摘要
查明煤中矿物质在不同温度和CO2分压条件下溶解度变化规律,能为注入CO2过程中煤储层渗透率分析提供重要依据。借助水文地球化学模拟软件PHREEQC对在不同温度和CO2分压条件下煤中各矿物的溶解度进行了水化学模拟,得出不同温度和CO2分压条件下矿物质溶解度的变化规律。结果表明:在无CO2分压时,随着温度的升高各矿物的溶解度增加;当溶液中CO2分压增加到一定程度时,随着温度的升高各矿物的溶解度降低(石英除外);在温度相同时,随着CO2分压的增加,所有矿物(石英除外)溶解度均增加,方解石的溶解度随着CO2分压的升高呈现出迅速增加的趋势,其他矿物随着CO2分压的升高,溶解度增加的速率较为缓慢。
Identification of the variation regularities of solubility of coal minerals under different temperature and CO2 partial pressure can provide an important basis for the analysis of coal reservoir permeability during CO2 in- jection. With the hydrogeochemistry software-PHREEQC, hydrochemical simulation was conducted for the solu- bility of coal minerals under the different temperature and CO2 partial pressure conditions, the variation of coal mineral solubility under different temperature and COs partial pressure was obtained. The results showed that when there was no CO2 partial pressure, the solubility of the minerals increased with the rise of temperature, when CO2 partial pressure of the solution increased to certain extent, the solubility of the minerals except for quartz decreased with the rise of temperature, at the same temperature and with the increase of CO2 partial pressure, the solubility of all minerals except for quartz increased, the solubility of calcite showed rapid increase with the increase of CO2 partial pressure, but other minerals showed slow increase in solubility.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2013年第6期19-21,42,共4页
Coal Geology & Exploration
基金
国家科技重大专项课题(2011ZX05042-003)
关键词
温度
二氧化碳分压
矿物质
溶解度
数值模拟
temperature
carbon dioxide partial pressure
minerals
solubility
numerical simulation
