| Abstract: | Evaluation of CO2 sequestration in formation brine or in seawater needs highly accurate experimental data or models of pressure-volume-temperature-composition (PVTx) properties for the CO2-H2O and CO2-H2O-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 CO2 sequestration. Among the data sets for liquids, only a few are available for accurate modeling of CO2 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 CO2 sequestration; (4) Although there are a few models with accuracy close to that of experiments, none of them is accurate enough for CO2 sequestration modeling, which normally needs an accuracy of density better than 0.1%. Some calculations are made available on www.geochem-model.org. ?? 2006 Elsevier B.V. All rights reserved. |
| Genre: | Article |
| ProdID: | 70029707 |
| Citation Author: | Hu, J.; Duan, Z.; Zhu, C.; Chou, I. -M. |
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| Citation End Page: | 267 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Chemical Geology |
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| Citation Number Of Pages: | 19 |
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| Citation Search Results Text: | PVTx properties of the CO2-H2O and CO2-H2O-NaCl systems below 647??K: Assessment of experimental data and thermodynamic models; 2007; Article; Journal; Chemical Geology; Hu, J.; Duan, Z.; Zhu, C.; Chou, I. -M. |
| Citation Start Page: | 249 |
| Citation Volume: | 238 |
| Citation Year: | 2007 |
| Type: | citation/reference |
| Text: | PVTx properties of the CO2-H2O and CO2-H2O-NaCl systems below 647??K: Assessment of experimental data and thermodynamic models; 2007; Article; Journal; Chemical Geology; Hu, J.; Duan, Z.; Zhu, C.; Chou, I. -M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.chemgeo.2006.11.011 |
| Date Other: | Mon, 1 Jan 2007 00:00 -0600 |
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