Abstract

Total worldwide geophysical expenditures increased 3 percent in 1972 to continue an upward trend started in 1971 after a sharp drop in 1970. The modest increase was due principally to rising expenditures in land seismic work for petroleum exploration. Expenditures for petroleum exploration declined for marine seismic work, for airborne surveys, and to a lesser extent for surface gravity/magnetic surveys. However, the total amount of work done--measured in land crew-months and marine line-miles--showed little change in 1972. Western Hemisphere work increased significantly in the U.S. and Canada in apparent response to energy shortages. This was offset by declines in Eastern Hemisphere work Of particular note is the continuing 5-year downward trend of marine seismic costs per mile. This can be correlated with the industry's increasing use of nondynamite methods and improved navigation systems that allow 24 hours/day operations at sea.

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