| 摘要 |
<p>This invention is directed to a method and apparatus for evaluating an earth formation. The present invention provides a resistivity logging tool (10) with a transmitter (T1-Tn) and a receiver (R1,R2) oriented at different angles relative to the longitudinal axis of the tool body (10). The logging tool (10) is rotated during drilling and a parameter of the earth formation is evaluated with reference to received electromagnetic energy at the receiver and a rotational position indicator.
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