Emulsification is commonly observed during water flooding, surfactant flooding, and polymer flooding in heavy oil reservoirs. The presence of emulsions can significantly enhance oil recovery efficiency, making it crucial for the development of heavy oil reservoirs. However, the description of emulsification phenomenon is basically based on the observation of produced fluid and the monitoring of pressure points along the way. The real emulsification situation in porous media cannot be observed. In our study, we employed Nuclear Magnetic Resonance (NMR) experimental methods to analyze the emulsification of heavy oil within porous media. Firstly, we conducted D-T2 two-dimensional (2D) spectrum scanning on equal volumes of free water, oil-in-water emulsions, and water-in-oil emulsions. Secondly, we performed D-T2 2D spectrum scanning on equal volumes of oil-in-water emulsions and water-in-oil emulsions at three different temperatures. Finally, we tested the D-T2 2D spectra of emulsions within porous media at different temperatures. The results showed that the water signal falls on the free water line in the D-T2 two-dimensional spectrum of free water. In the D-T2 two-dimensional spectrum of water-in-oil emulsion, water is limited by the dispersed phase droplets, and the water signal falls below the free water line. In the D-T2 two-dimensional spectrum of the oil-in-water emulsion, the degree of water diffusion is not limited, and the deviation from the free water line is not far. The higher the temperature, the more conducive to the formation of water-in-oil emulsion, but reduced the stability of oil-in-water emulsion. The existence of porous media will make the stability of water-in-oil emulsion worse, and the higher the temperature, the worse the stability. However, the existence of porous media will lead to the decrease of the relaxation time of the aqueous phase in the oil-in-water emulsion, and the confined diffusion of the aqueous phase is not obvious under different temperature conditions. This experiment provides a new method and theory for studying the emulsification phenomenon of heavy oil in porous media. The research results can more accurately predict and guide the production and efficiency of heavy oil reservoirs.