A unified approach to Performance Assessment (PA) of geological CO2 storage

Abstract Performance Assessment (PA) evaluates the effectiveness of a specified system or sub-system relative to some criteria of interest to particular stakeholders. A flexible PA approach has been developed for geological CO 2 storage, by which qualitative information, quantitative data, output from numerical models and expert judgments are combined within a decision-support framework. The methodology has been implemented in three software tools: (1) TESLA, which is used to construct decision trees, propagate evidence and record the logic underlying a decision; (2) an on-line database of Features, Events and Processes (FEPs) targeted at CO 2 storage; and (3) QPAC-CO2, for modelling system performance.