A chart showing the number of oil wells drilled over the world in comparison to the site of areas favorable for petroleum was prepared by the U.S. Geological Survey, Department of the Interior, in an attempt to summarize in a clear and simple manner for experts, planners, policy makers, and the general public all pertinent information concerning the global oil potential situation.
On the chart, the areas within the bars are proportional to the size of the total potentially oil-bearing areas of the various regions indicated, onshore and offshore to the 200-m water depth. The six blocks on the left of the chart correspond to the developed countries, i.e., U.S.A., USSR, Western Europe (including also the socialist countries), Canada, Japan, Australia, and New Zealand. On the right side of the chart are shown the developing countries or regions, i.e., Latin America, the African Continent, South and Southeast Asia, People's Republic of China, and the Middle East. The cumulative drilling in each of the regions or countries is shown by circles. Each circle represents 50,000 wells. In regions or countries where there are less than 50,000 wells, only a proportional sector of the full circle is shown.