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The AAPG/Datapages Combined Publications Database

Showing 22,396 Results. Searched 191,769 documents.

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Dynamic Processes and Statistical Parameters Compared for Size Frequency Distribution of Beach and River Sands

Gerald M. Friedman

Journal of Sedimentary Research (SEPM)

... Deviation, Standard Deviation, Graphic Skewness, Graphic Standard Deviation, and the Simple Skewness Measure and Simple Sorting Measure. The latter two...


A Visual Comparator for Degree of Sorting in Thin and Plane Sections: RESEARCH METHOD PAPER

James Harrell

Journal of Sedimentary Research (SEPM)

...--an introduction: New York, John Wiley & Sons, 252 p. End_of_Record - Last_Page 650------- Geologists are often interested in the standard deviation...


Differentiation of Beach, Dune, and Aeolian Flat Environments by Size Analysis, Mustang Island, Texas

Curtis C. Mason, Robert L. Folk

Journal of Sedimentary Research (SEPM)

... STANDARD DEVIATION (I) VALUES C. DISTRIBUTION OF SKEWNESS (SkI) VALUES End_Page 214------------------------ because of the tendency of the sand to jam up...


An Analysis of the Observed Time Discrepancies Between Continuous and Conventional Well Velocity Surveys

P. E. F. Gretener

CSPG Bulletin

... indicated by the bell-shaped outline of the histogram1. The standard deviation from the average is 1.8 ms/1000 ft. There is a systematic deviation...


Measures for Describing the Size Distribution of Sediments

Douglas L. Inman

Journal of Sedimentary Research (SEPM)

... size-frequency curve of a sediment. They include the mean (or median) diameter, standard deviation, kurtosis, and two measures of skewness, the second...


The Effect of Differences in Interpretation on the Lithological Evaluation of Electric Logs

Brian Hitchon

CSPG Bulletin

... coefficients of variance show centre of gravity and standard-deviation attributes to be subject to less variance than simpler attributes such as sand...


Carbonate Reservoir Characterization Using Electrical Borehole Image … Revisited Existing Methods Using Textural Analysis Workflow; #41505 (2014)

Alexander A. Aviantara

Search and

...) In the Newberry method (Newberry et al., 1996), the standard deviation of the porosity distribution is computed and a threshold is obtained by adding a multiple...


Kurtosis and Peakedness: NOTES

R. A. Baker

Journal of Sedimentary Research (SEPM)

...-statistical term it refers to "peakedness relative to the normal distribution with the same mean and standard deviation", and probably should...


Paleogeographic Reconstructions from Cross-Bedding Studies

William F. Tanner

AAPG Bulletin

... and Standard Deviation of Certain Geologic Data--a Discussion," Amer. Jour. Science, Vol. 251 (December), pp. 899-906. MELTON, F. A., 1947, "Onlap...


The Determination of Strontium in Oil Field Brines by Atomic Absorption Spectrometry: GEOLOGICAL NOTE

G. K. Billings, E. E. Angino

CSPG Bulletin

...). The average deviation of the standard-addition values from the standard curve values was ± 3% of the amount determined by the standard curve method. Since...


Sealing Capacity and Petrographic Characteristics of Eocene Marine Mudrocks, South-Central Pyrenean Foreland Basin, Spain

Frank G. Ethridge, Sally J. Sutton, William C. Dawson, William R. Almon, Jarrad G. Berg

Special Publications of SEPM

..., pore aperture diameter, standard deviation of pore diameter, and TOC. As expected sample porosity, pore diameter and standard deviation of pore...


Programmable Pocket Calculator as an Inexpensive Point Count System: METHOD PAPER

Charles L. Vavra

Journal of Sedimentary Research (SEPM)

... for percentage, count correction, data summation, and mean and standard deviation calculations. This program may be enlarged to include more complex analyses...


Environmental Analysis of Ancient Sandstone Bodies by Discriminant Analysis: ABSTRACT

R. J. Moiola, Daniel Weiser

AAPG Bulletin

... sedimentologists have demonstrated that certain combinations of textural parameters (e.g., mean diameter vs. skewness; mean diameter vs. standard...


Radon Emanation Over Orebody: Has Long-Distance Transport of Radon Been Observed?: ABSTRACT

Robert L. Fleischer, Antonio Mogrocampero

AAPG Bulletin

... at each position, the typical standard deviation being 14%. Superimposed on that stable pattern have been two periods during which spatially grouped...


Coral Content of Quaternary Reef Limestones: ABSTRACT

Robert N. Ginsburg, Dong Ryong Choi

AAPG Bulletin

... to be expected. The average standard deviation of coral percentages in simulated core borings is ± 13% as compared with percentages of their respective...


Computerized Particle Size Analyzer--An Exploration Technique, Saint Mary Field, Lafayette County, Arkansas: ABSTRACT

Thomas L. Ham, Raymond P. Bruce

AAPG Bulletin

... 1984 1212 1212 68 9. (September) Grain size frequency and cumulative weight percentages, mean grain size, standard deviation, and skewness provide...


Down-Current Bed Thickness and Grain-Size Variations Along Graywacke Beds, Gault Formation, Eastern Alps: ABSTRACT

Reinhard Hesse

AAPG Bulletin

.... If calculated as average deviations from a standard section, most individual sections show a systematic down-current decrease in graywacke bed...


Abstract: Estimation of Q: a Comparison of Different Computational Methods; #90187 (2014)

Peng Cheng and Gary F. Margrave

Search and

... and the smallest standard deviation of 7.07. The results of other three methods are comparable to one another. Then, synthetic reflection data is used...


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