A system and method for generating hydrogen within a petroleum reservoir and producing the hydrogen includes providing one or more wellbores into the petroleum reservoir from a surface, wherein the petroleum reservoir contains fractures by hydraulic fracturing, heating catalyst particles within the fractures of the petroleum reservoir using electromagnetic waves, wherein the heated catalyst particles generate a syngas from hydrocarbons within the petroleum reservoir, separating the hydrogen from the syngas at the surface or within the one or more wellbores, and producing the hydrogen at the surface or to the surface.