Determining the line between black oil and volatile oil isn't easy.

The line between volatile oil and retrograde gas is.

Usually Rs of 2000 to 3300 scf/stb increase with production below Pb

Gravity usually 40 API of higher

Color brown, orange or sometimes green

I'm going to encourage you a little, to help you get started. :)

I am going to encourage you a little, to help you get started :)
Since you looked us up and read the site enthousiastically, I would like to offer you a big discount.