迭代法计算H_2O-CO_2-NaCl包裹体均一压力的改进及其应用  

Improvements and application of iterative method for calculating homogenization pressure of H_2O-CO_2-NaCl inclusion system

作　　者：席斌斌[1] 施伟军[1] 张德会[2] 徐文刚[2] 蒋宏[1] 王成[3] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214151 [2]中国地质大学地球科学与资源学院,北京100083 [3]南京大学地球科学与工程学院,江苏南京210093

出　　处：《矿床地质》2010年第6期1138-1144,共7页Mineral Deposits

基　　金：中国石油化工股份有限公司科技部项目(P06002)资助

摘　　要：文章在宋玉财等于2007年提出的利用迭代法计算流体包裹体成分及均一压力的基础上,结合Duan等通过热力学模拟研究所获得的最新的热力学方程及H2O-CO2-NaCl包裹体pVtx计算程序,对宋玉财等所提出的H2O-CO2-NaCl包裹体成分及均一压力的迭代计算法提出了改进意见,同时对其进行了适当的修改。文章利用中-低温条件下求解CO2在盐水中的溶解度及摩尔体积的方程,提高了原方法的计算精度,并将原方法的适用范围(均一温度≥300℃)扩展到中-低温(0～260℃)、中-低压力(0～1000×105Pa)以及中等盐度的范围。本方法适用于求解CO部分均一温度高于笼形物融化温度、不含石盐子矿物且完全均一到水溶液相的HO-CO-NaCl包裹体。An improved model for calculating the composition and homogeneous pressure of H2O-CO2-NaCl is presen-ted in this paper,which is based on the model advanced by Song et al.in 2007 and used the updated H2O-CO2-NaCl thermodynamic equations of Duan et al.The authors use a more accurate equation to calculate the solubility and molality of CO2 and extend the pt range（homogenization temperature ≥300℃） into the middle part with t of 0～260 ℃ and p of 0～1 000×105 Pa.This new model is also suitable for the system with moderate salinity.The method used in this model is applicable to the H2O-CO2-NaCl system under the conditions that the partial homogenization temperature of the CO2 is higher than the melt temperature of the clathrate,the final homogenization wholly reaches the liquid phase and the system contains no daughter crystals.

关 键 词：地球化学 H_2O-CO_2-NaCl体系包裹体 均一压力 热力学计算 迭代法 

分 类 号：P599[天文地球—地球化学]