Logging research in the U. S. S. R. is carried out in a number of institutes, including (1) in Moscow the All-Union Research Institute for Nuclear Geophysics and Geochemistry, the I. M. Gubkin Institute for the petrochemical and Gas Industry, and the All-Union Scientific Research Institute of Geophysics (VNII) in various branches of these institutes outside of Moscow, as for example the Volga-Ural Branch of VNII. International conferences on well logging were held in Poland in 1962 and in 1965. A U. S. exchange delegation visit to the Soviet Union in 1965 included many aspects of well logging. From these meetings and the published Russian language literature on well logging, the author has compiled a review of recent developments in well logging in the U. S. S. R. The principal topics covered in this review are acoustical and nuclear logging methods and log interpretation. Acoustic logs are used in open and cased holes in much the same way as in the U. S. - acoustic velocity logs for porosity; acoustic amplitude logs for studying the elastic properties of rocks, for fracture location and for indicating cement bonding of casing. A variety of radioactivity logs are in widespread use. The gamma-gamma log has been developed primarily for evaluation of cement behind pipe and in minerals prospecting; it is used to a lesser extent for formation density determination. Pulsed neutron logs are in widespread use and are run in both open and cased holes. Log interpretation work includes studies of high salinity formation waters and high salinity muds, identification of fractured reservoirs, and the use of computers for log analysis. Computers are used in gamma-ray log interpretation; to provide a lithologic log from the combination of several logs; and by means of "self-learning" programs to make statistical analyses of suites of logs for providing various geological and geophysical parameters.

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