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P VTx properties of the CO_2-H_2O and CO_2-H_2O-NaCl systems below 647 K:Assessment of experimental data and thermodynamic models

I-Ming Chou  
【摘要】:正Evaluation of CO_2 sequestration in formation brine or in seawater needs highly accurate experimental data or models of pressure-volume-temperature-composition(PVTx) properties for the CO_2-H_2O and CO_2-H_2O-NaCl systems.This paper presents a comprehensive review of the experimental PVTx properties and the thermodynamic models of these two systems.The following conclusions are drawn from the review:(1) About two-thirds of experimental data are consistent with each other,where the uncertainty in liquid volumes is within 0.5%,and that in gas volumes within 2%.However,this accuracy is not sufficient for assessing CO_2 sequestration.Among the data sets for liquids,only a few are available for accurate modeling of CO_2 sequestration. These data have an error of about 0.1%on average,roughly covering from 273 to 642 K and from 1 to 35 MPa;(2) There is a shortage of volumetric data of saturated vapor phase.(3) There are only a few data sets for the ternary liquids,and they are inconsistent with each other,where only a couple of data sets can be used to test a predictive density model for CO_2 sequestration; (4) Although there are a few models with accuracy close to that of experiments,none of them is accurate enough for CO_2 sequestration modeling,which normally needs an accuracy of density better than 0.1%.Some calculations are made available on www.geochem-model.org.

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