Elastic parameters of rocks from well logging in near surface sediments |
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| Authors: | Jadwiga Jarzyna Maria Ba?a Adam Cichy |
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| Institution: | 1.Faculty of Geology Geophysics and Environmental Protection,AGH University of Science and Technology,Kraków,Poland |
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| Abstract: | Acoustic full waveforms recorded in wells are the simplest way to get the velocity of P, S, and Stoneley waves in situ. Processing and interpretation of acoustic full waveforms in hard formations does not generate problems with identification
packets of waves and calculation of their slowness and arrivals, and determination of the elastic parameter of rocks. But
in shallow intervals of wells, in soft formations, some difficulties arise with proper evaluation of the S-wave velocity due to the lack of refracted S wave in case when its velocity is lower than the velocity of mud. Dynamic approach to selection of a proper value of semblance
to determine the proper slowness and arrival is presented. Correlation between the results obtained from the proposed approach
and the theoretical modeling is a measure of the correctness of the method. |
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