This work presents a sensitivity analysis of the different approaches and parameters that are relevant fur modelling bore-hole instabilities. The study was based on an analytical stability simulator with fully couples poroelastic formulation. The results showed that rock strength and in situ stresses affect stability more than any other rock property. A new methodology is also presented for correlating rock mineralogy from gamma ray logs to lab static tests, as an alternative to the commonly used acoustic-derived correlations. The chemical interactions between clays and the drilling fluid are predicted based on the shale's mobile/immobile water content, inferred from Nuclear Magnetic Resonance (NMR). Such methods, when integrated with the logging-while-drilling capabilities, allow wellbore instability prediction in near-real-time.