Sad news is that the regime is so wacko that any investment will produce a loss even if you do find the resources touted in the article.
Better to get things of value from the bazaar.
Chances of oil onshore approx zero. Chances of gas @ Yemeni border about 5%, chances of piracy of offshore installations 100%.
May however eventually be of interests to the Saudis assuming that they have artisans there.
Have a nice day: Ag