Schlumberger Ngi Tool |work|

Standard tools use coaxial antennas (loops parallel to the tool axis). The uses a combination of coaxial and tilted antennas. By measuring the phase shift and attenuation of EM waves as they pass through different geological layers, the tool calculates anisotropic resistivity (horizontal and vertical resistivity, Rh and Rv).

Below is a structured paper outline/abstract for a technical study involving the NGI tool. schlumberger ngi tool

| Application | How NGI Helps | |-------------|----------------| | | Corrects for non-clay radioactivity (e.g., K-feldspar, mica) | | Source rock identification | High Uranium indicates organic matter | | Clay typing | Th/K ratio distinguishes swelling vs. non-swelling clays | | Unconformity detection | Uranium enrichment below unconformities | | Heavy mineral zones | Thorium peaks (monazite, zircon) | | Borehole environmental correction | Uses near/far ratio to correct for mud weight, standoff | Standard tools use coaxial antennas (loops parallel to

The NGI operates on the principle of . Water, oil, and gas have distinct relative permittivities (dielectric constants) at high frequencies: Below is a structured paper outline/abstract for a

7: Oxidizing environment (weathered)

The NGI tool is a multifunction, pulsed-neutron device. At its core, the tool utilizes a high-output pulsed-neutron generator (PNG) to bombard the formation with high-energy neutrons. These neutrons interact with the formation matrix and fluids, resulting in two measurable phenomena: gamma rays produced from inelastic scattering and gamma rays produced from neutron capture.