阜康矿区煤储层孔隙度与有效应力之间的关系,建立了煤储层孔隙度与有效应力之间的计算模型,提出了利用常压下所测得的煤储层孔隙度推算原位煤储层孔隙度的数值模拟方法;在煤储层孔隙度和煤层气溶解度数值模拟的基础上,建立了煤储层水溶气含量的数值模拟方法,估算出阜康矿区八道湾组45号煤煤层水溶气含量介于0.043~0.063m3/t之间,45号煤煤储层水溶气含量随埋深先增大后减小,在埋深800~900m处,水溶气含量最大。探讨了水文地质条件对煤储层风氧化带边界深度、煤储层含气性以及储层压力的影响,认为水力封堵控气作用对阜康矿区煤储层含气性起主要控制作用。
[Abstract]:In order to evaluate the water soluble gas content of coal reservoir in Fukang mining area, the variation law of coal bed methane solubility under different temperature, pressure, mineralization degree, composition of coal bed gas and reservoir water ion type is studied. Based on the dissolution mechanism of gas in electrolyte solution, the calculation methods of gas solubility are compared and analyzed, and the models for calculating the solubility of 0 ~ 3MPa CO _ 2CO _ 2H _ 4H _ 4N _ 2 and 3N _ 3MPa CH4 are established, respectively, on the basis of which, different temperatures and pressures are established. The analytical calculation model of the solubility of coalbed methane under the conditions of different composition of gases, The relative error between the calculated solubility of CBM and the measured solubility of CBM in coal reservoir water is less than 4. The porosity of coal samples in Fukang mining area is simulated under overpressure. The relationship between porosity and effective stress of coal reservoir in Fukang mining area is discussed, and the calculation model between porosity and effective stress of coal reservoir is established. A numerical simulation method for calculating the porosity of in-situ coal reservoir based on the porosity of coal reservoir and the solubility of coalbed methane is presented, based on the numerical simulation of porosity of coal reservoir under normal pressure. A numerical simulation method of water soluble gas content in coal reservoir is established. It is estimated that the water dissolved gas content in coal seam No. 45 of Badaowan formation in Fukang mining area is between 0.043 and 0.063 m3 / t. The water dissolved gas content in coal reservoir No. 45 increases first and then decreases with burial depth of 800 ~ 900m. The effect of hydrogeological conditions on the boundary depth of wind oxidation zone, gas content and reservoir pressure of coal reservoir is discussed. It is considered that hydraulic plugging and controlling gas action play a major role in controlling the gas content of coal reservoir in Fukang mining area.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【参考文献】