Discussion
Match the following Resistivity curve types :
| I | II |
|---|---|
| (a) \(P_{1} \gt P_{2} \lt P_{3}\) High-Low-High | (i) Q type |
| (b) \(P_{1} \lt P_{2} \lt P_{3}\) Low-Low-High | (ii) A type |
| (c) \(P_{1} \lt P_{2} \gt P_{3}\) Low-High-Low | (iii) K type |
| (d) \(P_{1} \gt P_{2} \gt P_{3}\) High-Low-Low | (iv) H type |
Answer: A
The correct matching is (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i).
Three-layer sounding curves are named by the resistivity of the middle layer relative to the outer ones:
- \(\rho_1 \gt \rho_2 \lt \rho_3\), a conductive layer in the middle, is the H type.
- \(\rho_1 \lt \rho_2 \lt \rho_3\), resistivity rising steadily with depth, is the A type.
- \(\rho_1 \lt \rho_2 \gt \rho_3\), a resistive layer in the middle, is the K type.
- \(\rho_1 \gt \rho_2 \gt \rho_3\), resistivity falling steadily, is the Q type.
Option B swaps A and Q, and options C and D use some types twice, which a one-to-one matching cannot do.
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