X-Ray Fluorescence Determination of Ni, Cu, and Zn in Rock Powders with Variable Matrices: ABSTRACT

J. R. Smith, R. G. Arnold

AAPG Bulletin

... (standard deviation of a single determination) of about ±4% for Zn, ±5% for Ni, and ±8% for Cu at a concentration level of 70 ppm. Determinations...

Estimation of Formation Pressures from Log-Derived Shale Properties: ABSTRACT

C. E. Hottman, R. K. Johnson

AAPG Bulletin

.... The standard deviation for the resistivity method is 0.022 psi per ft. and for the acoustic method 0.020 psi per ft. Knowledge of the first occurrence...

Estimation of Heat Flow in Oil Wells Based on Relation Between Heat Conductivity and Sound Velocity: ABSTRACT

J. J. H. C. Houbolt, P. R. A. Wells

AAPG Bulletin

... of the UK sector of the North Sea. In this region the mean relative heat flow using data from 120 wells is 0.601 BU, with a standard deviation of 0.055 BU...

Application of Nonlinear Constraints to Processing of Seismic Data: ABSTRACT

F. Baixas, P. Hooyman, C. Wu, R. Inguva, L. Schock

AAPG Bulletin

... of a deconvolved gather, the mean and the standard deviation are associated within the chi-square constraint to generate a new stack estimator...

Dispersal patterns in Upper Devonian quartzose sandstones in West Central Colorado

John A. Campbell

CSPG Special Publications

..., with southeasterly-moving currents the most prominent. Linear trend surfaces demonstrate that the sorting, as measured by standard deviation of grain size...

Dispersal patterns in Upper Devonian quartzose sandstones in West Central Colorado

John A. Campbell

CSPG Special Publications

..., with southeasterly-moving currents the most prominent. Linear trend surfaces demonstrate that the sorting, as measured by standard deviation of grain size...

Hydrodynamic Implications of Beach, Beach Ridge and Dune Grain Size Studies

Frank W. Stapor , William F. Tanner

Journal of Sedimentary Research (SEPM)

... entering the discriminant functions and the cannonical plots; standard deviation is the next most important. These two measures for beach ridge sands show...

Shale Variability in Deep-Marine Depositional Systems: Implications for Seal Character - Subsurface and Outcrop Examples

William C. Dawson, William R. Almon, Kelly Dempster, and Sally J. Sutton

Search and Discovery.com

... 20 Gaussian Distribution Number of data points used = 68 Average X = 3,206 Standard Deviation = 2,248 Very silty shales (mean: 3,206 psia) 16...

Seismic Array Response in the Presence of Intra-Array Variations in Element Weights, Elevations, and Positions; #42328 (2018)

Ryan Adhi Putra, Abdullatif A. Al-Shuhail

Search and Discovery.com

... with zero mean and σ standard deviation were generated and were applied to the elements' weights, elevations, and positions, where N is the number...

Setting environmental standards: A statistician's perspective

Peter Guttorp

Environmental Geosciences (DEG)

..., as suggested above, the square root of the daily maximum of hourly ozone has a Gaussian distribution with mean and standard deviation , we have the following...

Note on the Texture of Some Pleistocene Sands: NOTES

Robert N. Schock

Journal of Sedimentary Research (SEPM)

... and beach sands from the residual berm. The sands were sieved using phi interval screens. The mean, standard deviation, skewness, and kurtosis were...

A New Method for Obtaining Significant Average Directional Measurements in Cross-Stratification Studies

O. B. Raup, A. T. Miesch

Journal of Sedimentary Research (SEPM)

.... The estimated standard deviation of the first 50 measurements is determined, and, by simple linear regression equation, the number of measurements...

Evaluating the Consistency of Plate Models With Geologic Observations

Search and Discovery.com

Model Based Deviated VSP Reservoir Imaging Technique in tough field conditions

Search and Discovery.com

Predicting the Permeability of Unconsolidated Sediments From Grain Size Measurements

Eve S. Sprunt, Ron E. Gilliland, Mary L. Barrett

GCAGS Transactions

..., and the median, mean, and standard deviation of the particle size distributions. The equations are tested for slightly laminated samples, which are treated...

Color Variations within Glacial Till, East-central North Dakota--A Preliminary Investigation

T. E. Kelly, Claud H. Baker, Jr.

Journal of Sedimentary Research (SEPM)

... having a normal distrib tion of grain sizes. The parameters most commonly used are: mean, standard deviation (sorting), skewness, and kurtosis...

Arithmetic Means of Circular Data

William H. Wood, Rhoda M. Wood

Journal of Sedimentary Research (SEPM)

.... V., 1953, Mean and standard deviation of certain geologic data--a discussion: Am. Jour. Sci., v. 251, p. 899-906. KRUMBEIN, W. C., 1939, Preferred...

Reliability of Visual Estimates of Grain Abundance

John M. Dennison, James H. Shea

Journal of Sedimentary Research (SEPM)

... percent of the mixture to 5 percent standard deviation for materials comprising 10 and 95 percent of the m xture. There were no effects in accuracy...

Abstract: Issues in Uncertainty Estimation for Time-to-Depth Conversion, by Michael K. Broadhead, Thomas M. Loretto, and Timothy H. Keho; #90077 (2008)

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Sampling Surficial Fluvial Gravels: The Precision of Size Distribution Percentile Estimates

Stephen Rice , Michael Church

Journal of Sedimentary Research (SEPM)

... error expressed in absolute terms (e.g., phi or ram), s is the population standard deviation, n is sample size, p is the percentile proportion, and yp...

Empirical Conversion Equations for Thin-Section and Sieve Derived Size Distribution Parameters

J. A. Harrell, K. A. Eriksson

Journal of Sedimentary Research (SEPM)

... linear regression analysis, for several graphical size distribution statistics: median, graphic mean, inclusive graphic standard deviation, graphic...

Brazos River Bar: A Study in the Significance of Grain Size Parameters

Robert L. Folk, William C. Ward

Journal of Sedimentary Research (SEPM)

.... The relative proportions of each mode define a systematic series of changes in numerical properties; mean size, standard deviation and skewness...

Discussion of Article "Transformation of Weight Frequency and Number Frequency Data in Size Distribution Studies of Clastic Sediments" by Basanta K. Sahu: DISCUSSION

Mark A. Dixon

Journal of Sedimentary Research (SEPM)

... would be a different matter. Assuming the sieved distribution to be normal with a standard deviation about one-fourth of the aperture range, or .0625...

Abstract: Analisis pengkuantitatifan gred luluhawa bahan batuan granit dengan ujian tukul Schmidt: Contoh kajian di Malaysia (Paper P9) (IN MALAY), Quantitative analysis of weathered granite material with Schmidt hammer test: Sample survey in Malaysia

Nurul Baizura Mohd Yunus, Abdul Ghani Rafek, T. L. Goh, Mohd Hariri Arifin

Geological Society of Malaysia (GSM)

.... Calculated at 95% confidenc level, the mean Schmidt Hammer rebound values for fresh granites (Grade I) was 54 (±0.16) with the standard deviation...

A Comparison of Depth-Conversion Methods in the Gulf of Mexico

Melvan D. Carter, Gary R. Hyatt

GCAGS Transactions

... has a variable mean error (from 0 to 93 feet) but a relatively stable standard deviation (from 22 to 43 feet). The deepest reflection has a highly...