Geophysical well logging had its start in the Soviet Union at very nearly the same time as in the United States, over thirty years ago. The development of methods and interpretation in the two countries has been parallel, so that at present, many of the same procedures are used in both countries. There are also some differences, primarily on the emphasis placed on various logging methods. In the Soviet Union, spacing-type electric logs are used in preference to induction or guard type electric logs. Radation logging systems are highly developed, particularly the ones using neutron irradiation in the well, and are used in preference to sonic logs for determining porosity and fluid saturations. Well logging is also applied on a large scale in non-petroleum exploration, particularly in holes drilled in the development of coal fields.

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