Did you ever wonder about correlations in probabilistic prospect assessment? You can correlate different parameters within one segment (e.g., a fault block) because you believe that there is a relationship between those parameters (e.g., net-to-gross and porosity). You can also correlate the same parameters (e.g., thickness) across segments, because those segments represent the same geological layer.
Get in touch if you would like to discuss intra-segment versus cross-segment correlations!