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Unmatched petrophysical analysis.

Geolog™ petrophysical packages are ideal solutions for effective geological and petrophysical analysis.


Determin is a comprehensive suite of individual deterministic modules ranging from environmental corrections to pay summary reporting.

The Determin Uncertainty add-on tool is used to quantify uncertainty associated with deterministic petrophysical interpretation. Based on Monte Carlo processing, Determin allows the user to assign uncertainties and uncertainty distributions to input variables and log values during analysis.

The full distribution of the petrophysical curves can be transferred from Geolog to the SKUA-GOCAD system for integration into a reservoir uncertainty analysis using the Reservoir Risk Assessment (Jacta™) module.

Determin modules are written in Loglan, Geolog’s powerful programming language. This comprehensive language gives log analysts the freedom to customize modules to meet their needs or incorporate local or proprietary algorithms. An option is available for work in interactive mode, enabling automatic updates of all relevant calculations when values are changed on screen.

An advanced generalized uncertainty module allows the user to run modules in Monte Carlo mode and assess uncertainties on the results of calculations.

mud gas module allows the computation of several output logs and flags, such as Pixler flags and gas ratio curves, using gas chromatography inputs. This provides key information about hydrocarbons present in drilled formations, and allows safer drilling by early detection of gas kicks and lost circulation.

Automatic parameter picking enabling an automated quick-look formation evaluation workflow to reduce time to results.


Multimin is an optimizing tool for statistically determining mineral and fluid characteristics and volumes from petrophysical data, such as logs, cores, XRD, and petrographic data. Embedded Monte Carlo Uncertainty analysis enables the petrophysicist to assess overall uncertainty on an analysis and identify variables with the greatest impact.


Integrated workflows allow Formation Test data to be rapidly loaded and displayed, and its quality automatically assessed using user-defined criteria.  Uncertainty on pressure gradients and fluid contacts can be assessed using Monte Carlo analysis.


The full waveform sonic processing module is used to process and interpret array sonic logs, from raw data to results, including slowness frequency analysis, dispersion correction and anisotropy processing for maximum stress direction determination. 


The NMR module enables vendor-independent, high-end processing, quality control, interpretation, and modeling of LWD and wireline NMR logs, including 2D NMR. With multiple inversion options, users are free to investigate relationships between the measured data and their reservoir.


A log-based Pore Pressure Prediction module provides tools to predict pore and fracture pressure profiles in wells based on logging data.  Following data preparation and compaction trend analysis, the Geolog pore pressure prediction module calculates hydrostatic pressure, overburden pressure, pore pressure, and fracture pressure in a single multi-tab program. The entire pore pressure prediction workflow is consolidated into one integrated Loglan, for optimal efficency.


Enables interpretation in high-angle/horizontal wells, providing greater understanding of the interaction between formation and fluids in wells of this type.


The Shale Gas Analysis module, together with geosteering, multi-mineral analysis and geomechanics capabilities, expands Geolog’s ability to successfully meet the unique challenges faced in shale plays.