Figure 9

Logging response characteristics of different occurrences of fractures. (a) Logging response for low angle fractures show that five low-angle structural fractures are nearly parallel, and the RT values decrease significantly from 4337 to 500 Ω·m (Well L16 at 2225.6 m). (b) Three horizontal fractures can be seen from the core, partly filled with mud. The RT values decrease from 7000 to 50 Ω·m, and the RT curve has a spike-like shape. The DEN and the AC values clearly increase (Well X8 at 1745.6 m). (c) Oblique opened fractures can be seen in the core. The AC and the GR values have no obvious changes. The RT values decrease to about 1500 Ω·m, and the RT curve has in a dentate shape (Well C2 at 1879 m). (d) High-angle fractures can be seen from the core. The GR, AC, and RT values are the same as those of the matrix rock section (Well W6 at 2122.98 m).