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    Permeability characterization of Schrader Bluff Sands using artificial neural networks

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    Author
    Deshpande, Aditya U.
    Keyword
    Oil sands
    Oil reservoir engineering
    Heavy oil
    Petroleum reserves
    Metadata
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    URI
    http://hdl.handle.net/11122/12800
    Abstract
    "Permeability is a fundamental and often difficult to predict property of any reservoir. This is especially true for unconsolidated formations where any type of physical permeability measurement is difficult. This study develops a more detailed picture of reservoir permeability by generating continuous predicted permeability logs for the Schrader Bluff sands. Schrader Bluff sands are a medium heavy oil reservoir currently produced from the Milne Point oil field on the Alaska North Slope (ANS). A total of about 400 ft of core samples from two Milne Point wells were analyzed using a probe permeameter. These data were then integrated with available permeability data and used along with electric well log data for training an Artificial Neural Network to obtain continuous predicted permeability logs. The predicted data were then used to make Modified Lorenz Plots to study the flow unit behavior and to identify possible flow units. A similar dual approach that includes both probe permeameter measured and predicted permeability data can be used for flow unit characterization in other reservoirs with deficient permeability datasets. This approach would be especially useful for permeability characterization of unconsolidated or semiconsolidated reservoirs"--Leaf iii
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2009
    Table of Contents
    1. Introduction -- 2. Background -- 2.1. Introduction to the Schrader Bluff oil pool -- 2.2. Flow unit behavior -- 2.3. Challenges associated with measuring the permeability of the Schrader Bluff sands -- 2.4. Methods of permeability measurements -- 2.5. Direct measurement using a probe permeameter -- 2.6. Permeability prediction using strict mathematical relationships with well logs -- 2.7. Multiple variable regression (MVR) methods for calculating permeability -- 2.8. Using articial neural networks (ANN) to predict permeability -- 3. Methods -- 4. Results -- 4.1. Selection of well logs for analysis -- 4.2. Neural network model training testing and application -- 4.3. Final correlation (R²) values -- 4.4. Cross plot analysis -- 4.5. Flow unit behavior -- 4.6. Possible sources of error -- 5. Discussion -- 5.1. Permeability measurement and prediction -- 5.2. Flow unit behavior -- 5.3. Applications of this study to Schrade Bluff Sands and other reservoirs -- 6. Conclusions and recommendations -- Appendices.
    Date
    2009-05
    Type
    Thesis
    Collections
    Engineering

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