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One of the most helpful articles for understanding the NGI (Next Generation Integrated) tool, specifically the Platform Express integrated wireline logging platform, is Platform Express Integrated Wireline Logging Tool.
The NGI tool is a multifunctional logging instrument that uses nuclear reactions to measure various properties of subsurface formations. It is designed to provide detailed information about the formation's lithology, porosity, and fluid saturation.
It is often run as part of the Platform Express (PEX) or Sonic Scanner tool strings.
The NGI tool is most commonly deployed in production logging and well integrity surveys: