| Specific Gravity * | API Gravity | High perm | Medium perm | Low perm | Tight (Shale) |
---|
| frac | API | > 100 md | 10 md ÷ 100 md | 0.1 md ÷ 10 md | < 0.1 md |
---|
Gas | < 0.5 * | > 70° |
|
|
|
|
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Condensate | 0.69 ÷ 0.816 | 42° ÷ 74° |
|
|
|
|
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Light Oil | 0.816 ÷ 0.87 | 31.1° ÷ 42° |
|
|
|
|
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Medium Oil | 0.87 ÷ 0.93 | 20.7° ÷ 31.1° |
|
|
|
|
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Heavy Oil | 0.93 ÷ 1.0 | 10° ÷ 20.7° |
|
|
|
|
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Extra Heavy Oil (Bitumen) | > 1.0 | 4° ÷ 10° |
|
|
|
|
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* – with reference to air.
where box colors mean: and the ranges of properties in the table are only tentatively define the category based on the industry statistics and conventions, which vary over history and locations. |