Design of a two-well field test to determine in situ residual and dissolution trapping of CO2 applied to the Heletz CO2 injection site

► We design a two-well field test to measure CO2 dissolution and residual trapping. ► We present a novel tracer technique to measure in situ CO2 dissolution. ► We model and demonstrate the test applied to the Heletz field site. ► We show that dissolution rates of mobile and trapped CO2 can be determined.