This study presents the results of combining rock physics, seismic inversion and multiattributes transforms to estimate rock reservoir properties of Cretaceous aged sandstones deposited in a fluvial‐deltaic environment (Caballos Formation) from The Balcon Field. This study, which developed out of a need to better understand the significance of seismic amplitude variations at the reservoir level and their relationship with rock properties, determined that acoustic related seismic attributes (velocity and acoustic impedance) are sensitive to changes in rock porosity and lithology. In spite of the high scatter observed in the cross‐plots, due to factors such as composition, clay content, diagenesis and texture of the rock, two main rock physics trends are recognized. Thus, the lower stratigraphic unit, which is composed of poorly sorted dirty sandstones deposited in a fluvial environment with high clay content, has higher velocity and lower porosity than the upper stratigraphic unit, which is composed of well‐sorted and clean deltaic sandstones. Cross‐plots also indicate that the porosity‐velocity and porosity‐acoustic impedance relation are greatly improved when stratigraphic constraints are used. It is demonstrated that the acoustic impedance attribute derived from model‐based inversion can be used as the main seismic attribute to estimate spatial distribution of rock properties in the Balcon Field. If this attribute is combined with other seismic attributes in linear or non‐linear mode, the match between well‐attribute log derived properties (Porosity and Gamma Ray log) and the predicted values is improved to a great extent.