Defining bubble-point pressure

[pet_spec]

I am given the reservoir data:

Pressure (psig) GOR(scf/STB)
500 29
1000 58
2000 116
3000 173
4000 231
4500 250
5000 250
5500 250
6000 250

Is bubble-point pressure here is 4500 psig as after that point GOR starts to decrease as gases evolve from solution?

[DAH7542]

For the given data set Pb = 4500 psig since the GOR remains constant and equal to Rs for pressures greater than Pb.

[i-anuar]

plot data and draw lines through. on intersection should be Psat. quite big pressure steps, check with production data if you have and correlations for P&T of your reservoir...