K(x) = 2.090751581·10^{-7}·x^3 - 0.005·x^2 + 30·x + 650
Kv(x) = 2.090751581·10^{-7}·x^3 - 0.005·x^2 + 30·x
kv(x) = 2.090751581·10^{-7}·x^2 - 0.005·x + 30
kv'(x) = 4.181503161·10^{-7}·x - 0.005 = 0 --> x = 1.195742250·10^4 Mbbl
1.195742250·10^4 / 23 = 519.9 Mbbl/Platform