All the oil is in Dhulbahante territory, that's what all the fighting, bribery, and pandering is about.
Somaliland, Puntland, the current TFG government and the old Siyaad Barre government have all sold the rights to that oil to different companies, so yeah the fighting will probably never end.
That is blatantly false claim. There is rumours of significant oil deposits in the Oodweyne block which is inhabited by HY.
I am sure @Bohol and @Saalax Bidaar can confirm more.
Potentially there may even be some oil in the Berbera basin (HA area) off the coastline as well, since some was found in the Yemen basin across the sea in Aden.