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Line 76: − + − ! Water Wet − ! Neutrally Wet − ! Oil Wet − + − − − − − − − + − − − − + − − − − + − − − − + − − − − − − − + − − − − + − − − − + − − − − − [[file:wettability_fig2.png|thumb|{{figure number|2}}Combined Amott and USBM method. (After Anderson;<ref name=pt05r14>Anderson, W. G., 1986b, Wettability literature survey—Part 2, Wettability measurements: Journal of Petroleum Technology, v. 38, p. 1246–1262., 10., 2118/13933-PA</ref> from Shamra and Wunderlich.<ref name=pt05r143>Shamra, M. M., Wundlerlich, R. W., 1985, The alteration of rock properties due to interactions with [[drilling fluid]] components: Annual Technical Conference and Exhibition of the Society of Petroleum Engineers, Las Vegas, NV, Sept. 22–25, SPE 14302.</ref>)]]
→Amott method
|+ {{table number|1}}Approximate relationship among wettability, contact angle, and the USBM and Amott wettability indexes
|+ {{table number|1}}Approximate relationship among wettability, contact angle, and the USBM and Amott wettability indexes
|-
|-
!
! || Water Wet || Neutrally Wet || Oil Wet
|-
|-
| Contact angle
| Contact angle || || ||
|
|
|
|-
|-
| Minimum
| Minimum || 0° || 60 to 75° || 105 to 120°
| 0°
| 60 to 75°
| 105 to 120°
|-
|-
| Maximum
| Maximum || 60 to 75° || 105 to 120° || 180°
| 60 to 75°
| 105 to 120°
| 180°
|-
|-
| USBM wettability index
| USBM wettability index || W near 1 || W near 0 || W near -1
| W near 1
| W near 0
| W near -1
|-
|-
| Amott wettability index
| Amott wettability index || || ||
|
|
|
|-
|-
| Displacement by water ratio
| Displacement by water ratio || Positive || Zero || Zero
| Positive
| Zero
| Zero
|-
|-
| Displacement by oil ratio
| Displacement by oil ratio || Zero || Zero || Positive
| Zero
| Zero
| Positive
|-
|-
| Amott-Harvey wettability index
| Amott-Harvey wettability index || 0.3 to 1.0 || –0.3 to 0.3 || –1.0 to –0.3
| 0.3 to 1.0
| –0.3 to 0.3
| –1.0 to –0.3
|}
|}
===USBM method===
===USBM method===