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S 0 is the sorting coefficient of Trask.
The primary sandstone porosity is influenced by a combination of sorting coefficient and average particle size.
The Inman parameters (Inman 1952) [the sorting coefficient and median diameter (M d)] were used to determine the grain-size characteristics.
Open image in new window Fig. 3 Relationship between primary porosity and particle size as well as sorting coefficient varPhi_{0} = - 3.652 {text{ln}}left( M right) + 35.744 quad R^{ 2} = 0. 7755, (11) varPhi_{0} = - 12.61 {text{ln}}left( {So} right) + 48.508quad R^{ 2} = 0. 8621, (12 where M is average particle size, So is sorting coefficient, and Φ 0 is primary porosity.
II III Average particle size M, mm 0.262 0.293 Sorting coefficient So 1.575 1.86 Primary porosity Φ 0, % 42.92 37.37 Porosity loss during rapid compaction stage, %/2.3 MPa 0.334 0.866 Porosity loss during slow compaction stage, %/2.3 MPa 0.156 0.127.
Core sandstone from 876, 1140 1145, and 1803.08 m gave Krumbein phi values of 3 4 and 2 3 Φ, sorting coefficient ranging from 3 to 4, a skewness of 0.3, and a kurtosis ranging from 0.9 to 1.11.
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TGSDs in TephraProb are assumed Gaussian (in ϕ units) and are defined by ranges of median diameters and sorting coefficients.
At each probabilistic run, values of median diameters and sorting coefficients are sampled and used to create a Gaussian distribution.
Core sandstones from 382 386, 866.6, and 1138.8 m gave mean Krumbein phi values of 4 8 and 3 4 Φ, sorting coefficients between 1 and 2, skewness greater than 0.3, and a kurtosis exceeding 1.56.
Trask's sorting coefficients for four sets of the Shaximiao reservoirs are 1.125, 1.13, 1.13, and 1.218, respectively.
For each free flux, we sorted the coefficient sensitivities by sign and decreasing magnitude.
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