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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,550 documents.
The Relation Between Porosity, Permeability, and Porous Geometry in Reservoir Rock
Kimball L. Hamberger
Oklahoma City Geological Society
... curve the median, the Phi quartile deviation or sorting, and the Phi skewness were determined. The median is that size which is greater than and less...
1961
Shoreline and Beach Changes on Honeymoon Island, Pinellas County, Florida, 1967-1971
Alexandra P. Wright , Edward O'Donnel
GCAGS Transactions
... graphic skewness and kurtosis were calculated by the IBM 360-65 computer using a sediment analysis program. The non-carbonate fraction: The percent of non...
1973
Texture and Composition of Some Weathered Granites and Slightly Transported Arkosic Sands
Michael C. Mcewen, Franklin W. Fessenden, John J. W. Rogers
Journal of Sedimentary Research (SEPM)
... distribution. Values of median size, sorting coefficient, and skewness for the measured size distributions of three grus samples (43b, 44b, and 45b) from...
1959
Depositional Mechanisms from the Size Analysis of Clastic Sediments
Basanta K. Sahu
Journal of Sedimentary Research (SEPM)
... in the literature. Trask's (1932) coefficients of sorting and skewness are based on the quartile measures in millimeters but they represent only fifty percent...
1964
The Sediments of Card Sound, Florida
Charles F. Earley, H. G. Goodell
Journal of Sedimentary Research (SEPM)
..., selected for their location and percentage of fines. The phi mean, standard deviation, skewness, and kurtosis were computed for each set of textural...
1968
Lithology Controls Ammonoid Size Distributions
Kenneth De Baets, Emilia Jarochowska, Stella Zora Buchwald, Christian Klug, Dieter Korn
PALAIOS
... in marls. Complete sampling led to skewness values close to zero (symmetrical distributions) and high kurtosis. Samples from higher paleolatitudes were...
2022
Submarine Geology of San Pedro Shelf
D. G. Moore
Journal of Sedimentary Research (SEPM)
.... Skewness: The phi skewness of each of the analyzed samples was plotted, and a rather complex pattern of skewness resulted. Certain general trends...
1954
Winnowing--An Important Process in the Concentration of the Stairway Sandstone (Ordovician) Phosphorites of Central Australia
Peter J. Cook
Journal of Sedimentary Research (SEPM)
... diameters is shown by most of the phosphorites. The skewness, standard deviation etc. values for these four curves are given in table 1...
1967
Factors Affecting the Carbon and Oxygen Isotopic Composition of Marine Carbonate Sediments, Part III, Eniwetok Atoll
Jon N. Weber ,, R. F. Schmalz
Journal of Sedimentary Research (SEPM)
... diameter, coefficients of sorting and skewness) were obtained from the resulting size frequency distributions. The median diameter (Md) or measure...
1968
Patterns of Grain-Size Distribution in Some Point Bars of the Usri River, India
Barendra Purkait
Journal of Sedimentary Research (SEPM)
..., the graphic skewness = 0, and the kurtosis = 1. Hyperbolic: Denoting the size variable by and the density function S ( the equation for the hyperbolic curve...
2002
Paleogeographic Inferences from Suite Statistics: Late Pennsylvanian and Early Permian Strata in Central Oklahoma
William F. Tanner
Oklahoma City Geological Society
...-county area, because this information is already well Figure 3. The settling diagram. Horizontal axis: standard deviation of sample skewness values...
1989
Near Shore Coral Lagoon Sediments from Raiatea, Society Islands
J. T. Stark, E. C. Dapples
Journal of Sedimentary Research (SEPM)
... of the phi-quartile skewness are -.42 and .190, and -.162 is the arithmetic mean. Samples taken at the strand line generally are better sorted than those taken...
1941
A Method for the Size Analysis of Sand on a Number Frequency Basis
Arthur W. Marschner
Journal of Sedimentary Research (SEPM)
... the particles, and the standard deviation is the sorting factor or "spread" about the mean. A fairly good skewness reading can be had from Pearson's skewness, SK...
1953
Grain-Size Analysis of Jacksonian Sediments of Mississippi and Adjacent Areas
Ming-Shan Sun
Journal of Sedimentary Research (SEPM)
.... In such case, the shell fragments and some TABLE 1. Summary of quartile measures, median, coefficient of sorting, and skewness of Jacksonian sediments...
