Why the Saudi oil attack is a ‘big deal’ that could be a ‘game changer’ in stock markets and crude prices

An intensifying Middle East conflict is threatening to throw the world’s energy market into disarray after weekend drone attacks destroyed parts of Saudi Aramco’s Abqaiq plant — one of the world’s largest processors of oil — and a separate nearby oil field.

On Saturday, the drone attacks, directed at Saudi Arabian oil facilities that account for nearly 10 million barrels of crude-oil production, resulted in massive plumes of black smoke emanating from the oil field, and a shutdown that could lead to about 50% of its production being at least...