Well logging is a continuos qualitative and quantitative analysis of underground formations and their interstitial fluids. The purpose of the analysis is to forecast the outcome of well production tests, to correlate physical properties of rocks and fluids encountered in different wells in the search for fluids, and to define lithologic bodies.
Surface Methods
Surface well logging always requires wellbore samples in some form as a basis for logging. The accuracy and reliability of surface methods, therefore, depend on sampling methods. Surface samples may be in the form of bit cuttings and/or cores. Bit cuttings are circulated to the surface with the drilling fluid, whereas cores are unaltered samples of rocks penetrated by the core bit, on using specialized drilling assemblies.
Bit cuttings and cores are used for qualitative evaluation of lithology and fluid saturation while the hole is being drilled. Cores are also used for detailed quantitativepetrophyscial evaluation by engineers...
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Chilingar, G.V. et al. (1988). Well logging . In: General Geology. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30844-X_115
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