This literature review proposal examines the factors influencing marketing effectiveness within Shell Nigeria, focusing on the oil and gas sector. The report explores the significance of marketing, the competitive market landscape, and the impact of operations and supply chain management. It highlights the crucial role of effective marketing in a saturated market, emphasizing the need for businesses to differentiate themselves. The study delves into market competition, analyzing different market structures like oligopoly, and the challenges faced by Shell Nigeria. Furthermore, it investigates the relationship between supply chain management and marketing effectiveness, emphasizing its influence on customer service, cost reduction, and financial performance. The proposal outlines the research questions, objectives, and framework for further investigation into these critical factors, aiming to understand how Shell Nigeria can optimize its marketing strategies to gain a competitive advantage and sustain success in the dynamic business environment.