| 摘要 |
A method for determining at least first and second distances from a device t o at least a first layer and a second layer in a formation, whereby at least o ne of the first and second layers comprises an electromagnetic induction anomal y, the device comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting responses. In the method, a device is brought inside a wellbore in the formation, an electromagnetic signal transmitted using the transmitter, one of apparent conductivity and apparent resistivity calculated based on a receiver-detected response and monitored over time. The first and second distances are determined based on observed changes of the one of apparent conductivity and apparent resistivit y.
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