Petroleum retrieval factor is laborous to compound because of the fact the inhomogeneity of the subsurface porous reservoir rocks. The major customary/regular aproach/attitude is to make use of likelyhood/probability P10 and P90 to roguhly calculate/approximate feasible retreival and which great unreliability uncertainty. Not long ago advancement in calculation computation inhomogenous of subsurface porous reservoir rocks: digital core sample tehnolofy, that evolved to rebuild 3-D digital porous rock from powerful resolution picture and high powered computing. Simulataneous flow of multiple flud is might be calculated to evaluate the way petroleum’s motion behaviour inside the porous structure. Subsequently, diverse/multiple wettability dispensations have multiple motion behaviour which accompany to critically diverse retreival system might be thoroughly enquired into. This recently developed methods of retreival of petroleum fluids out of complex subsurface structure.