Table 4 Well log response statistics of gas-bearing and without gas-bearing mudstone in Shanxi Formation with 4 wells.
Log data | Total gas content ≥ 1 m3/t | Total gas content < 1 m3/t | ||
|---|---|---|---|---|
Distribution range | Dominant distribution range | Distribution range | Dominant distribution range | |
GR (API) | 85.0–185.2 | 118.0–140.0 | 85.0–150.2 | 116.0–138.0 |
RT (Ω·m) | 14.2–90.2 | 20.0–50.0 | 4.1–25.2 | 15.0–19.0 |
AC (μs/m) | 200.0–320.0 | 221.0–262.0 | 198.0–342.4 | 221.0–250.0 |
CNL (%) | 9.0–37.2 | 18.0–33.0 | 20.0–59.2 | 23.0–35.0 |
DEN (g/cm3) | 2.18–2.93 | 2.44–2.63 | 2.03–2.74 | 2.52–2.74 |
K (%) | 0.9–4.2 | 1.0–2.3 | 0.6–3.1 | 1.2–2.2 |
TH (ppm) | 10.0–24.5 | 16.0–19.0 | 3.6–23.2 | 12.5–21.2 |
U (ppm) | 2.8–5.6 | 3.2–5.0 | 1.6–4.4 | 3.0–4.4 |
ΔSP (mv) | −12.7–16 | −9.0–0 | −12.4–15 | 6.0–1.0 |
