Rock Physics of Shale - Stanford University

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$Drilling-induced tensile wall-fractures - Stanford University$

Brittleness: Composition ⎛⎛ ⎜⎜ ⎝⎝ Issue: How to measure brittleness from logs? Calcite and quartz each have distinctly different Vp/Vs than shale. However when added, they might cancel changes in Vp/Vs. VP VS ⎞⎞ ⎟⎟ ≤ ⎠⎠ sand V ⎛⎛ ⎞⎞ P ⎜⎜ ⎟⎟ ≤ ⎝⎝ VS ⎠⎠ shale V ⎛⎛ ⎞⎞ P ⎜⎜ ⎟⎟ ⎝⎝ VS ⎠⎠ limestone Increasing stiffness Increasing Vp/Vs Increasing gas Increasing porosity 62 Gary Mavko – Stanford Rock Physics Laboratory
Poisson’s ratio Young’s Modulus (GPa) quartz .07 94 calcite .31 79 dolomite .23 121 clay .35 36 rubber ~0.48 .01 copper 0.34 117 steel 0.30 210 glass 0.2-0.3 50-90 cork ~0 0.03 63 Gary Mavko – Stanford Rock Physics Laboratory
Page 1 and 2:
Rock Physics of Shale Gary Mavko -
Page 3 and 4:
What is Shale? Wentworth Scale of g
Page 5 and 6:
Organic-Rich Shale 5 Gary Mavko - S
Page 7 and 8:
What the heck is shale porosity/per
Page 9 and 10:
Porosity in Organic-rich Shale Foss
Page 11 and 12: Porosity in Organic-rich Shale . Lo
Page 13 and 14: Kerogen Moduli Inferred from Nanoin
Page 15 and 16: Example Compositions Mineral Barnet
Page 17 and 18: What parameters are we interested i
Page 19 and 20: What parameters are we interested i
Page 21 and 22: € Passey’s 1 Method of TOC Esti
Page 23 and 24: The method employs the overlaying o
Page 25 and 26: What’s the Shale-Gas Geoscience Q
Page 27 and 28: Shale Anisotropy 27 Gary Mavko - St
Page 29 and 30: Why Worry about Anisotropy? • It
Page 31 and 32: Sources of Anisotropy 31 Gary Mavko
Page 33 and 34: Fabric Anisotropy Here we show a ph
Page 35 and 36: Fabric Anisotropy Gneiss horizontal
Page 37 and 38: Shale Anisotropy Sources of shale a
Page 39 and 40: Deposition/Compaction Hypotheses
Page 41 and 42: Velocity Anisotropy from Thinly Lay
Page 43 and 44: Velocity Sensitivity to Effective P
Page 45 and 46: Lab data: Anisotropy vs. Effective
Page 47 and 48: Vertical Fractures 47 Gary Mavko -
Page 49 and 50: Fracture Permeability High Pp Natur
Page 51 and 52: Fractures/ Brittleness 51 Gary Mavk
Page 53 and 54: Brittleness: Examples Low Clay (tig
Page 55 and 56: Fractures Usually Prefer Certain Li
Page 57 and 58: Predicting/measuring Brittleness
Page 59 and 60: Quantifying Brittleness In terms of
Page 61: Quartz and Calcite are more brittle
Page 65 and 66: Modeling 65 Gary Mavko - Stanford R
Page 67 and 68: € Modeling Composition Elastic Mo
Page 69 and 70: Examples Quartz Calcite Dolomite Cl
Page 71 and 72: Example computed trends 71 Gary Mav
Page 73 and 74: Gary Mavko - Stanford Rock Physics
Page 75 and 76: Bandyopadhyay, 2009, Ph.D. disserta
Page 77 and 78: Bedding-Plane Microcracks Adding ho
Page 79 and 80: Bedding-Plane Microcracks Velocitie
Page 81 and 82: Vertical Fracture Modeling Interpre
Page 83 and 84: Vertical Fracture Modeling -- NMO T
Page 85 and 86: Issues • Shale lab data are spars
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Rock Physics of Shale - Stanford University

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