<p>This theoretical-experimental study focuses on developing analytical models to predict the impact of reservoir pressure and temperature conditions on the capillary pressure (P_c) characteristic curve and contact angle (CA) of surfaces in the presence of carbon dioxide. Alongside the well-known Young-Laplace equation, new moduli were introduced, by which the dependence of P_c, CA, and interfacial tension (IFT) on variations in pressure and temperature is expressed. Based on these newly defined moduli, three types of models were developed: Thermal Models, Barometric Models, and Combined Thermal-Barometric Models. The R² values for predicted water saturation versus the reported water saturations at the same P_c are 0.9983, 0.9998, and 0.9978 for the Thermal, Barometric, and Combined Model, respectively. The analysis shows that P_c varies with temperature and is influenced by factors such as the P_c measured at a base temperature, thermal CA modulus (CAM_T), thermal IFT modulus (IFTM_T), thermal permeability modulus (KM_T), thermal porosity modulus (PM_T), and temperature difference. These models are particularly beneficial for estimating P_c and CA under varying reservoir conditions.</p>