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Understanding the carbon dioxide sequestration in low‐permeability saline aquifers in the Ordos Basin with numerical simulations

Jian Xie, Keni Zhang, Litang Hu, Yongsheng Wang and Maoshan Chen

Greenhouse Gases: Science and Technology, 2015, vol. 5, issue 5, 558-576

Abstract: A carbon dioxide (CO 2 ) capture and storage demonstration project was started in 2010 by injecting around 100 000 tonnes of super‐critical CO 2 per annum into a set of very low‐permeability sandstone at depths of more than 1600 m in the northeastern Ordos Basin, China. Based on the site‐specific geology and the observational data, a numerical injection model was developed in order to understand the hydrodynamic behavior of CO 2 in the subsurface for evaluating reservoir performance. The results show that the model reasonably described the spreading of the CO 2 plume. The Triassic Liujiagou sandstone aquifer is the most favorable storage formation for CO 2 sequestration at the site of interest. After three years of injection of CO 2 , the maximum lateral migration distance of CO 2 plume is about 550 m and the pressure build‐up is about 13 MPa in the Liujiagou formation for the actual injection simulation. The major storage layer is at depths of 1690–1699 m, which contributes around 80% of injectivity of the entire reservoir system. The leakage of CO 2 into the geological seals is negligible (>0.1%) over the entire simulation period. Regardless of the relatively good fit during the calibration period, the model overestimated the pressures associated with the injection thereafter. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

Date: 2015
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