Patent ID: 7619540

Claim:
A logging tool, comprising: a tool body adapted for positioning in a borehole penetrating a formation; and a plurality of antenna arrays disposed on or within the tool body, the antenna arrays comprising: a simple transmitter comprising a single antenna, the simple antenna generating a magnetic field having a transverse component; and four simple receivers, each comprising a single antenna, spaced apart from the simple transmitter, wherein each of the four simple receivers is response to the magnetic field generated by the simple transmitter and at least one of the four simple receivers is response to the transverse component of the magnetic field generated by the simple transmitter; wherein the antenna arrays acquire at least four formation resistivity measurements to determine the invasion resistivity, the radius of invasion, the formation horizontal resistivity, the formation vertical resistivity, or any combination thereof, wherein the at least four formation resistivity measurements are acquired at least three different depths of investigation and at least one of the formation resistivity measurements is responsive to anisotropy.