| 摘要 |
<p>In a method and apparatus for well logging use, an antenna (40) is supported in a sonde (10) and the transmitted electrical wave has circular polarisation. The apparatus comprises: (a) transmitter means (34) for forming a signal to be transmitted; (b) transmitter antenna means (40) connected to said transmitter for forming a transmitted signal, said antenna means forming a signal having circular polarization. (c) receiver antenna means (36) for receiving a signal return by formations adjacent to the well borehole as a result of operation of said transmitter; (d) said receiver means further including means responsive to polarization of the received signal thereat wherein the polarization indicates reflected or refracted waves. <IMAGE></p> |
