Different wells produce very characteristic product that's hard and expensive to mask. You could tell it from API gravity and sulphur content, among other thing

Different wells produce very characteristic product that's hard and expensive to mask. You could tell it from API gravity and sulphur content, among other things. See: https://en.wikipedia.org/wiki/List_of_crude_oil_products https://en.wikipedia.org/wiki/List_of_crude_oil_products So I don't see how you could economically camouflage crude oil from relatively simple chemical tests.