Rock Physics of Shale - Stanford University
Rock Physics of Shale - Stanford University
Rock Physics of Shale - Stanford University
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Quantifying Brittleness<br />
In terms <strong>of</strong> overconsolidation ratio<br />
€<br />
OCR = σ V max<br />
σ V<br />
(only valid for layered rocks and max principal stress is vertical)<br />
€<br />
€<br />
€<br />
Brittleness:<br />
( ) OC<br />
( ) NC<br />
B = σ c<br />
σ c<br />
σ V Vertical stress<br />
σ V max Vertical stress at max burial<br />
= OCR b<br />
Nygard et al., Marine and Petroleum Geology 23 (2006) 201–212<br />
59<br />
Gary Mavko – <strong>Stanford</strong> <strong>Rock</strong> <strong>Physics</strong> Laboratory
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