This report provides an overview of the oil and gas industry, examining its historical development, structure, and the key components of its supply chains. The report differentiates between the supply chains of petroleum products and natural gas, highlighting the differences in their delivery methods and operational processes. It also analyzes the characteristics of various types of companies within the industry, including National Oil Companies (NOCs), International Oil Companies (IOCs), and Government Sponsored Enterprises, assessing their roles and impacts. The report covers upstream, midstream, and downstream sectors, providing insights into the exploration, extraction, refining, and transportation of oil and gas. The document also explores the technological applications in midstream processes and the significance of the industry in maintaining industrial civilization. The analysis includes an assessment of the roles and impacts of different types of oil and gas companies in the market.