LUMINESCENCE LOGGING 



321 



content of different petroleums in a clay suspension. The clay suspension 

 was of such viscosity that oil drops did not move about in it. The petroleum 

 was carefully mixed with the clay suspension until a stable emulsion was 



600 



Fig. 4. Luminescence spectra. 1 — solution of petroleum in chloroform with a concen- 

 tration of 8 X 10"^ % ; 2 — the same with a concentration of 2 X 10"^ % ; 3 — undUuted 



petroleum. 



formed, this being checked visually under ultra-violet light. Suspensions 

 were prepared from two clays (light and dark) and from petroleum with 

 different intensities of luminescence. 



10 10"" IQ-S IQ-^ II 



C, % 



Fig. 5. Intensity of luminescence of a solution of petroleum in chloroform as a function 



of concentration. 



Applied geophysics 21 



