The article discusses the growing interest in hydrogen as a clean and sustainable energy solution, particularly produced in-situ from heavy oil reservoirs. Hydrogen is highlighted as a versatile energy carrier with applications in fuel cells for vehicles and industrial processes, contributing to decarbonization efforts. The article emphasizes the significance of in-situ production for leveraging existing oil and gas infrastructure and underutilized resources. The need for accurate numerical models in predicting hydrogen production is addressed, with a call to incorporate SARA-based hydrocarbon characterization for improved reliability. The article introduces a novel model aiming to provide a detailed representation of heavy oil composition and enhance understanding of hydrogen production mechanisms. It emphasizes the importance of rigorous comparison with existing studies and experimental data for model validation. Furthermore, the research aims to explore the impact of different injection strategies, such as pure oxygen and CO2 injection, on hydrogen production efficiency and the hydrogen-to-syngas ratio. By conducting a comprehensive sensitivity analysis varying the oxygen to nitrogen ratio, the study seeks to optimize hydrogen yield while minimizing undesired reactions. The ultimate goal is to refine hydrogen generation strategies, support large-scale projects, and align with eco-friendly initiatives for a low-carbon energy landscape.