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标题：Types of formation water and produced water in Danish oil- and gasfields: implications for enhanced oil recovery by injection of ‘smart’ water
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作者：Niels H. Schovsbo ; Hanne D. Holmslykke ; Claus Kjøller 等
期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2016
卷号：35
页码：43-46
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：Injection of chemically tuned, ‘smart’ water in oil reservoirs may increase both oil recovery rates and the totalrecovery (e.g. Morrow & Buckley 2011; Austad 2013;Zeinijahromi et al. 2015). This kind of water managementhas gained increased importance in the Danish North Seareservoirs due to decreasing sweep efficiency in maturingoilfields. Knowledge about the compatibility of the injectedwater with local formation waters is, however, a prerequisite for successful implementation. Here, we present a regional overview of formation waters from oil reservoirs inthe Danish North Sea, which comprise three main typesof formation brine, and one type of modified seawater related to extensive water flooding. The water types show adistinct geographical distribution, which reflects originalconnate waters that are modified by saline brine being either depleted or enriched in SO42–.