在热液型矿床研究中，流体包裹体是目前我们确定成矿温度和压力等物理化学参数最为有效的工具，其研究主要包括显微测温、激光拉曼等实验研究及状态方程等热力学模拟。由于先前状态方程在气-水-盐体系包裹体应用中的局限性，所以本项目主要致力于宽广温压范围内常见多组分地质流体体系(CH4-C2H6-C3H8-CO2-N2-H2O-NaCl)的体积(PVTx)和气液相平衡(VLE)性质的理论模拟及其在流体包裹体中的应用。首先在实验数据的基础上，建立一个通用的具有良好外延性的Helmhotz自由能状态方程，来预测CH4-C2H6-C3H8-CO2-N2-H2O-NaCl体系的PVTx和VLE性质，然后把新建的状态方程应用到云南三江地区金顶、核桃坪等矿床的流体包裹体研究中：以显微测温和激光拉曼光谱实验数据为基础，计算均一压力、密度和等容线，结合HO同位素分析，进一步获得主成矿期的捕获压力和成矿深度。

In the studies of hydrothermal deposits, fluid inclusion is still a valid tool to determine physiochemical parameters of ores such as trapping temperatures and trapping pressures. The studies include experimental microthermometric and Raman analysis and thermodynamic modeling like equation of state. Because equations of state developed in the past are limited to gas-water-salt fluid inclusions, this project mainly devotes to modeling the PVTx and VLE properties of multi-component geofluids (CH4-C2H6-C3H8-CO2-N2-H2O-NaCl) covering a large temperature-pressure scope, and applies them to fluid inclusion research. In this work, firstly a general equation of state in form of Helmhotz free energy with good extrapolated ability is developed based on experimental data to predict the PVTx and VLE properties of CH4-C2H6-C3H8-CO2-N2-H2O-NaCl system. Then, the newly developed equation of state is applied to the studies of fluid inclusions of Jinding and Hetaoping deposits in Sanjiang region of Yunnan province: Calculating homogenization pressure, density and isochores on the basis of experimental microthermometric and laser Raman data. Trapping pressure and ore-forming depth are further obtained by combining with the HO-isotopic analysis of fluid inclusions.