Strontium isotope (87SR/86SR) chemistry in produced oilfield waters: The IEA Weyburn CO2 Monitoring and Storage Project

Publisher Summary Istituto Nazionale di Geofisica e Vulcanologia (INGV) conducted geochemical monitoring of the Weyburn field oil waters in conjunction with the Canadian partners (University of Calgary and ARC), which started this IEA project work package also during the pre-injection "baseline" phase. Apart from the main chemistry and gas chemistry, selected isotopic ratios were analyzed too during the project, with the main objective to deepen the knowledge about the carbon dioxide (CO2) storage potential and WRI processes as a whole. The purpose of produced fluid and gas isotope monitoring is to identify and ultimately to quantify water-gas-rock reactions in the reservoir and to better predict the long-term storage of CO 2 in the subsurface. At Weyburn, a water-alternating-gas (WAG) EOR technique is used to inject water and CO 2 into the Midale beds. However, Strontium isotopic compositions of the produced water prior to water flooding are not available.