Tool marks

Tool marks are a class of borehole wall artefacts that can affect images.  They are the result of mechanical work against the borehole wall and include stabilizer grooves, sampling tool marks, cable slap and sidewall core sites.  They are usually easily recognised.  Not all of these artefacts are detrimental to interpretation as some can allow the removal of a thick mud cake allowing successful imaging of the formation to occur.


BOURKE, L. T., 1989.  Recognizing artifact images of the Formation Microscanner.  Paper WW, in 30th annual logging symposium transactions.  Society of Professional Well Log Analysts, 25.


LOFTS, J. C. and BOURKE, T. 1999.  The recognition of artefacts from acoustic and resistivity borehole devices.  In: LOVELL, M. A., WILLIAMSON, G and HARVEY, P. K. (eds.).  Borehole Imaging: Applications and Case Histories.  Geological Society Special Publication No. 159, 59-76.



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