The genesis of electrical effectively logging resides with Conrad Schlumberger, who whereas a physics professor on the Ecole de Mines de Paris, France, conceived the thought of prospecting for metallic ore deposits through the use of their electrical conductivity to differentiate them from their much less conductive environment. One of the primary exams, in line with Schlumberger historians, was carried out in his bathtub, which was stuffed with numerous rocks for the experiment.
Conrad and Marcel Schlumberger had been born in Guebwiller in Alsace in 1878 and 1884 respectively . Alsace was then part of the German Empire. Their father, Paul, was descended from a rich cotton weaving household. Their mother and father determined to ship the brothers to Paris to be educated. Both Conrad and Marcel had been educated on the high engineering faculties in France; Conrad graduated from École Polytechnique in 1900, whereas Marcel graduated from École Centrale Paris in 1907. Conrad initially labored as a mining engineer at Rodez and Toulouse, France, and Marcel pursued a profession as a railway engineer earlier than taking part within the building of the primary French tanks throughout the first World War.
Conrad’s deal with making geophysical measurements grew to become all-consuming now, prompting him to resign his professorship at E?cole de Mines, Paris in 1923.
Conrad and Marcel spent the following three years conducting geophysical surveys in Serbia, Canada, South Africa, Congo and the USA, in addition to Romania, the place they made the primary mapping of an oil-productive salt dome utilizing electrical prospecting.
In 1926, they created the Socie?te? de Prospection E?lectrique, or “Pros” because it was nicknamed—the forerunner of the Schlumberger firm. Initially, the agency carried out floor prospecting for the metallic ore mining business however steadily prolonged its actions to embrace exploration of potential oil-bearing constructions.
To higher perceive measurements made on the floor, the Schlumberger brothers wanted to include resistivity data from deeper formations. Conrad had the thought of measuring resistivity instantly with probe, or sonde, run into boreholes drilled by way of the formations.
The first try to do that was made on September 5, 1927 by a staff led by experimental physicist Henri Doll, Conrad’s son-in-law. Measurements had been taken from sonde at numerous discrete depths in a 500-meter-deep effectively in Pechelbronn within the Alsace area of France. A brand new time period was coined to explain the outcomes of this multi-depth survey: it was known as resistivity effectively log.
This first log was little greater than a easy hand-plotted graph, however it marked a turning level within the historical past of oil exploration. Before then, engineers and scientists needed to depend on core samples or cuttings introduced up from boreholes to evaluate the composition of subsurface rocks. But the indications these gave had been extremely unreliable and ceaselessly missed oil zones. The log confirmed measurements taken in boreholes may assist determine the geological formations round them. It successfully enabled folks to “see” what was down the effectively—and since the resistivity recordings proved to be repeatable in neighboring wells, it was potential to allow exact correlation of formations throughout a complete subject.
International demand for the method, also referred to as electrical coring, grew quickly. By 1929, sub-surface logs had been being run in Argentina, Ecuador, India, Japan, the Soviet Union, Venezuela and the USA.
The similar 12 months, the USA’s first ever effectively log was carried out in Kern County, California.
Conrad Schlumberger died in Stockholm, Sweden, the 9 May 1936. His brother Marcel died in Val-Richer, France, the 9 May 1953. (Source and picture: Schlumberger/Society of Petrophysicists and Well Log Analysts)

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