Basic Petrophysics
Transcript of Basic Petrophysics
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Basic Petrophysics
Lecture Presentation
Carlos Torres-Verdín, Ph.D.Assistant Professor
PGE368Fall 2001 SemesterSeptember 21, 2001
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Basic Pore Space Properties
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Definition of Porosity
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Range of Porosity Values
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Range of Porosity Values
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Trends of Porosity
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Porosity vs. Grain Diameter
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Porosity vs. Depth
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Porosity vs. Depth
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Porosity of a Sphere Packing
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Types of Sphere Packing
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Variations in Grain Size
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Porosity of Sphere Packings
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Fluids in the Pore Space
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Fluids in the Pore Space
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Permeability
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Methods Used for Measuring Permeability
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Effect of Grain Size and Shape on Permeability
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Permeability Tensor
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Spherical Permeability
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Tensor vs. Scalar
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Permeability Trends
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Permeability vs. Porosity
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Permeability vs. Porosity and Grain Size
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Permeability vs. Pore Size
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Shale Content Reduces Permeability
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Summary
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Absolute and Relative Permeability
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Pressure Dependence of Permeability
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Specific Internal Surface
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Specific Internal Surface
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Pore-Filling Kaolinite
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Surface Area of Common Rock Types
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Surface-to-Volume Ratio
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Relationship Between Porosity, Specific Surface,and Tortuosity
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Relationship Between Porosity, Permeability, and Specific Surface Based on Models
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Fundamentals of Capillary Pressure
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Capillarity and Pore Diameter
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Capillary Pressure Curves
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Capillary Pressure Curves
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Capillary Pressure Curves vs. Permeability
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Directions of Saturation Change
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Capillary Pressure Curves: Water-Wet and Oil-Wet
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Capillary Pressure Curves
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Summary
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Summary
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Acknowledgements
• Baker Atlas