Pressure gradient wells (0)
| normally pressured or underpressured |
| overpressured vs freshwater gradient (> 0.433 psi/ft) |
| overpressured vs driller gradient (> 0.465 psi/ft) |
Pressure gradient contour lines (1)
| 0.1 |
| 0.2 |
| 0.3 |
| 0.433 |
| 0.465 |
| 0.5 |
| 0.6 |
| > 0.7 |
Pressure gradient surface (2)
| 0.002 - 0.1 |
| 0.1 - 0.2 |
| 0.2 - 0.3 |
| 0.3 - 0.433 |
| 0.433 - 0.465 |
| 0.465 - 0.5 |
| 0.5 - 0.6 |
| 0.6 - 0.7 |
| >0.7 |
Max shut-in pressure surface (3)
| < 1,000 |
| 1,000 - 2,000 |
| 2,000 - 3,000 |
| 3,000 - 4,000 |
| 4,000 - 5,000 |
| 5,000 - 6,000 |
| 6,000 - 7,000 |
| 7,000 - 8,000 |
| >8,000 |
|