Hi P1geon
I know I normally use USD 50 (which I now thinks to low).
Here is a table of INP SP assuming USD/AUD = 0.80 cents. NPV 10% and 75% control of the oil field.
Oil Price USD NPV 10% INP (75% control) SP
30 147 0.77
40 295 1.54
50 299 1.56
60 406 2.11
70 740 3.85
80 889 4.63
Notice it only at higher oil prices that the project is able to cover its huge drilling and production expense.
cheers
PC43