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Estimating in situ rock mass strength and elastic modulus ...
Jun 21, 2018 · Knowledge of the strength and elastic modulus of a reservoir rock is important for the optimisation of a particular geothermal resource. The reservoir rock for many geothermal projects in the Upper Rhine Graben, such as those at SoultzsousForêts and Rittershoffen (both France), is porphyritic granite. High fracture densities (up to ~ 30 fractures/m) in this reservoir rock require that we ...
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Elastic properties of dry clay mineral aggregates ...
The bulk modulus values of the solid clay phase (K s) lie between 6 and 12 GPa and shear (μ s) modulus values vary between 4 and 6 GPa. A comparison is made between the accuracy of velocity prediction in shaley sandstones and claywater and claysand mixtures using the values measured in this study and those from theoretical models.
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[PDF] CSEG RecorderJune 2013A Gassmannconsistent rock ...
In this article, I discuss a new approach to the derivation of the rock physics template, or RPT. I first discuss pore space stiffness and use the BettiRayleigh reciprocity theorem to derive Gassmann's equation from the dry and saturated pore space stiffnesses. I then show empirically that the dry rock pore space stiffness stays constant over a range of porosities for a constant pore pressure.
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Density Of Cement | Density Of Sand | Sand Density ...
Alternative to Natural Sand is Manufactured Sand; MSand was used as having the bulk density of /m3 with specific gravity and fineness modulus around and, respectively. Densities of various sands are listed below, 1. Loose sand has a density of 1442 kg / m3 as it is a dry form of sand. 2. Dry sand itself has a density of 1602 kg ...
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Rock physics modelling of porous rocks with multiple pore ...
The substitution of the theoretical relationship into Kuster–Toksöz theory will generate the formulae for the bulk and shear moduli of multiple‐porosity dry rocks, which is named the multiple‐porosity variable critical porosity model. The new model has been used to .
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Rock Physics: Recent History and Advances | IntechOpen
Nov 16, 2019 · Gassmann's theory provides the bulk modulus in fluidsaturated rock (K Sat) as a function of the dry rock bulk modulus (K Dry), the bulk modulus of the solid phase (K s), that of the pore fluid (K f), and total porosity (ϕ). It assumes that the shear modulus is fluidindependent
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Curve Mnemonic Dictionary
Total Porosity: includes all forms of porosity, including that occupied by bound fluids, and is independent of rock and fluid materials and of environmental effects. Water Based Mud Coefficient, used to estimate Water Based Mud invasion when no Rxo. The extent to which the pore space in a formation contains gas.
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auralib/ at master · whamlyn/auralib · GitHub
Ks = Bulk modulus of mineral matrix: Gs = Shear modulus of mineral matrix: Kc = Bulk modulus of cementing mineral: Gc = Shear modulus of cemeting mineral: phi = porosity: phic = critical porosity: n = coordination number: Outputs: K_dry = bulk modulus of dry rock from Cemented Sand model: G_dry = shear modulus of dry rock from Cemented Sand ...
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Rational Rock Physics for Improved Velocity Prediction and ...
Dry frame rock bulk modulus can be derived either from laboratory measurement on core data, appliion of empirical relationships or effective medium theory [30–33], or direct calculation from log data by rewriting Gassmann's equation for frame rock bulk, which often generates negative (a physical impossibility) or unrealistically large ...
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(PDF) Dynamic versus static shear modulus for dry sand
The lowstrain maximumshear modulus value of Ottawa sand, G ref ¼ G max;σ 0 m ¼ 101 kPa ð1atmÞ, was estimated based on Hardin (1965), Drnevich and Richart (1970), Hardin and Drnevich (1972 ...
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Petrophysical Rock Physics Modeling: A Comparison of the ...
The conclusion is reached that the Geertsma dry rock bulk modulus model leads to significant overestimates of the effect of gas, particularly in porosities less than about 20% (DT of 85 microseconds per foot). Geertsma vs. Porosity. Mavko/Biot vs. Porosity. Nur vs. Porosity.
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Density
The porosity,, is the fractional pore volume of a rock (for example the black zone in the cross section of a sedimentary rock to the right). The total mass of a volume of rock, V T, is made up of the mass of the pore fluid, of density df, plus the mass of the matrix minerals of density dma. The density measured is the bulk density db.
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What Is Bulk Modulus? Definition, Formulas, Examples
Jan 27, 2019 · Bulk Modulus (K) = Volumetric stress / Volumetric strain. This is the same as saying it equals the change in pressure divided by the change in volume divided by initial volume: Bulk Modulus (K) = (p1 p0) / [ (V1 V0) / V0] Here, p 0 and V 0 are the initial pressure and volume, respectively, and p 1 and V1 are the pressure and volume measured ...
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Porosity estimation method in carbonate rock ...
Knowing the total porosity, spherical porosity and bulk and shear modulus of the pure mineral, the bulk and shear modulus of the dry rock (K b, G b) can be computed from the implicit equations given below: ##EQU3## G h and K h are obtained from equations (1) and (2). The solution is iterative, and converges rapidly, since equations (6), (7) and ...
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Inversion for Geofluid Discrimination Based on ...
The bulk modulus of a fluidsaturated rock containing the fluid effects can be expressed as following from Gassmann's equation, where,,, and are the bulk modulus of the dry rock, the saturatedrock frame, mineral grain, and geofluid, respectively, is the porosity of the rock, is the increment resulting from the fluid saturation, and and are ...
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