RHOB vs NPHI for six wells in a 4variable probabilistic clustering analysis using 10 modes (flow units). Each sample is probabilistically assigned to all 10 modes. Here, the samples are colorcoded to the mode with the highest (crisp) probability. The ellipses are 4dimensional ellipsoids projected onto the RHOBNPHI plane and drawn at ~ 2 standard deviations from the mean. The legend shows the lithologic interpretation for each mode. 

A downstream module (MFBG) permits development of profiles for porosity, permeability, and water saturation using the results of clustering plus a mineralogybased forward modeling procedure. This box model shows matrix and fluid components considered in the modeling process. 

This cross section shows the results of a 29well clustering analysis through the Wilcox Formation in a gas field in Texas. The horizontal axis for each well is cumulative probability with fractional probability assignments (for each mode) stacked lefttoright for each sample. Sands = reds and yellows, siltstones = greens, and shales = grays. 



