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