  Microbially induced calcite precipitation (MICP) is a technology for sealing
leakage paths to ensure the safe storage of CO$_2$ in geological formations. In
this work we introduce a numerical simulator of MICP for field-scale studies.
This simulator is implemented in the open porous media (OPM) framework. We
compare the numerical results to simulations using an upgraded implementation
of the mathematical model in the MATLAB reservoir simulation toolbox (MRST).
Finally, we consider a 3D system consisting of two aquifers separated by
caprock with a leakage path across the width of the reservoir. We study a
strategy where microbial solution is injected only at the beginning of the
treatment and subsequently either growth solution or cementation solution is
injected for biofilm development or calcite precipitation. By applying this
strategy, the numerical results show that the MICP technology could be used to
seal these leakage paths.
