A new open source graphical tool, called TIM, has been developed to aid the workflow of TOUGH2 reservoir model development and calibration. Visualisation of model parameters and simulation results is TIM’s main feature. It also allows the user to manipulate the model data file interactively. In contrast to some other software tools which excel at qualitative 3-D visualisation and presentation, TIM mainly aims at producing easily accessible 2-D layer and 2- D slice plots that integrate the display of colour, text and flow arrows. This allows clearer quantitative assessment of local model behaviour which is often important for manual model calibration. In this respect, the software fills a gap among the available graphical pre-/post-processors for TOUGH2. Instead of a more generic design focused on complete flexibility, the user interface is tailored to match the common workflow of model calibration. The operation of the software is designed to ease the cycle of parameter adjustment, simulation, and visualisation and plotting of results. The software is written in the Python programming language, and makes use of the PyTOUGH library and the application framework PyQt. This allowed very rapid development, and provides cross-platform functionality and easy extensibility. The software has already proven very useful with only limited time and energy invested in its development.

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