Built to withstand high-pressure, high-temperature (HPHT) environments typical of deepwater and deep exploratory wells. Primary Applications in Oil & Gas
Using specialized hinged pad combinations, the NGI hardware delivers up to in standard openhole diameters. This near-total visualization leaves virtually no "blind spots," allowing geologists to confidently map dipping beds and identify localized sedimentological structures. Quanta Geo Photorealistic Reservoir Geology Service | SLB
| Generation | Primary Technology & Examples | Key Limitations | | :--- | :--- | :--- | | | Legacy OBM-adapted imagers (e.g., OBMI) | Provided a technological step forward but often produced images with low resolution and limited borehole coverage. | | Second-Generation (NGI/Quanta Geo) | High-frequency microresistivity imager (introduced 2014) | Represents a revolutionary advance with 192 sensors and ~98% coverage, delivering "photorealistic" images. | | Third-Generation (LWD) | Dual-physics imager (e.g., TerraSphere™, introduced 2019) | Integrates electromagnetic and ultrasonic measurements for real-time high-resolution imaging while drilling. Side-by-side comparisons show its resolution is significantly higher than previous-generation LWD imagers and comparable to wireline tools. | schlumberger ngi tool
To learn more about how NGI data can enhance your formation evaluation, you can explore detailed case studies on SLB.com .
A horizontal well targeting a 10-foot porous dolomite zone. Surrounding the target are dense, non-porous limestone and anhydrite. Quanta Geo Photorealistic Reservoir Geology Service | SLB
The NGI tool overcomes this fundamental challenge through advanced measurement physics:
The Schlumberger NGI tool is a powerful logging instrument that provides a more detailed understanding of subsurface formations and fluids. With its nuclear and geochemical measurements, high-resolution imaging capabilities, and real-time data acquisition, the NGI tool is an essential tool for operators looking to optimize their drilling and completion strategies, improve reservoir characterization, and increase overall asset performance. As the oil and gas industry continues to evolve, the Schlumberger NGI tool is poised to play a key role in unlocking subsurface insights and driving innovation. Surrounding the target are dense
Tx control for individual pads allows for real-time optimization in varying borehole conditions.
Calibration followed the established Schlumberger Natural Gamma Spectrometry (NGS) protocol, using a five‑window spectroscopy method and a dedicated calibration pit in Clamart, France. Data were processed on‑site with the Schlumberger Ideal’ software package, just after raw data were downloaded from the tool.
While specific configurations can vary based on tool generations and modular combinations, the NGI tool typically boasts the following technical parameters: