Table 1 Statistics of resistivity values of NGH Reservoirs from resistivity logging.
From: The lithological characteristics of natural gas hydrates in permafrost on the Qinghai of China
Borehole | Reservoir lithology | Gas hydrate bearing layers (m) | Resistivity value of surrounding rock (Ω m) | Reservoir resistivity value (Ω m) |
|---|---|---|---|---|
DK-1 | 133.5–135.5 | Sandstone | 53.85–61.90 | 203.73–378.41 |
142.7–147.7 | Siltstone | 52.85–88.05 | 146.41–349.92 | |
165.45–166.55 | Siltstone | 30.44–34.21 | 49.48–96.99 | |
169.0–170.5 | Siltstone | 55.98–76.96 | 101.94–242.12 | |
DK-2 | 144.40–156.6 | Shaly sand | 19.42–64.39 | 28.39–182.73 |
275.8–277.1 | Siltstone | 29.55–36.69 | 45.75–70.08 | |
282.5–283.7 | Mudstone, siltstone and oil shale | 46.08–56.70 | 78.22–98.93 | |
DK-3 | 133.0–156.0 | Mudstone, siltstone and oil shale | 25.67–30.72 | 40.29–86.16 |
225.1–240.0 | Mudstone | 29.86–35.5 | 25.37–47.95 | |
367.7–396.0 | Mudstone | 24.87–27.91 | 24.17–59.64 | |
DK-4 | 115.0–150.0 | Siltstone, mudstone | 70.16–77.54 | 57.87–153.70 |
162.0–163.0 | Siltstone, mudstone | 59.71–61.51 | 66.44–84.22 | |
DK12-13 | 157.5–160.3 | Siltstone | 91.11–210.21 | 260.3–396.6 |
201.3–203.5 | Shaly sand | 37.3–56.4 | 80.19–170.12 | |
263.2–265.4 | Mudstone | 12.17–20.21 | 30.03–55.89 | |
314.0–316.1 | Siltstone | 120.02–183.67 | 200.89–300.51 |
