Geochemical prospecting seeks surface or subsurface evidence of vertical migration of hydrocarbons. One application is to directly determine the presence of oil and gas in the reservoir. The basic principles of geochemical methods were recently reviewed by Colin Barker (TLE, June and July 1999) and by Dietmar “Deet” Schumacher (TLE, March 2000). However, Barker's articles did not discuss the location/interpretation of surface geochemical anomalies that, for the explorationist, is a most interesting and important subject, and Schumacher's article mainly discussed the case of “apical” anomalies over oil and gas fields, that is not always the occurrence....

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