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A Study on Slowness Time Coherence Application and its Characteristics from Sonic Log Experiment in Model Holes  

Kim, Yeong-Hwa (Department of Geophysics, Kangwon National University)
Zhao, Weijun (Department of Geophysics, Kangwon National University)
Publication Information
Geophysics and Geophysical Exploration / v.10, no.4, 2007 , pp. 299-307 More about this Journal
Abstract
Slowness time coherence (STC) technique has been applied to 3-receiver slim hole sonic log using 3 NX sized concrete model holes of different physical properties. We analyzed the effects of different source center frequencies on the wave forms, their amplitude spectra, and their STC results. We could determine the sonic velocity of each mode accurately by the application of STC method with the semblance projection and efficient selection of center frequency. Theoretical model and experimental model hole studies indicate that 4-receiver condition is the most ideal for STC in near surface slim hole sonic log. The result also indicates that favorable STC result can be obtained from three-receiver sonic log provided with the help of the first arrival picking method.
Keywords
sonic wave; STC; source frequency; model experiment; slim hole log;
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