Lex Petrolea and International Investment Law: Law and Practice in the Persian Gulf offers readers a detailed analysis of jurisprudence on the settlement of upstream petroleum disputes between host states in the Persian Gulf and foreign investors. Dr Nima Mersadi Tabari considers the historical, political, and socio-economic roots of the existing frameworks and levels of protection offered to foreign investors. With particular focus on petroleum-related disputes, he initially delivers a comprehensive survey of the jurisprudence of international investment law and investment treaty arbitration. Following on from this, in three dedicated chapters, the author provides in-depth analysis of the legal regimes governing the matter in the major producers of the region: Saudi Arabia, Iraq, and Iran.A key resource for all professionals working on legal issues arising from foreign direct investments in natural resources, this book draws a detailed picture of the legal regime governing the upstream sector in the most important geographical region for the international oil and gas sector.