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The AAPG/Datapages Combined Publications Database
Showing 23,320 Results. Searched 195,387 documents.
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...
1967
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...
1984
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...
1958
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...
1960
Estimation of Arithmetic Permeability From a Semi-Log Poro/log10Perm Regression
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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...
1952
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...
1964
ABSTRACT: Average Fracture Spacing in Subsurface Rock, by Wayne Narr; #91019 (1996)
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1996
Abstract: Average Fracture Spacing in Subsurface Rock, by W. Narr; #90951 (1996).
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1996
Carbonate Reservoir Characterization Using Electrical Borehole Image Revisited Existing Methods Using Textural Analysis Workflow; #41505 (2014)
Alexander A. Aviantara
Search and Discovery.com
...) 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...
2014
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...
1968
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...
1955
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...
1965
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...
2004
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...
1979
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...
1969
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...
1979
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...
1984
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...
1984
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...
1971
Abstract: Estimation of Q: a Comparison of Different Computational Methods; #90187 (2014)
Peng Cheng and Gary F. Margrave
Search and Discovery.com
... 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...
2014
Abstract: Louisiana Cheniers: Settling from High Water, by W. F. Tanner; #90989 (1993).
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1993
Abstract: Paleo-Currents in Eocene to Jurassic Strata of North Central Louisiana, by Douglas A. Carlson; #90078 (2008)
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2008