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Spontaneous potential log, commonly called the self potential log or SP log, is a passive measurement taken by oil industry well loggers to characterise rock formation properties. The log works by measuring small electric potentials (measured in millivolts) between depths with in the borehole and a grounded electrode at the surface.
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Since 1994, Liesbeth Schlumberger has been the holder of the organ of the Église protestante unie de l'Étoile in Paris. She participates in several international competitions, as a participant or as a member of the jury, notably in 2010, in Chartres. Distinctions. 1985: First prize of the national radio competition of South Africa
Laurent Schlumberger exercised his pastoral ministry in the Paris region in Asnières-sur-Seine - Bois-Colombes ( Hauts-de-Seine ), then Nantes and Laval. He was elected president of the West region of the Regional Council of the Reformed Church of France in 1997. In 2006 he became pastor of the Foyer de Grenelle ( 15th district of Paris), a ...
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Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole. The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs ...