Abstract：In solving the wave equation of Hertzian vector potential in multilayer medium,the coefficient recursion relations and the expressions for the electromagnetic fields generated by four kinds of dipoles,namely vertical electric dipole,vertical magnetic dipole,horizontal electric dipole and horizontal magnetic dipole in any layer,can be derived from both the tangential component continuity and the symmetry of the electromagnetic field on any interface in the medium. The stack of vertical and horizontal dipole fields favours successfully analysing the forward problems in borehole to borehole and borehole to ground seismic measurements,horizontal-well induction log,and induction diplog.
