Rock Physics of Shale - Stanford University

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

Scale sonic and resistivity where 50 usec/ft equal 1 decade resistivity (ohm-m) 22 Gary Mavko – Stanford Rock Physics Laboratory
The method employs the overlaying of a properly scaled porosity log (generally the sonic transit time curve) on a resistivity curve (preferably a deep-reading tool). In water-saturated, organic-lean rocks, the two curves parallel each other and can be overlain, since both curves respond to variations in formation porosity; however, in either hydrocarbon reservoir rocks or organic-rich non-reservoir rocks, a separation between the curves occurs. The separation in organic-rich intervals results from two effects: the porosity curve responds to the presence of low-density, low-velocity kerogen, and the resistivity curve responds to the formation fluid. In an immature organic-rich rock, where no hydrocarbons have been generated, the observed curve separation is due solely to the porosity curve response. In mature source rocks, in addition to the porosity curve response, the resistivity increases because of the presence of generated hydrocarbons. The magnitude of the curve separation in no-reservoirs is calibrated to total organic carbon and maturity, and allows for depth profiling of organic richness in the absence of sample data. This method allows organic richness to be accurately assess in a wide variety of lithologies and maturities using common well logs.” 23 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: € Passey’s 1 Method of TOC Esti
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 and 62: Quartz and Calcite are more brittle
Page 63 and 64: Poisson’s ratio Young’s Modulus
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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