Tutorials showing GeoDict solutions to practical cases are available:
Digital Rock Physics Workflow - Image processing, segmentation, and quality control of CT-scans
Random-walk method to simulate T2 of NMR
Dissolution of a carbonate rock
Digital analysis of fibers and binder content of four carbon paper GDLs
Optimizing battery charging by varying the binder content
First Steps in GeoDict
Check these videos at Math2Market's YouTube channel.