Openhole Logging - Wireline Formation Evaluation | SLB

Wireline Openhole Logging

Advance your understanding to optimize reservoir performance

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Your reservoir, in full geologic detail

The ground truth for high-resolution information to address reservoir complexity and to guide and constrain modeling is conventional whole core. But, it’s obviously not practical to core and analyze the entire drilled well. Nor is the resolution and confidence of what can be interpreted from seismic data alone sufficient.

The industry’s recognized approach for efficiently acquiring representative information is wireline openhole logging, deploying sensors to measure all aspects of the reservoir in situ and in real time.

Get the answers you need for informed decision making and risk reduction from precise and accurate downhole logging measurements, delivered workflow-ready for interpretation and refining your reservoir model.

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MaxPULL high-pull wireline conveyance system

Wireline Conveyance

Integrated wireline and slickline systems for reliable, efficient conveyance.

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Formation evaluation characterizes rock and fluid properties based on downhole measurements, formation testing, and laboratory analysis services. Petrophysical analysis using a wide variety of measurements leads to an understanding of the reservoir and its detailed characteristics.

  • CMR-MagniPHI high-definition nuclear magnetic resonance (NMR) service
    High-definition NMR service

    Unlock the T₁ dimension to provide the most accurate lithology-independent porosity and fluids mapping for the smallest pores. View

  • Dielectric Scanner
    Dielectric Scanner
    Multifrequency dielectric dispersion service

    Acquire measurements that speak volumes. View

  • Integrated Wireline Platforms
    Integrated Wireline Logging Platforms
    Single toolstrings for standard, slim, and HPHT wells

    Get the complete picture of your reservoir and its fluid contents from accurately determined petrophysical properties measured by a single toolstring. View

  • Litho Scanner High-definition spectroscopy service
    Litho Scanner
    High-definition spectroscopy service

    Unlock the key elements of your reservoir—including stand-alone TOC. View

  • MR Scanner expert magnetic resonance service
    MR Scanner
    Expert magnetic resonance service

    Obtain NMR measurement of porosity, permeability, and fluid volumes independent of the rock matrix. View

  • Rt Scanner Triaxial Induction Service
    Rt Scanner
    Triaxial induction service

    Calculate vertical and horizontal resistivity from direct triaxial induction measurements and solve for formation dip to account for anisotropy and thin beds. View

  • Pulsar Multifunction Spectroscopy Service
    Multifunction spectroscopy service

    Attain comprehensive formation evaluation in cased hole: one run, one tool. View

  • ThruBit Through-the-Bit Logging Services
    Through-the-bit Logging Services
    Through-the-bit logging services

    Log a full wireline measurement suite beyond gravitational descent. View


Measurements at scales from pores to sedimentary basins are analyzed and interpreted to develop micro- and macrogeological models. Knowledge of local and field-wide structure and variability helps to achieve optimal reservoir contact and guide well paths to avoid hazards.

  • FMI Fullbore Formation Microimager
    Fullbore formation microimager

    Image formation microresistivity in water-based mud, including deviated and horizontal wellbores. View

  • FMI-HD High-Definition Formation Microimager
    High-definition formation microimager

    Visualize water-based mud environments in high fidelity and clarity. View

  • OBMI Oil-Based Microimager tool
    Oil-based microimager

    Visualize the reservoir with microresistivity imaging in oil-based, nonconductive, and invert-emulsion mud systems. View

  • Quanta Geo Photorealistic Reservoir Geology Service
    Quanta Geo
    Photorealistic reservoir geology service

    Truly visually represent formation geology with core-like images in oil-based mud. View

  • UBI Ultrasonic Borehole Imager
    Ultrasonic borehole imager

    Analyze fractures, stress, and borehole stability with advanced borehole imaging independent of mud type. View

  • ThruBit Through-the-Bit Logging Services
    Through-the-bit Logging Services
    Through-the-bit logging services

    Log a full wireline measurement suite beyond gravitational descent. View


Rocks have a wide range of stiffness and strength and are exposed to variable stresses during drilling, completion, and production. Downhole acoustic measurements and laboratory core analysis provide input for geomechanical modeling to efficiently develop, produce, and ultimately abandon reservoirs.

  • Sonic Scanner Acoustic Scanning Platform
    Sonic Scanner
    Acoustic scanning platform

    Gain acoustic insight to anisotropy and formation geomechanics in wells at any angle. View

  • DSI Dipole Shear Sonic Imager
    Dipole shear sonic imager

    Fully characterize compressional, shear, and Stoneley waves. View

  • ThruBit Through-the-Bit Logging Services
    Through-the-bit Logging Services
    Through-the-bit logging services

    Log a full wireline measurement suite beyond gravitational descent. View

Reservoir Engineering

Reservoir engineering provides an understanding of fluid flow and phase behavior at all scales, for all fluids, and in all geological settings. Formation pressure measurement, downhole fluid sampling and analysis, and laboratory PVT analysis are used to build a picture of reservoir potential and predict future performance.

  • Saturn 3D Radial Probe for Fluid Sampling and Pressure Measurement
    3D radial probe

    Perform formation testing where previously not possible. View

  • InSitu Fluid Analyzer Real-Time Downhole Fluid Analysis System
    InSitu Fluid Analyzer
    Real-time downhole fluid analysis system

    Describe the entire reservoir fluid system in real time by scanning fluid properties downhole in different reservoir zones. View

  • Formation evaluation sampling
    Wireline Formation Testing
    Formation pressure, downhole fluid analysis, fluid sampling, and sidewall coring

    Determine how fluid behaves in the reservoir by collecting data at reservoir conditions. View

  • Sidewall core samples
    Sidewall Coring
    The efficient way to sample your reservoir

    Understand the reservoir rock and its fluid contents. View

  • Quicksilver Probe Focused Fluid Extraction
    Quicksilver Probe
    Focused fluid extraction

    Collect virtually contamination-free fluid in a fraction of the time. View


Large-scale sensing finds reservoirs in all types of environments, providing the basis for a 3D reservoir model with physical properties at all scales. Geophysics provides the “big picture,” while wellbore-scale seismic and petrophysical data deliver formation understanding in detail.

  • Borehole Seismic
    Integrated borehole seismic system

    Image around the borehole in high resolution with integrated borehole seismic services. View

  • Crosswell seismic imaging
    Crosswell seismic imaging service

    Achieve seismic imaging at the reservoir scale. View

Black and white photo of person near wireline spool.

Celebrating 55 Years in Norway

On July 16, 1966, the first two Norwegian employees of Schlumberger in Norway rigged up the new cable bridle on the logging unit on the Ocean Traveler rig to log the first well ever drilled in the Norwegian Continental Shelf, Well 8/3-1. Our journey of growth continues as we transition to meet the energy demands of the future.