{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T11:13:56Z","timestamp":1770376436637,"version":"3.49.0"},"posted":{"date-parts":[[2026]]},"group-title":"SSRN","reference-count":40,"publisher":"Elsevier BV","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>CO2 geostorage is a well-established solution for long-term carbon storage towards carbon neutrality goals. Injected CO2 streams are often captured at fossil fuel plants and\/or oil and gas fields and consequently contaminated with impurities. These impurities require an energy-intensive purification process, thereby increasing costs. This high cost is considered among the main barriers to effective CCS deployment. One way to reduce the costs is by reducing the purity of the injected CO2 stream without compromising the safety and performance of the operation. While some impurities enhance storage efficiency, others reduce it. To understand this effect, determining the CO2 stream purity requires the study of the impact of impurities on the CO2 plume spatiotemporal evolution. To assess these impacts, we propose herein a geo-modelling workflow using compositional fluid simulation in porous media to evaluate the effects of impurities (N2, O2, NO2, SO2, H2S, CO, and H2O). We use a simplified version of the Illinois Basin Decatur Project reservoir model for computational efficiency. Monte Carlo simulation is applied for sensitivity analysis of a wide range of impurities, allowing the identification of impurity mixtures from hard-to-abate process plants that have good injectivity and long-term CO2 storage. Our numerical examples show that non-condensable gases, such as N2, O2, and H2S, significantly lead to lower injectivity and high dispersion of the CO2 plume due to lower stream density. In contrast, H2O has a positive impact on injectivity and storage, while NO2, SO2, and CO have negligible effects and can be tolerated within specific concentration ranges. The study also highlights that some compositions of impurities have less significant impact on injection and on the spread of the gas plume.<\/jats:p>","DOI":"10.2139\/ssrn.6183552","type":"posted-content","created":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T19:44:27Z","timestamp":1770320667000},"source":"Crossref","is-referenced-by-count":0,"title":["Assessing the impact of impurities on CO2 Geostorage \u2013 a case study on Illinois Decatur Project"],"prefix":"10.2139","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1347-2165","authenticated-orcid":true,"given":"Shahmir","family":"Nosherwani","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3061-9632","authenticated-orcid":true,"given":"Mois\u00e9s","family":"Pinto","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0677-079X","authenticated-orcid":true,"given":"Leonardo","family":"Azevedo","sequence":"additional","affiliation":[]}],"member":"78","reference":[{"issue":"15","key":"ref1","first-page":"8482","article-title":"A revised 1000 year atmospheric ? 13 C-CO? record from Law Dome and South Pole, Antarctica","volume":"118","author":"M Rubino","year":"2013","journal-title":"Journal of Geophysical Research: Atmospheres"},{"key":"ref2","article-title":"Impact of Grid Resolution on Accuracy of In-Situ CO? 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