Abstract: A method for determining a component of electric field response of the Earth's subsurface to a time-varying electromagnetic field induced in the Earth's subsurface is provided. The method includes measuring electric field response along a nonlinear pattern on at least one of the Earth's surface and the bottom of a body of water. The method includes measuring magnetic field response in three directions along the nonlinear pattern on at least one of the Earth's surface and the bottom of the body of water. The method further includes determining an electric field response in a direction normal to the measured electric field response using the electric field response and magnetic field response measurements.

Abstract: A method for determining a component of electric field response of the Earth's subsurface to a time-varying electromagnetic field induced in the Earth's subsurface is provided. The method includes measuring electric field response along a nonlinear pattern on at least one of the Earth's surface and the bottom of a body of water. The method includes measuring magnetic field response in three directions along the nonlinear pattern on at least one of the Earth's surface and the bottom of the body of water. The method further includes determining an electric field response in a direction normal to the measured electric field response using the electric field response and magnetic field response measurements.

Abstract: An electromagnetic induction logging method is disclosed. The method includes measuring electromagnetic induction response in earth formations surrounding a wellbore. The measuring is performed on an electrically conductive sonde support. The measured response is deconvolved with respect to a response of an instrument not having an electrically conductive sonde support.

Abstract: An electromagnetic induction logging method is disclosed. The method includes measuring electromagnetic induction response in earth formations surrounding a wellbore. The measuring is performed on an electrically conductive sonde support. The measured response is deconvolved with respect to a response of an instrument not having an electrically conductive sonde support.

Abstract: An electromagnetic induction logging instrument is disclosed, which includes an electrically conductive support. At least one magnetic dipole transmitter antenna is disposed on the support. At least one magnetic dipole receiver antenna is disposed on the support and is axially spaced apart from the position of the transmitter antenna. The instrument includes a magnetically permeable shield disposed between the support and the transmitter and receiver. The shield extends substantially the distance between the transmitter and receiver. A measurement while drilling instrument is also disclosed, including an electrically conductive collar, at least one transmitter antenna disposed at a selected position on the collar and at least one receiver antenna disposed on the collar axially spaced apart from the transmitter antenna. A magnetically permeable shield is disposed between the collar, and the transmitter and receiver, and extends substantially the distance between the transmitter and receiver.