Ownership of oil resources has always been one of the challenging issues at national and international levels. The acceptance of public ownership of oil reserves in the Constitution of Iran in the jurisprudential sense of “ Anfal” has led to the emergence of this notion by some of the oil industry's leaders and experts, that, apart from the service contract model, the use of other contractual oil models is contrary to the public ownership of oil resources. The precise examination of the status of public ownership of oil resources in the countries of Venezuela, Indonesia, Iraq and Iran on the one hand, and the assessment of the nature of each of petroleum contractual models and their application in these countries on the other, shows that contrary to what is perceived in Iran's oil industry, public ownership of oil resources does not constrain the use of participation method in the upstream sector of oil industry, but that the concession model is the only model contradicting the notion of public ownership of oil resources.