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Formation Evaluation

Expanded Capabilities in the Industry’s Leading Petrophysical Analysis Solution

Geolog™ 20

Geolog 20 has been designed to provide easier access to data, with the ability to rapidly access your recently used wells with minimal mouse clicks.  In all views in Geolog 20, a new ribbon-like toolbar and menus with intuitive icons help guide users to the functionality they need to rapidly and accurately appraise and interpret their reservoir.  

Geolog 20 builds on the array of data visualization options provided in Geolog.  It delivers a new well progress plot which presents an interactive view of well activities against depth over time and provides a useful summary of the activity in any given well.  The automated reporting functionality in Geolog has been expanded to cover the Geosteering workflow, allowing the creation of detailed status reports using user-defined templates during geosteering operations. Geolog 20 also brings many additional petrophysical functionalities to meet today's market conditions.  

To learn more about the new features and enhancements, view the latest webinar, Introducing Geolog 20.


New Features

Why it matters

Deterministic Petrophysics 

  • Quickin and Determin rewritten as combined modules
  • Full Determin workflow in a single module
  • Buckles plot
  • Interactive Klein (butterfly) plot for the interpretation of thin beds
  • The combined deterministic petrophysics workflow replaces many individual modules with one process to rapidly perform all the steps of an analysis. 
  • The new interactive Klein plot allows faster interpretation in a thin bed environment.

New Analysis Modules for Unconventionals

  • Computation of kerogen type, maturity and potential as well as vitrinite reflectance and LOM
  • Calibration of Langmuir values from adsorption isotherm experiments 
  • Xplot with interactive adjustment of LOM for use in Delta LogR module
  • The modules and associated plots provide a more accurate interpretation of reservoirs and enhance the assessment of reserves in unconventional plays.

  • Ability to set uncertainties on any input parameter to a model and export an array of possible outcomes for logs
  • Expanded spectroscopy log support
  • Full uncertainty assessment in petrophysical interpretation requires an option to assess the effect of any input to an interpretation model (parameters and logs). The added uncertainty functionalities allow a complete handling of all input uncertainties, thus expanding one's understanding of the formation properties.
Major upgrade to Russian logging tool support
  • Environmental corrections combined as single module per log type and extra corrections added
  • Single and improved layering module with option to input user- defined bed boundary logs
  • Enhanced interpretation and functional transform workflows
  • Greatly expanded support for Russian tools and the addition of petrophysical methods to meet the specific requirements of the CIS market.
Core Analysis 
  • Filter expression added to CoreCorrect, CoreBuild and CoreModel views
  • General core analysis updates
    • New report templates
    • New modules for relative permeability averaging and oil recovery estimation using Buckley-Leverett frontal advance theory
  • Specialized core depth shift 
  • Saturation height models can be easily created based on filter expressions (e.g. building rock type specific models).
  • Core analysis functionalities are exposed in a more intuitive way.
  • Interactive core depth shifting tool helps ensure that when depth shifts are made, they maintain the depth context of individual core measurements.​


  • An interactive tool to assess the best predictors (best combination of inputs) for any given predicted log
  • Allows quantification and visualization of the performance of any combination of inputs for a given analysis. This powerful addition to the toolkit will help with the efficient classification of new data sets.


  • Reorganized workflow based on contractor and tool type   
  • Standardized log names
  • Enhanced tool pre-processing modules
  • Defaults for TE and TW for processing based on acquisition type
  • Combined modules for bound fluid interpretation
  • Reorganization improves ease of use and streamlines data preparation, inversion and interpretation, resulting in reduced time from loading of raw data to delivering and reporting results.
Full Waveform Sonic 
  • New tool support
    • Halliburton XAST, BAST and XSI
    • Schlumberger Thrubit Dipole and Thrubit Sonic
    • Added Stoneley mode support for HAL WaveSonic
  • The addition of support for these tools expands the processing capability of the latest generation of sonic tools (both wireline and LWD).
Borehole Images 
  • Pad-based electrical images which feature inter-pad gaps can now be transformed into complete images using a new image inpainting technique which employs a fast marching method to create data to fill in the gaps 
  • New SCAT and derivative plots for presentation and structural interpretation of image log processing results
  • Additional calculations in the fracture density module (P21, P32, P22, P33)
  • Module for output of primary and secondary porosity from image
  • Added support for Halliburton HFBI tool
  • The image inpainting module provides images suitable for input to further machine learning-based image processing routines.
  • SCAT and derivative plots offer useful visualization modes for the interpretation of geological sequences and structural trends.
  • The new module for fracture density estimation enables better quantification of in-situ formation fracturation.


  • Mud weight window generation versus deviation/azimuth
  • Borehole failure image output of breakout width and azimuth
  • Slip failure of weak bedding plane added to wellbore stability
  • Mud weight window versus azimuth and deviation enables a detailed analysis of wellbore stability at any given depth.
  • Estimation of slip failure due to weak bedding planes delivers a more accurate wellbore stability assessment.


  • Offset well logs on Geosteer section
  • Automated reporting functionality added to Geosteer module
  • Automated report generation provides valuable details during geosteering activities and enables the user to make faster operational decisions. 


  • Upgraded Python support to version 3.8
  • Added ability to generate and use compiled Python code (PYD files)
  • Access to Python version of cgglib database libraries (PYGG)
  • Expanded ability to use Python for customized programs and workflows.
  • Ability to directly connect to Emerson RMS™ to import geological surfaces into Geolog 3D model
  • Direct access to OSDU well data repository
  • Support for Petrel* 2020
(* a mark of Schlumberger)


  • Smoother workflow between petrophysicists and modelers
  • Emerson is fully committed to supporting the Open Group’s industry-wide OSDU (Open Subsurface Data Universe) initiative. Geolog 20 is Emerson’s first product release to offer the ability to connect and consume data from OSDU data stores, supporting the OSDU R1 and R2 releases.
  • Continuous upgrade to Petrel connectivity