It's a naphthenic-type crude, useful for transformers and some metalworking oils but it needs severe hydrotreatment to make it suitable for applications where a paraffinic oil would be the choice.It's also high in sulphur which means it's not good for quenching oils without a lot of treatment to remove the sulphur.
tl;dr is that it needs a lot of treatment and that makes the end product expensive when compared to a light sweet crude like Brent,