期刊
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
卷 19, 期 -, 页码 642-651出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2013.01.036
关键词
CO2; Geological storage; Dissolution; Residual trapping; Field experiment
类别
资金
- Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS) [214-2008-1032]
- European Community [227286]
Field testing is a critical step to improve our knowledge on in situ-trapping mechanisms of CO2 injected in geological formations and their relative importance. In this study, we present a two-well test sequence aimed at quantifying field values of both residual and dissolution trapping of CO2. Then, we apply it to the Heletz experimental CO2 injection site, using numerical modelling. The sequence includes a hydraulic test to measure residual scCO(2) saturation and a novel tracer technique, together with measurements of abstracted fluid compositions for quantification of the rate of CO2 dissolution in the reservoir. The proposed tracer technique uses a tracer with negligible aqueous solubility, which is injected with the scCO(2) and enriched in the scCO(2) phase as CO2 dissolves. We show that this tracer can provide direct information about the dissolution of mobile scCO(2). We also show that the rate of abstracted dissolved CO2 can be used to predict the total rate of CO2 dissolution, provided that the amount of dissolved CO2 in the formation stabilizes, and that this can be achieved with the proposed abstraction scheme. We conclude that the combination of these measurements is a promising tool for detailed field-scale characterization of residual and dissolution trapping processes. (C) 2013 Elsevier Ltd. All rights reserved.
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