Wireline Sonic Logs Reviewed

From this information some form of rock mass rating might be attempted. Since the borehole has been drilled, there might be a benefit from running a couple of wireline log measurements. The televiewer is an obvious choice due to its superior orientation but all wireline logs offer three big advantag...

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Bibliographic Details
Published inFastTIMES Vol. 25; no. 4
Main Author Chatfield, Marcus
Format Magazine Article
LanguageEnglish
Published Sheridan Environmental and Engineering Geophysical Society EEGS, FastTIMES 01.01.2021
Subjects
Boreholes
Compression waves
Critical path
Data processing
Longitudinal waves
Refracted waves
Rock mass rating
Time measurement
Transmitters
Travel
Travel time
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Summary:From this information some form of rock mass rating might be attempted. Since the borehole has been drilled, there might be a benefit from running a couple of wireline log measurements. The televiewer is an obvious choice due to its superior orientation but all wireline logs offer three big advantages; they are objective, there are no gaps and they are vertically precise; a log is one event. The compression wave transit time measurement (Figure 1) is based on the deduction of the travel time of a refracted wave from transmitter to receiver 1 (the closest receiver) from the travel time from transmitter to receiver 2 (20cm further away). In the example in Figure 3 all three logs are poor but the far receiver signal (right) has been submerged into the amplified road noise and is hardly visible…time to change the transmitter.
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ISSN:1943-6505