This document describes a method for simulating complex geological structures using block scenarios. It involves: 1) Creating a binary reference image from a human interpretation of seismic data. 2) Generating blocks of varying sizes based on marker points, with larger blocks in areas of fewer markers. 3) Simulating multiple realizations conditioned on the block scenario to characterize uncertainty. 4) Evaluating uncertainty using probability maps, P10/P90, and identifying areas of higher uncertainty.