地质流体状态方程的高温高压实验研究

状态方程是最为重要的热力学模型，对预测深部地质流体的物理化学性质具有极其重要的意义，是解决流体成分参与的相平衡与化学反应平衡问题的关键。然而地质流体在高压特别是地幔压力条件下的热力学实验数据极度缺乏，很难为判断状态方程的准确性提供足够的数据去验证。本项目拟在大腔体压机和超声脉冲反射法的基础上，以NaCl-H2O-CO2体系为研究对象,在300K到800K，0.5GPa-4.5GPa的温度压力范围内开展声速测量研究，由此确定体系的PVTx关系，进而可以对各种状态方程的准确性进行验证。本项目的研究可以极大的丰富高温高压下地质流体的热力学数据，提升人们对地幔流体物理化学性质的认识，推动高准确度和高可靠性状态方程的发展。

Equation of state is the most important thermodynamic model. It is of great importance to predict the physical and chemical properties of deep geological fluids, and is the key to solve the problem of phase equilibrium and chemical reaction equilibrium. However, the thermodynamic data of geological fluids under high pressure, especially the pressure of upper mantle, are extremely scarce, so it is difficult to provide enough data to verify the accuracy of the equation of state. This project is based on large volume press and ultrasonic pulse-echo method, with NaCl-H2O-CO2 system as the research object, in the range of 300K-800K and 0.5GPa-4.5GPa, to carry out the acoustic velocity measurement, so as to determine the PVTx relation, and to verify equation of state finally. This project can greatly enrich the thermodynamic data of geological fluids under high temperature and high pressure, enhance people's understanding of the physical and chemical properties of mantle fluids, and promote the development of equation of state with higher accuracy and higher reliability.