Technologies applicable to NMR detection of water and hydrocarbons during induced alteration processes are disclosed. NMR measurements may be used to monitor properties of subsurface fluids within a subsurface formation. NMR measurement devices may be deployed proximal to or within a subsurface formation that contains hydrocarbons. Multiple NMR measurements may be performed during an induced alteration process applied to the subsurface formation to determine properties of the subsurface formation or fluid as the induced alteration process progresses. Changes in properties of the subsurface formation or fluid may be determined and may be used to determine efficacy of, optimize, or otherwise modify the induced alteration process.