Abstract: The interaction between oil and geopolitics is inevitable and persistent, which profoundly affect international oil prices fluctuations and national petroleum energy security. For a long time, international oil prices fluctuations has received much attention, from the government, enterprises and scholars. However, Few research studies have quantified the dominant driver of international crude oil price fluctuations from a geopolinomic perspective. To remedy this situation, this article attempts to analyse the pattern of international crude oil supplies and the dominant driver of international crude oil prices from the geopolinomic perspective. The analysis uses time series data from January 1994 to December 2011. Using ArcGIS classifications, this study depicts the general geopolitical pattern of crude oil supply. Next, the study conducts an empirical analysis of the dominant driver of international crude oil price fluctuations. The results demonstrate that the relationship between crude oil reserves and crude oil prices are not simply linear: reserves and prices are negatively correlated with each other in periods of financial crisis and positively correlated during periods of frequent geopolitical events. Further quantitative estimation indicates that international crude oil price fluctuations are largely driven by OECD crude oil demand; in particular, this is true of the countries led by the financial industry. As time goes on, non-OECD crude oil demand and crude oil suppliers have more influence in determining international crude oil prices. Finally, the dominant effect of financial factors on crude oil price fluctuations cannot be ignored.