Four case histories are described briefly, in which electrical methods provided information of critical value that could not have been obtained as effectively by any other method: resistivity sounding in the Atlantic basin of Gabon, West Africa; dipole sounding in the Caspian Sea; telluric survey in the Hodna basin, Algeria; and telluric survey at N'Daminze, Gabon, West Africa. Reasons why the U.S. petroleum industry makes little or no use of surface electrical methods are discussed. It is concluded that these methods could serve the industry well, provided that the right amount of the right kind of field process is is used by the right kind of personnel. Large companies seem to have difficulty tailoring their programs to the technical requirements of these methods.

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