| 摘要 |
A system and method for imaging a formation from an underground borehole. A drill rod drives a drill bit from an underground stope. At least one paired electromagnetic transmitter and receiver are electromagnetically coupled to the drill rod at or proximal to an entrance to the borehole, and are configured to launch electrical or electromagnetic signals onto the drill rod within the borehole and to store a response so as to obtain an electromagnetic map of the borehole, thereby imaging features of the formation which are less than substantially 5 metres away from the borehole. |
