Schlumberger Limited (ʃlœ̃bɛʁʒe; ˌslʌmbərˈʒeɪ) is the world's largest oilfield services company. Schlumberger employs over 110,000 people
of more than 140 nationalities working in approximately 80 countries. Its principal offices are in Houston, Paris

Paris

Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...

, and the Hague

The Hague

The Hague is the capital city of the province of South Holland in the Netherlands. With a population of 500,000 inhabitants , it is the third largest city of the Netherlands, after Amsterdam and Rotterdam...

.
Schlumberger was founded in 1926 by French brothers Conrad and Marcel Schlumberger

Schlumberger brothers

Conrad Schlumberger and Marcel Schlumberger were brothers from the Alsace region in France...

 as the Société de Prospection Électrique . The company recorded the first-ever electrical resistivity

Resistivity logging

Resistivity logging is a method of well logging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity. Resistivity is a fundamental material property which represents how strongly a material opposes the flow of electric current...

 well log

Well logging

Well logging, also known as borehole logging is the practice of making a detailed record of the geologic formations penetrated by a borehole. The log may be based either on visual inspection of samples brought to the surface or on physical measurements made by instruments lowered into the hole...

 in Merkwiller-Pechelbronn

Merkwiller-Pechelbronn

Merkwiller-Pechelbronn is a commune in the Bas-Rhin department in Alsace in north-eastern France.It is notable as the original home of oil sands mining....

, France in 1927.