Universal Equipment for Borehole Ultrasonic Surveys
Many of the problems which are solved with present-day seismic prospecting methods require that investigations be carried out both on the earth’s surface and at considerable depths within the earth (in wells). Well surveys consist mainly of velocity measurements, though in some cases, the attenuation of elastic waves at ultrasonic frequencies is also measured [2, 3, 5]. At present, there are two principal types of ultrasonic (acoustic) logs: a) continuous logs, which permit a detailed study of the variation in velocity of longitudinal waves about a well bore; and b) full wave-form logging, which allows the determination not only of the velocity of longitudinal waves but also of that of transverse waves, and of the attenuation constants αL and αT.
KeywordsLongitudinal Wave Well Bore Vacuum Tube Seismic Wave Propagation Attenuation Constant
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- 1.E. V. Karus and V. B. Tsukernik, Ultrasonic pulse system for studying the mechanical properties of rocks, Izv. Akad. Nauk SSSR, Ser. Geofiz., No. 11 (1958).Google Scholar
- 2.E. V. Karus and M. V. Saks, Impulse ultrasonic logging, Vestn. Akad. Nauk SSSR, No. 4 (1961).Google Scholar
- 3.E. V. Karus, R. F. Frolov, and V. B. Tsukernik, Study of the elastic and attenuation properties of rocks penetrated by wells by the ultrasonic logging method, in: Present Status and Prospective Development of Geophysical Methods for Exploration and Development of Mineral Deposits, Gostoptekhizdat, 1961.Google Scholar
- 4.Yu. V. Riznichenko and V. A. Glukhov, On impulse ultrasonic seismic logging, Izv. Akad. Nauk SSSR, Ser. Geofiz., No. 11 (1965).Google Scholar
- 5.O. G. Sorokhtin, Multichannel impulse ultrasonic seismic oscillograph, Tr. Akad. Nauk SSSR, No. 6 (1959).Google Scholar