Schlumberger Ngi Tool ⚡

principle. It injects a high-frequency alternating current into the formation via capacitive coupling between two current electrodes. Resolution

Typically featuring four or more pads, the tool ensures high circumferential coverage of the borehole. schlumberger ngi tool

| Parameter | Value | |-----------|-------| | Frequencies | Dual-frequency (e.g., 100 MHz & 1 GHz) | | Depth of Investigation | Shallow (~1–2 inches, primarily flushed zone) | | Vertical Resolution | ~1 inch (25.4 mm) | | Measurement principle | Phase shift & attenuation | | Tool configuration | Hydraulically actuated pad (like FMI or micro-resistivity imagers) | principle

| Element | Primary Gamma Energy (keV) | Geological Indicator | |---------|----------------------------|----------------------| | Potassium (K-40) | 1460 | Feldspar, Mica, Illite clay | | Uranium (U-238 series) | 1760 (Bi-214) | Organic matter, authigenic minerals, seawater influence | | Thorium (Th-232 series) | 2610 (Tl-208) | Heavy minerals, detrital clays (Kaolinite, Chlorite) | | Parameter | Value | |-----------|-------| | Frequencies