Schlumberger Ngi: Tool ((top))

Provides high-definition images with a vertical resolution of approximately 0.2 inches .

While the tool detects gas, interpretation can be tricky. A gas-filled void looks identical to an empty void (both ~0.2–0.3 g/cc). Distinguishing between them requires correlating with a casing collar locator (CCL) and temperature data (gas entry would cool the zone).

Quantitative measurements of potassium ( ), thorium ( ), and uranium ( Applications in Reservoir Evaluation schlumberger ngi tool

(NGI stands for Next-Generation Imager), is a specialized microresistivity tool designed for high-resolution borehole imaging in oil-based mud (OBM) environments. An insightful and recent paper (published ) featuring this technology is:

In the complex and high-stakes world of hydrocarbon exploration, the difference between a dry hole and a gusher often comes down to data. Specifically, it comes down to the ability to "see" through steel casing and cement to evaluate the formation fluids behind the pipe. For decades, this was a significant challenge. Conventional logging tools struggle to differentiate between formation fluids and the casing itself, often resulting in ambiguous data that leaves operators guessing. Specifically, it comes down to the ability to

Enter the .

Schlumberger NGI tool, widely recognized by its commercial name Quanta Geo Enter the . Schlumberger NGI tool

Reports generated from NGI data are critical for reservoir characterization in complex wells where water-based mud is not used.

| Output | Description | |--------|-------------| | | Flushed zone resistivity – helps identify movability | | Rt (deep) | True formation resistivity | | Resistivity profiles | 3–5 radial depths (e.g., 10, 20, 30, 60, 90 inches) | | Invasion correction | Uses simultaneous inversion to correct for mud filtrate invasion | | High vertical resolution | Typically 1–2 ft, sharper than older induction tools (e.g., DIT, DIL) |