Zone Grader Advanced 

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Zone GraderTM  Advanced 

This answer product deliverable provides the client with advance interpretation to assist with geological and petrophysical analysis as well as completion program design.

  • IInput logs are a standard triple combo.

  • Acoustic compression and shear slowness is modelled using the Composite Rock Model.

  • PE for lithology is estimated using neural networks based on log response from offset wells.

  • Zone Grader Advanced Component Outputs:

    • Shale Volume - Index of Brittleness

    • Index of Brittleness - Porosity

    • Porosity - Water Saturation

    • Resistivity - Permeability

    • Organic Shale (TOC) - Net Pay

    • Clay Volume

    • Index of Brittleness

    • Porosity

    • Water Saturation

    • Permeability

    • Organic Shale (TOC) - Net Pay

    • Clay Volume

Zone Grader Advanced - Deliverable Example - Click to Enlarge

Zone Grader Advanced - Assumptions to Flag Pay

  • Clay Volume must be low. The yellow coloring indicating potential reservoir rocks.

  • Reservoir rocks are usually more brittle than the surrounding shales. The Index of Brittleness highlights the more brittle rocks in the orange coloring.

  • There needs to be some porosity for reservoir storage. The green shading indicates intervals where the clay and kerogen corrected effective porosity is above a threshold to have sufficient storage capacity to flag a potential reservoir.

  • Water saturation flag is shown in the grey shading as being below a threshold for a low water cut completion. 

  • The permeability cutoff is indicated by the light orange track to indicate reservoir rock that has the potential to flow commercial rates.

  • The red shading indicates intervals where the conditions are met for the zone to be counted as "net pay".