Rock Physics of Shale - Stanford University
Rock Physics of Shale - Stanford University
Rock Physics of Shale - Stanford University
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Summary<br />
• <strong>Shale</strong> is defined by particle size.<br />
• <strong>Shale</strong> can have a very large range <strong>of</strong> compositions.<br />
• <strong>Shale</strong> can have a large range <strong>of</strong> P- and S-wave velocities<br />
- Composition<br />
- Porosity<br />
- Effective stress<br />
- Compaction<br />
• <strong>Shale</strong> Vp/Vs depends on composition, especially relative<br />
amounts <strong>of</strong> clay, silt, organics, and carbonate<br />
• <strong>Shale</strong> can have a large range <strong>of</strong> anisotropies<br />
- Small if bioturbated<br />
- Large if a pronounced fabric<br />
- Silt and cementation can reduce anisotropy<br />
• In kerogen-rich shales, properties depend on composition, TOC,<br />
and maturity, and fracatures.<br />
84<br />
Gary Mavko – <strong>Stanford</strong> <strong>Rock</strong> <strong>Physics</strong> Laboratory
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