Lol, a large part of their non oil exports is actually oil based chemical industry.
That's actually a pretty good thing for them. A large number of countries with vast resources are in shitty conditions, probably because they focus on just selling off their resources instead of investing into refining and processing those same resources. Which would give them a skilled workforce they can transfer into other refining and processing industries, which makes them less susceptible to resource pricing shifts. A mechanical engineer is a mech. engineer whether they're working on machines that refine oil or glass or metal or whatever else. With a little more training, they can shift into further afield industries that someone who's just been working on the oil rigs for 10 years would take a lot more training to do.
That, and even if and when we shift out of oil-based energy, we'll still probably use (what little is left) of the oil in the ground for chemical industry. Plastics, solvents, chemical reactants in general, etc.
AND the further into the chemical chain they travel, the more adaptable it is to different feedstocks. A chemical is a chemical regardless of the origin, but if your entire industry is focused on acquiring and refining the feedstock, then a shift to plant-based oils would be *very* difficult. But if your industry is more focused on processing the refined chemical output, then if the chemical output is the same as the oil-based chemicals, it's not as hard to shift to using those plant-based. For example.