Nanoparticles designed with high electric conductivity and magnetic permeability are injected into oil reservoir to enhance the tracking of the fluid movement. The injection of fluid with nanoparticles will displace the original fluid and change the fluid content in the pore space, thus changing the electric conductivity and magnetic permeability distributions in the flooded zone. The movement of nanoparticles in a porous medium can be modeled by solving the flow transport equation and the resultant electromagnetic properties distribution can be calculated by the effective medium theory. These inhomogeneous electromagnetic property distributions will induce secondary electromagnetic fields in the receivers which can be modeled by Maxwell's equations. For subsurface sensing, in order to be detected, the secondary fields measured in the receivers should be above a certain threshold (1% above the primary fields, an empirical value). By injecting the high contrast nanoparticles, the conductivity and magnetic permeability of the flooded zone will be increased, thus increasing the secondary fields which will be more possibly detected. Also the detection range of electromagnetic measurements will be larger. With the technique of coupling of the dynamic fluid flow and crosswell electromagnetic measurement, we are able to analyze the detection range of electromagnetic sensing with high contrast nanoparticle injection.