just to be clear, the spawn chance of the refined wells depends on the spawn chance of regular wells
if you dial down regular oil, you will also get less refined oil wells
it doesn't work like the other resources
so, if you want more refined oil, you have to increase the amount of regular oil
then, adjust the refined oil sliders to determine what proportion of an oil field is refined oil
only the frequency and richness sliders work for refined oils, and they're both relative to regular oil
(i get that this is weird. but, it's how i want it to work in my own games)