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    Meta/Pyr: Program Documentation

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    Dhaffer Al-Mezhany
    This document describes a knowledge-based system called META/PYR for formation evaluation that accounts for the presence of pyrite. It provides equations to model pyrite's effect on resistivity and conductivity measurements in water and hydrocarbon zones. The equations are used to calculate corrected and uncorrected water saturation values. Sample input parameters and results are also shown.

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    Meta/Pyr: Program Documentation

    Uploaded by

    Dhaffer Al-Mezhany
    36 views2 pages
    This document describes a knowledge-based system called META/PYR for formation evaluation that accounts for the presence of pyrite. It provides equations to model pyrite's effect on resistivity and conductivity measurements in water and hydrocarbon zones. The equations are used to calculate corrected and uncorrected water saturation values. Sample input parameters and results are also shown.

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    4metapyr

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    This document describes a knowledge-based system called META/PYR for formation evaluation that accounts for the presence of pyrite. It provides equations to model pyrite's effect on resistivity and conductivity measurements in water and hydrocarbon zones. The equations are used to calculate corrected and uncorrected water saturation values. Sample input parameters and results are also shown.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    36 views2 pages

    Meta/Pyr: Program Documentation

    Uploaded by

    Dhaffer Al-Mezhany
    This document describes a knowledge-based system called META/PYR for formation evaluation that accounts for the presence of pyrite. It provides equations to model pyrite's effect on resistivity and conductivity measurements in water and hydrocarbon zones. The equations are used to calculate corrected and uncorrected water saturation values. Sample input parameters and results are also shown.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    of 2

    META/PYR

    A Knowledge Based System For Formation Evaluation


    Spectrum 2000 Mindware, Rocky Mountain House, AB, T4T 2A2 1-403-845-2527
    c. 'E. R. Crain, P.Eng.
    PROGRAM DOCUMENTATION
    ARCHIE Data with No Pyrite
    Resistivity of a Water Zone Ro = A * RW / (PHIe ^ M)
    Resistivity of a Hydrocarbonr Zone Rt = (A * RW / (PHIe ^ M)) / (Sw ^ N)
    Conductivity of a Water Zone Co = 1000 / Ro
    Conductivity of a Hydrocarbon Zone Ct = 1000 / Rt
    MODEL Pyrite as a Parallel Conductivity to Water Conductivity
    Conductivity of Pyrite Fraction Cpyr = 1000 / Rpyr * Vpyr
    Total Conductivity of Water Zone + Pyrite Cwet =:Co + Cpyr
    Total Conductivity of Hydrocarbon Zone + Pyrite Chyd = Ct + Cpyr
    Total Resistivity of Water Zone + Pyrite Rwet = 1000/ Cwet
    Total Resistivity of Hydrocarbon Zone + Pyrite Rhyd = 1000 / Chyd
    COMPARE Uncorrected to Corrected Saturation
    Uncorrected Saturation (with uncorrected resistivity) SwUnCorr = ((A * RW / ((PHIe ^ M) * Rt)) ^ (1/N))
    Corrected Conductivity CONDcorr = 1000 / Rhyd - Cpyr
    Corrected Water Saturation (pyrite removed) SwCorr = ((A * RW / ((PHIe ^ M) * 1000 / CONDcorr)) ^ (1/N))
    INPUT PARAMETERS
    PHIe Pyrite RW Rpyr Sw A M N
    frac frac ohm-m ohm-m frac frac frac frac
    0.12 0.05 0.02 0.5 0.5 1.00 2.00 2.00
    CALCULATED MODEL RESULTS
    Pyeite Ro Rt Co Ct Cpyr Cwet Chyd Rwet Rhyd Sw
    Volume Sw=1.0 Sw=0.50 Sw=1.0 Sw=0.50 mS/m Sw=1.0 Sw=0.50 Sw=1.0 Sw=0.50 UnCorr
    0.05 1.4 5.6 720 180 100 820 280 1.2 3.6 0.62
    0.00 1.4 5.6 720 180 0 720 180 1.4 5.6 0.50
    15 Jan 2008
    SwCorr = ((A * RW / ((PHIe ^ M) * 1000 / CONDcorr)) ^ (1/N))
    COND Sw
    Corr Corr
    180 0.50
    180 0.50

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