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A common gamma-ray log records the total radiation and cannot distinguish between the radioactive elements, while a spectral gamma ray log (see below) can. For standard gamma-ray logs, the measured value of gamma-ray radiation is calculated from concentration of uranium in ppm, thorium in ppm, and potassium in weight percent: e.g., GR API = 8 ...
The formation evaluation gamma ray log is a record of the variation with depth of the natural radioactivity of earth materials in a wellbore. Measurement of natural emission of gamma rays in oil and gas wells are useful because shales and sandstones typically have different gamma ray levels.
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).
The first gamma ray source to be discovered was the radioactive decay process called gamma decay. In this type of decay, an excited nucleus emits a gamma ray almost immediately upon formation. [note 1] Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900, while studying radiation emitted from radium.
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.
WELLS, Maine — Members of the Wells Select Board voted unanimously on March 19 to have the town ... This map details how a developer hopes to build more than 100 new homes and about 40 new ...
WELLS, Maine — A local man is facing a charge of attempted murder. Emanuel Diggs, 22, of Wells, was arrested Monday, Dec. 11, a day after the state issued a warrant for his arrest, the U.S ...
Wells is on the southern coast of Maine, surrounded by Kennebunk to the northeast, Sanford to the northwest, North Berwick to the west, South Berwick to the southwest, and Ogunquit to the south. According to the United States Census Bureau , the town has a total area of 73.61 square miles (190.65 km 2 ), of which 57.55 square miles (149.05 km 2 ...