1. A method for generating one or more geological models for oil field exploration, comprising: receiving one or more well facies logs, a vertical facies proportion curve, a lateral proportion map, a variogram model and a global target histogram; generating a facies probability cube using a modified Sequential Gaussian Simulation (SGSIM) algorithm, the well facies logs, the vertical facies proportion curve, the lateral proportion map and the variogram model; matching the facies probability cube to the global histogram; and generating the geological models based on the matched facies probability cube.