An attempt to integrate geophysics and petrophysics to evaluate reliable indicators of hydrocarbons has been made. The main purpose of this work is to identify and discriminate fizz and commercial Gas in the Colombian Caribbean basins through seismic modeling, fluids substitution and extraction of AVO attributes. To achieve this objective all the available information from well logs and the sensitivity analysis of the equation proposed by BORTFELD (1961) as a lineal approximation of ZOEPPRITZ to study the reflection and refraction coefficients has been used. This equation has two main terms: a fluid term that depends on P‐wave velocity, and the rigidity term which depends on S‐wave velocity, both determine a discriminating pattern for cases in which the rock is saturated with water, fizz gas or commercial gas. The advantage of using these attributes (fluid and rigidity), is that they allow to analyze explicitly the behavior of the velocities based in amplitude variations with the offset as a function of the rock elastic properties for each saturation scenarios proposed (Sw 100%, Sw 90% and Sw 30%). Hence, it is applied as an additional tool during the exploration phase to understand the gas rock saturation state in the Colombian Caribbean basins.