1. A computer program product comprising machine readable instructions stored on machine readable media, the instructions for correlating nuclear magnetic resonance (NMR) well logging data with other well logging data, the product comprising instructions for: receiving the NMR well logging data; receiving the other well logging data; determining a tendency of the NMR logging data to correlate with the other logging data; and providing output comprising correlation information defining a degree of similarity between the NMR well logging data and the other well logging data.