GES (Geological Evaluation System) is a geological and petrophysical interpretation software developed by GPT International. It is designed to help geoscientists and engineers analyze well log data, geological information, and reservoir properties for hydrocarbon exploration and reservoir evaluation. The software provides tools for formation evaluation, reservoir characterization, and well data interpretation.

Main Purpose

GES is mainly used for:

• Well log interpretation
• Petrophysical analysis
• Lithology identification
• Reservoir evaluation
• Hydrocarbon zone identification

It helps convert raw well log measurements into reservoir parameters used for field development and reservoir modeling.

Key Capabilities

1. Well Log Data Processing

GES allows users to import and process different types of well log data.

Supported logs typically include:

• Gamma Ray (GR)
• Resistivity logs
• Density logs
• Neutron logs
• Sonic logs
• Caliper logs

The software allows log editing, filtering, and correction before interpretation.

2. Petrophysical Interpretation

GES can calculate important reservoir properties such as:

• Porosity (ϕ)
• Water saturation (Sw)
• Shale volume (Vsh)
• Permeability
• Net pay thickness

These parameters help determine reservoir quality and hydrocarbon potential.

3. Lithology Identification

Using combinations of logs, GES can help determine rock types.

Common lithologies identified include:

• Sandstone
• Limestone
• Dolomite
• Shale

This is often done using cross‑plots and mineral models.

4. Cross‑Plot Analysis

GES supports cross‑plotting between logs such as:

• Density vs Neutron
• Sonic vs Density
• Resistivity vs Porosity

Cross‑plots help identify:

• Rock type
• Fluid type
• Reservoir zones

5. Zone and Layer Analysis

The software can divide the well into different zones or formations based on log responses.

For each zone, engineers can calculate:

• Average porosity
• Average water saturation
• Net reservoir thickness

This helps identify productive hydrocarbon zones.

6. Data Visualization

GES provides tools for visualizing data in log tracks and interpretation panels, allowing users to:

• Display multiple logs simultaneously
• Overlay interpretation results
• Identify reservoir intervals

Typical Workflow in GES

A typical geological evaluation workflow includes:

1. Import well log data (LAS or other formats)
2. Perform data quality control
3. Apply environmental corrections
4. Calculate shale volume
5. Estimate porosity
6. Calculate water saturation
7. Identify reservoir zones
8. Generate interpretation reports

Applications in the Oil and Gas Industry

GES is used in:

• Formation evaluation
• Reservoir characterization
• Exploration studies
• Development planning
• Petrophysical interpretation

✅ In summary:

GES (Geological Evaluation System) from GPT International is a software platform used for well log interpretation and reservoir evaluation, helping geoscientists determine rock properties, fluid saturation, and potential hydrocarbon zones from well data.

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