Study on CO2 EOR and its geological sequestration potential in oil field around Yu lin city

Ordos Basin is enriched with oil and gas resources. It is the first largest low permeability petroliferous onshore basin in China with proved reserves more than 10 x 10(8) t. While most oil fields are suitable for applying CO2 EOR and storage techniques, it provides good opportunity to reduce the country's energy intensity and amount of CO2 emissions into the atmosphere. This study aimed at assessing the potential of CO2 EOR and storage in Yulin surrounding areas within 300 km range based on the data of mature oil reservoirs. The Assessments including regional geology assessment, storage site screening, CO2 EOR method, reservoir screening for CO2 EOR and EOR potential and storage capacity calculations. The evaluation results demonstrate that oil fields in Yulin surrounding areas have good geographical and geological conditions for CO2 storage. Of all 17 reservoirs, nine are suitable for CO2 immiscible flooding and eight are suitable for CO2 miscible flooding. The average incremental oil recovery ratios for immiscible and miscible flooding are 6.44% and 12% respectively. Total EOR potential is 8 x 10(7) t and CO2 storage capacity could reach 1.3 x 10(8) t. (C) 2015 Elsevier B.V. All rights reserved.