Although ctp is talking gas and not oil I have a question for...

Although ctp is talking gas and not oil I have a question for all our knowledgeable posters. When the price of oil is quoted, is this price at wellhead meaning freight is to be added before arriving at the refinery? I realise that each different crude price is adjusted according to its quality against that standard quote price, I read somewhere that although the WTA price is usually quoted even though only something like 2% of world deliveries are made at this price. Could anyone elaborate in the intricacies of this subject? At the very least it will provide some relief from the very repetitive posts of recent time (I won't mention names) here's hoping for some lively imput and diversion.