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→Deriving values for Archie variables: table
| 1
| 1
| n
| n
| * 2.0 for Archie porosity * 1.8 (or less) for rocks with clayey matrix or fractures * 4.0 for very strongly oil-wet rocks
|
* 2.0 for Archie porosity
* 1.8 (or less) for rocks with clayey matrix or fractures
* 4.0 for very strongly oil-wet rocks
| Not sure of rock type
| Not sure of rock type
| 2
| 2
| R<sub>w</sub>
| R<sub>w</sub>
| * Value calculated from SP log * Estimated from R<sub>w</sub> catalogs * Estimated from wet zone R<sub>o</sub> value * Measured from water sample
|
* Value calculated from SP log
* Estimated from R<sub>w</sub> catalogs
* Estimated from wet zone R<sub>o</sub> value
* Measured from water sample
| Thin beds, hydrocarbons in zone, or fresh formation waters make SP calculations uncertain
| Thin beds, hydrocarbons in zone, or fresh formation waters make SP calculations uncertain
| Use thin-bed correction or another method
| Use thin-bed correction or another method
| 4
| 4
| m
| m
| * 2.0 for Archie porosity * 1.7–2.0 for shaly sandstones * 2.0–2.5 for porosity with connected vugs * 2.5–3.0 for nonconnected moldic porosity * ~1.0 for fractured rocks
|
* 2.0 for Archie porosity
* 1.7–2.0 for shaly sandstones
* 2.0–2.5 for porosity with connected vugs
* 2.5–3.0 for nonconnected moldic porosity
* ~1.0 for fractured rocks
| Not sure of rock type or pore geometry
| Not sure of rock type or pore geometry
| Use 2.0
| Use 2.0