1956
Size Distribution of Zircon and Tourmaline Grains in Some Samples of the Lissie Formation
John J. W. Rogers, Ross E. Dawson, Jr.
Journal of Sedimentary Research (SEPM)
.... The restriction of the grains to relatively few size classes prevents accurate measurement of skewness and, especially, of kurtosis. The available...
1958
Transformation of Weight Frequency and Number Frequency Data in Size Distribution Studies of Clastic Sediments
Basanta K. Sahu
Journal of Sedimentary Research (SEPM)
... two measures (Skewness, Correlation coefficient 0.51; and Kurtosis, Correlation coefficient 0.45). It has been shown by the author (Sahu, in press...
1964
Definition and Properties of a Variability Index of Deltaic Sediments: NOTES
Hugo Mandelbaum
Journal of Sedimentary Research (SEPM)
... layer in the core, the thickness of which was noted. For each sample the mean, standard deviation, skewness, FIG. 1. St. Clair River Delta. End_Page...
1970
Variability of Zircons from the Sharon Conglomerate of Northeastern Ohio
R. A. Heimlich, L. B. Shotwell, T. Cookro, M. J. Gawell
Journal of Sedimentary Research (SEPM)
... zircon suites (Brindley and Gupta, 1973; Poldervaart, 1956) and right skewness is not uncommon for such zircons (Spotts, 1962; Taubeneck, 1957...
1975
Characterization of Alluvial Sources in the Owens Valley of Eastern California Using Fourier Shape Analysis
J. L. Wagoner, J. L. Younker
Journal of Sedimentary Research (SEPM)
.... The histogram for the grains with a volcanic source appears polymodal, but with an overall positive skewness. SUMMARY AND CONCLUSIONS In this study...
1982
The Goodness-of-Fit to Ideal Gauss and Rosin Distributions: A New Grain-size Parameter: DISCUSSION
Daniel Hartmann
Journal of Sedimentary Research (SEPM)
... erosion and accumulation. 1: Sediment changes: Geogr. Ann., v. 70A (in press). DUANE, D. B., 1964, Significance of skewness in recent sediments, Western...
1988
A Critique of the "McLaren Method" for Defining Sediment Transport Paths: DISCUSSION
Shu Gao, Michael Collins
Journal of Sedimentary Research (SEPM)
... to spatial changes in the mean grain size, µ, the sorting coefficient, 2, and the skewness, Sk, of the distribution. As shown on Figure 1, for sampling...
1991
Facies Characteristics and Static Reservoir Connectivity of Some Siliciclastic Tertiary Outcrop Successions in Bintulu and Miri, Sarawak, East Malaysia, #51035 (2014).
Numair A. Siddiqui, Abdul Hadi bin Abd Rahman, Chow W. Sum, Manoj J. Mathew, David Menier
Search and Discovery.com
... (for sorting, textural group, skewness, mode and mean values) curve to represent the grain size distribution in different facies of Nyalau and Miri...
2014
Some Palaeogeographical features of the Brazilian Devonian
Riad Salamuni, Joao Jose Bigarella
CSPG Special Publications
..., being in general 0.8–0.9. The skewness is usually positive (Bigarella, Salamuni and Marques Filho, 1966, p. 39–52). In the Parnaiba Basin, for the 25...
1967
Some Palaeogeographical features of the Brazilian Devonian
Riad Salamuni, Joao Jose Bigarella
CSPG Special Publications
..., being in general 0.8–0.9. The skewness is usually positive (Bigarella, Salamuni and Marques Filho, 1966, p. 39–52). In the Parnaiba Basin, for the 25...
1967
Advanced Machine Learning Methods for Prediction of Fracture Closure Pressure, ClosureTime, Permeability and Time to Late Flow Regimes From DFIT
Mohamed Ibrahim Mohamed, Dinesh Mehta, Mohamed Salah, Mazher Ibrahim, Erdal Ozkan
Unconventional Resources Technology Conference (URTEC)
... curve" as shown in Figure 7. Adjusting for right skewness was done by taking the logs of the variable and thus adjusted the more extreme high values...
2020