| 摘要 |
A resistivity logging tool includes one or more pads (307a, 307b, 307c, 307d) for making azimuthal resistivity measurements of earth formation. Current from the pads (307a, 307b, 307c, 307d), guard electrodes (331b, 331c, 331b', 331c') and a measure electrode are measured while monitoring the voltage difference between pairs of monitor electrodes (321a, 321b, 321a', 321b'). In addition, microelectrodes (309a, 309b) are provided on the pads for obtaining high resolution resistivity measurements. |
