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通过压力下黄金管封闭体系热模拟实验,获取了民和盆地侏罗系煤系有机质各演化阶段的流体组成后,结合软件PVT-sim中的CS黏度计算模型对煤成烃的黏度演化进行了计算,并着重讨论了煤系有机质产生的CO2对煤成烃黏度的影响。研究表明烃类流体黏度与其相态密切相关,地质条件下液相黏度要较伴生的气相黏度高出一个数量级。随着演化程度的上升,煤成烃的气液黏度都在逐渐降低。压力为10~30MPa,温度为25~125℃条件下,Easy%RO值达到0.86%以后液相黏度小于1.0mPa·s,最低可以下降至0.13mPa·s,气相黏度在不考虑近临界态时,最大黏度不超过0.1mPa·s,最低可低至0.013mPa·s。煤系有机质演化过程中产生的CO2含量变化对煤成烃黏度的影响也十分重要,不同温压条件下,受到气液两相中CO2分配比例不同的影响,气液两相的黏度呈规律性变化。总体表现为,气相和液相的黏度均随着总组分中CO2含量的降低而降低,CO2对液态烃中短碳链组分的萃取作用是造成上述变化的根本原因,在低温情况或低演化阶段会出现黏度随着CO2减少而上升的现象。
Through the thermal simulation experiment of the closed tube system of gold tube under pressure, the fluid composition of Jurassic coal measures of organic evolution in Minhe Basin was obtained. Based on the CS viscosity calculation model in PVT-sim software, the evolution of viscosity of coal into hydrocarbon was carried out Calculated and focused on the impact of CO2 from coal-based organic matter on the viscosity of coal. The research shows that the viscosity of hydrocarbon fluid is closely related to its phase state, and the viscosity of liquid phase under geological conditions is one order of magnitude higher than the associated gas phase viscosity. As the degree of evolution increases, the gas-liquid viscosity of coal-formed hydrocarbons gradually decreases. Under the condition of pressure of 10 ~ 30MPa and temperature of 25 ~ 125 ℃, the liquid viscosity is less than 1.0mPa · s after Easy% RO reaches 0.86%, and the minimum can decrease to 0.13mPa · s. , The maximum viscosity of not more than 0.1mPa · s, the lowest as low as 0.013mPa · s. The evolution of coal-based organic matter during the evolution of CO2 content on the viscosity of coal hydrocarbon formation is also very important, under different temperature and pressure conditions, by the gas-liquid two-phase distribution of CO2 in different proportions of the gas-liquid two phase viscosity was regular Variety. Overall, the viscosity of the gas phase and the liquid phase both decrease with the decrease of the CO2 content in the total components. The extraction of short carbon chain components in the liquid hydrocarbon is the fundamental reason for the above changes. Under low temperature or low The evolution phase will appear viscosity increases with CO2 reduction and the phenomenon.