The petroleum industry has been interested for many years in finding some way of directly detecting the presence of buried hydrocarbons by making observations or measurements on the earth’s surface. In the past, large amounts of money have been spent on the evaluation of some of the proposed direct methods. None of the methods, however, has been widely adopted for oil exploration in this country. Recently, interest in some of the “direct geochemical” methods has increased, and it appears that these techniques will be re-evaluated. The re-evaluation costs will be high, and great interest will be shown by the petroleum...
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