Saudi Arabia holds the title as the world's largest producer and exporter of total petroleum liquids, and the country's national corporation, Saudi Aramco retains the most proven reserves and production of hydrocarbons worldwide. Only behind Russia as the largest crude oil producer, Saudi Arabia has an estimated 267 billion barrels of proven oil reserves, including 2.5 billion in the Saudi-Kuwaiti Neutral Zone, and 253 trillion cubic feet (Tcf) of proven natural gas reserves. Impressively, more than half of Saudi Arabia's oil reserves are sourced from only eight fields.
A reservoir engineer is concerned with underground oil and gas reserves, specifically finding the most efficient way to extract their resources. The reservoir engineer can work through all phases of a well’s lifespan, from helping petroleum geologists find well sites, through field development, planning, forecasting, testing and drilling. Their duties are varied and can include simulation and surveillance of the well, production forecasting, and development planning. Reservoir engineers are especially concerned with determining the economic viability of a well, finding out how much the well can produce, and making sure that the well is cost effective. They are also responsible for reporting reserve numbers to regulatory agencies. Reservoir engineers are usually petroleum engineers, however occasionally chemical or mechanical engineers can be trained for this position.