Affiliation:
1. College of Carbon‐Neutral Energy China University of Petroleum (Beijing) Beijing 102249 China
2. National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum (Beijing) Beijing 102249 China
3. Unconventional Petroleum Research Institute China University of Petroleum (Beijing) Beijing 102249 China
4. Petroleum Institute China University of Petroleum‐Beijing at Karamay Karamay Xinjiang 834000 China
5. College of Artificial Intelligence China University of Petroleum (Beijing) Beijing 102249 China
6. Key Laboratory of Groundwater Resources and Environment, Ministry of Education Jilin University Changchun 130021 China
7. Oil and Gas Survey China Geological Survey Beijing 100083 China
Abstract
AbstractThe Lucaogou Formation, located in the Jimsar Sag, Junggar Basin, NW China, has great potential for shale oil resources. In the process of CO2‐EOR (CO2 enhance oil recovery), mineral dissolution, precipitation and transformation, leading to the local corrosion or blockage of reservoirs, have a significant influence on recovery. In this study, a combination of high‐temperature and high‐pressure laboratory experiments and coupled temperature/fluid‐chemistry multi‐field numerical simulations are used to investigate CO2‐water‐rock reactions under various reservoir conditions in the upper and lower ‘sweet spots’, to reveal the mechanisms underlying CO2‐induced mineral dissolution, precipitation and transformation. In addition, we quantitatively calculated the evolution of porosity over geological timescales; compared and analyzed the variability of CO2 transformation in the reservoir under a variety of temperature, lithology and solution conditions; and identified the main factors controlling CO2‐water‐rock reactions, the types of mineral transformation occurring during long‐term CO2 sequestration and effective carbon sequestration minerals. The results demonstrate that the main minerals undergoing dissolution under the influence of supercritical CO2 are feldspars, while the main minerals undergoing precipitation include carbonate rock minerals, clay minerals and quartz. Feldspar minerals, especially the initially abundant plagioclase in the formation, directly affects total carbon sequestration, feldspar‐rich clastic rocks therefore having considerable sequestration potential.
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4 articles.
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