: The NGI-X utilizes multiple pads (A, B, C, D) to ensure high borehole coverage, which is critical for identifying natural and induced fractures .
Optimized to capture formation changes down to a scale of tens of centimeters.
The NGI tool's primary mission is to provide an accurate "True Resistivity" ( Rtcap R sub t
The operator deployed the Schlumberger NGI tool on a Rotary Steerable System.
Enter the (Next-Generation Imaging). This article provides a comprehensive technical overview of the NGI tool, its architecture, how it compares to legacy tools like the ArcVision* and EcoScope*, and its critical role in modern geosteering. schlumberger ngi tool
Inform optimal well-completion designs and targeted hydraulic fracturing zones. 4. Unlocking Structural Geology and Geosteering
The tool represents a highly specialized evolution in wireline openhole logging technology. By merging the classic petrophysical science of natural gamma ray spectroscopy with high-definition azimuthal imaging, the NGI tool allows geologists and reservoir engineers to visually map elemental distributions directly across the borehole wall.
Uranium frequently precipitates alongside organic matter in low-oxygen depositional systems. By filtering out potassium and thorium, the NGI tool uncovers "computed gamma ray" anomalies, highlighting thin, highly localized sweet spots within unconventional organic shale plays. 3. Fractures and Fluid Migration Characterization
At high frequencies (megahertz to gigahertz), the measured dielectric permittivity is dominated by the water volume, because water molecules have a permanent dipole moment that aligns with the alternating electric field. Gas and oil do not. : The NGI-X utilizes multiple pads (A, B,
: Accurate imaging of the borehole helps in placing completion equipment more effectively, particularly in horizontal or highly deviated wells.
Fully combinable with other Schlumberger wireline tools, including gamma ray, neutron porosity, density, and sonic tools, allowing for a comprehensive, single-run logging suite.
The Schlumberger NGI tool has been successfully deployed in numerous wells around the world, with impressive results:
The Schlumberger NGI tool is an advanced induction logging instrument designed to measure the electrical resistivity of subsurface formations. Electrical resistivity is a foundational measurement in petrophysics; because hydrocarbons (oil and gas) are highly resistive while formation water is highly conductive, resistivity logs are essential for calculating fluid saturation and identifying commercial pay zones. Enter the (Next-Generation Imaging)
Analyzing the difference between shallow and deep resistivity curves to understand how deeply drilling mud has penetrated the formation, which provides clues about formation permeability.
The NGI operates on the principle of . Water, oil, and gas have distinct relative permittivities (dielectric constants) at high frequencies:
: The tool has been deployed globally, including a notable 2,000-meter interval acquisition in Australia's North Carnarvon Basin to support reservoir quality assessment. compares to newer tools like Quanta Geo at-bit imaging service? Microresistivity - Oil-Based Microimaging | SLB
: Data from the NGI tool is often fed directly into software like Petrel or Techlog to create 3D digital reservoir models. Comparison: NGI vs. Traditional Induction Traditional Induction Next-Generation (NGI/AIT) Coil Configuration Single transmitter/receiver pair Multiple, multi-spacing arrays Depth of Investigation Fixed (often just one) Multiple (e.g., 10, 20, 30, 60, 90 inches) Thin Bed Resolution Limited; often smears data High; resolves beds down to inches Data Correction Manual "chart-book" corrections Real-time automated software correction Conclusion