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Pembina Cardium CO2 Monitoring Project, Alberta, Canada—Geochemical interpretation of produced fluid compositions
| Content Provider | Semantic Scholar |
|---|---|
| Author | Talman, S. J. Perkins, Ernie |
| Copyright Year | 2009 |
| Abstract | Abstract A CO 2 monitoring pilot was initiated at the Penn West Energy Trust CO 2 EOR operations within the Cardium formation of the Pembina Field. The Penn West Pembina-Cardium CO 2 EOR Monitoring research program focused on well integrity, local/ regional geology and hydrology, extensive monitoring of CO 2 and short and long predictive modeling. The geochemical modelling program of the Penn West Monitoring Project quantified the chemical reactions that occur between the gas -oil-water-rock within the reservoir prior to, during, and following CO 2 injection. An equilibrium speciation geochemical model was used to examine the field produced water compositions. Many of the produced waters are undersaturated with respect to calcite. This is most easily explained when mixtures of waters of quite different chemical compositions are produced from a single producing well. This observation has important implications for the interpretation of produced water compositions and demonstrates that flow within the reservoir must be understood to fully interpret the chemistry signatures. A reaction mass transfer model was used to evaluate the chemical processes in the reservoir (short and long term) and to evaluate the thermodyn amic data base. It established that the dominant reaction controlling the short term water composition was ion exchange reactions, coupled with calcite dissolution and CO 2 transfer from the oil phase. It was also used as a predictive tool to estimate them ineralogical reactions which will ultimately be responsible for the long term trapping of the injected CO 2 . GEM-GHG was used to calculate the chemical processes occurring during the various phases of hydrocarbon recovery, including the predicted evolution of produced water compositions, and th e results compared to field measurements. Discrepancies between the modeled and the measured field data can be used to refine the model, improving our understanding of chemical processes in the reservoir. The geochemic al models allow an assessment of the amount of CO 2 trapping in each of the major units in the reservoir. There are large uncertainties in the absolute value of the amounts, but they allow a direct comparison between trapping mechanisms and a direct comparison between the trapping in each reservoir unit. This work represents a first study to demonstrate the potential of using geochemical sampling and measurements and integrating them with reservoir models for secondary and tertiary oil recovery. |
| Starting Page | 2151 |
| Ending Page | 2159 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.egypro.2009.01.280 |
| Volume Number | 1 |
| Alternate Webpage(s) | https://core.ac.uk/download/pdf/81108356.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.egypro.2009.01.280 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
