As Canadian oil production zooms to 1,000,000 barrels a day (with an annual gross production revenue around the $1,000,000,000 mark) and new drilling footage sets another record, the nation's oil explorers are looking ever farther afield for new reserves for the future. Targets for their geophysical and geological studies are the great sweeps of northern mainland, the little-known reaches of Hudson Bay and its encircling shores, and the slopes of the continental shelves off east and west coasts. Already, thousands of square miles of shoal sea areas have had their sub-surface formations probed by seismic detectors that trace the paths of shock waves, caused by detonating explosive charges as they pass through the varying densities of rock and hidden deposits. From the repeat signals geologists hope to discover the massive inverted saucers of rock under which rich pools of oil are gathered and trapped by their floatation properties. On the Grand Banks the first drill ship is at work, boring exploratory holes in the ocean bed through 40 fathoms of water. From this wave of exploration activity will come reserves of petroleum to feed the mighty industrial complex of North America and other bustling areas of the oil hungry world -- a future revenue for Canada that will have a tremendous effect on the national economy in years to come.