NUCLEUS – A Matlab-based graphical user interface for forward and inverse modelling of NMR relaxometry data

For several decades laboratory NMR relaxometry measurements have been used within the geoscientific community to characterize porous materials. Generally, the target parameters of such measurements are porosity and pore size. NUCLEUS is a set of Matlab tools, that allow forward and inverse modelling of such NMR relaxometry data ( T 1 and T 2 relaxation). The main front-ends to these tools are two graphical user interfaces, NUCLEUSmod and NUCLEUSinv for forward and inverse modelling, respectively. NUCLEUS enables a simple way to create synthetic NMR relaxometry data based on a pore size distribution which has a specific cross-sectional shape (geometry) and a pressure-dependent (de)-saturation state. Additionally, a variety of real laboratory NMR relaxometry measurements can be imported and processed based on different user-selectable inversion and regularization options.