Well logs are indispensable sources of subsurface information in exploration, appraisal, and development. The term “advanced logs” here refers to well logs other than the conventional quad combo. They involve, but are not limited to, nuclear magnetic resonance (NMR), image, nuclear, spectroscopy, triaxial induction, etc. Some of these logs provide direct access to critical petrophysical, geochemical, geomechanical, and geologic information that is either unavailable in quad combo or requires delicate calibration and modeling in postwell analysis, while the others allow faster logging speed, less logging uncertainty, or higher data resolution. Advanced logs and subsequent interpretation give a more reliable and...

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