Zone Grader

Zone Grader

This answer product deliverable provides the client with a complete interpretation to assist with geological, petrophysical and geomechanical analysis.

  • Input logs are a standard triple combo.

  • Acoustic compression slowness, and PE for lithology, are modeled using neural networks based on log responses from offset wells.

  • Zone Grader "cutoffs" are based on advanced petrophysical analysis performed in offset wells.

  • Zone Grader Component Outputs:

  • Shale Volume - Index of Brittleness

  • Porosity - Water Saturation

  • Resistivity - Permeability

  • Organic Shale (TOC) - Net Pay

  • Clay Volume

  • Porosity

  • Water Saturation

  • Permeability

  • Young’s Modulus

  • Poisson’s Ratio

  • Closure Stress (used as an input for Zone Tuner)

Zone Grader - Deliverable Example - Click to Enlarge

Zone Grader - Assumptions to Flag Pay

  • Clay Volume must be low.

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

  • There needs to be some porosity for reservoir storage.

  • Water saturation is shown as being below a threshold for a low water cut completion. 

  • The permeability cutoff to indicate reservoir rock that has the potential to flow commercial rates.

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We provide innovative formation evaluation solutions to the global petroleum industry using our proprietary Logging While Tripping (LWT) method. Combined with the Zone Grader and Zone Tuner interpretation analysis, Cordax helps you make the right decisions for your well.

See how Cordax can improve your operations and save you money by giving us a call or, sending a quick email. A team of experts are waiting to help you optimize the producibility of your resource.