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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,689 documents.
A History of the Principles and Methods of Mechanical Analysis
W. C. Krumbein
Journal of Sedimentary Research (SEPM)
... frequency functions. He applied these statistical methods to sands and computed the mean, the mode, the standard deviation, and skewness. In 1926 Wentworth...
1932
Chapter 11: Kimmeridge Clay Formation, United Kingdom—A Mesozoic Clastic-Carbonate Shelf-to-Intrashelf Basin System: An Outcrop-to-Subsurface Analog for the Haynesville, Vaca Muerta, and Bazhenov Formations
K. M. Bohacs, J. Macquaker, O. R. Lazar
AAPG Special Volumes
... appears to have a somewhat different frequency distribution of TOC content, for although the skewness is generally similar among the facies...
2022
Central Texas Coast Sedimentation: Characteristics of Sedimentary Environment, Recent History, and Diagenesis: PART 1
Francis P. Shepard, David G. Moore
AAPG Bulletin
... measures of particle size distribution: median diameter, sorting, and skewness. End_Page 1498------------------------------ methods, contours...
1955
Late Cretaceous Stratigraphy of Black Mesa, Navajo and Hopi Indian Reservations, Arizona
Charles A. Repenning, Harry G. Page
AAPG Bulletin
... analyzed in the laboratory to determine percentage of soluble material, median diameter of grains, and coefficients of sorting and skewness. La oratory...
1956
Bahaman Calcareous Sands
Leslie V. Illing
AAPG Bulletin
... 4: the former includes the usual statistical quartile parameters, namely, the median diameter, first and third quartiles, sorting index, and skewness...
1954
Tidally Modulated Shorefaces
Shahin E. Dashtgard, Murray K. Gingras, James A. MacEachern
Journal of Sedimentary Research (SEPM)
... dominated by very fine-grained sand, silt, and clay were determined using X-ray adsorption. Mean grain size (φ), sorting (σ), and skewness were calculated...
2009
Geochemical and Sediment Diversity of Mobile Bay, Alabama
Wayne C. Isphording, Jane Ashley Cordi, Ricky A. Schaeffer
GCAGS Transactions
... the bay’s distribution of sand-, silt-, and clay-sized material (by percentage), mean grain size, sorting, and skewness. Information and contour maps...
2009
Architecture and Permeability Structure of Fluvial-Deltaic Sandstones, Ferron Sandstone, East-Central Utah
Michael H. Gardner, Mark D. Barton, Noel Tyler, R. Stephen Fisher
Rocky Mountain Section (SEPM)
... as estimated by the coefficient of skewness, (2) the central tendency estimated by the arithmetic mean, and (3) the variance estimated by the coefficient...
1992
Taphonomic variability of fossil insects: A biostratinomic study of Palaeontinidae and Tettigarctidae (Insecta: Hemiptera) from the Jurassic Daohugou Lagerstätte
Bo Wang, Haichun Zhang, Edmund Aleksander Jarzembowski, Yan Fang
PALAIOS
... of medians and is, therefore, sensitive to central tendency, and the K-S test is for equality of distributions and is more sensitive to skewness and kurtosis...
2013
The Middle Jurassic Rock Creek Member and Associated Units in the Subsurface of West-Central Alberta
D. J. Marion
CSPG Special Publications
... grain size), σ-GI (inclusive graphic standard deviation), Ski (inclusive graphic skewness) and KG (graphic kurtosis). The mean grain size (Mz...
1984
Paleoenvironmental Variation Curves And Paleoeustatics
Lee A. Smith
GCAGS Transactions
... of material in the sample which could represent shoreward or seaward environments (degree of skewness of the population-distribution curve). Figure 1...
1965
A Surface to Subsurface Study of the Sycamore Limestone (Mississippian) Along the North Flank of the Arbuckle Anticline1
Tony Cole
Oklahoma City Geological Society
..., skewness, and kurtosis. These data were used to determine the depositional environment of the Sycamore. Using the classification system of Rich (1951...
1989
Geostatistical Modeling of the Spaces of Local, Spatial, and Response Uncertainty for Continuous Petrophysical Properties
P. Goovaerts
AAPG Special Volumes
... (positive skewness), a prior transform of observations is typically required, and the multi-Gaussian approach proceeds as follows.The original z-data...
2006
A STUDY OF THE CENTRAL PART OF THE INDEPENDENCE MINING DISTRICT, PARK AND SWEET GRASS COUNTIES, MONTANA
Phillip R. Moyle, Alan R. Buehler
Montana Geological Society
... of positive skewness. Figure 3...
1989
Volcaniclastic Strata of the Upper Jurassic Santiago Peak Volcanics, San Diego, California
Duane C. Balch, Sarah H. Bartling, Patrick L. Abbott
Pacific Section SEPM
... . 5 0 - - - 1 2 3 I.I 0 3 . 1 8 A LOS PENA Q ITOS C gyoN SU A00 | 7 14 2 51 16 6 22 42 0 0 32 13 0 0 Mean Size, Sorting, Skewness, etc...
1984
Geostatistical Integration of Crosswell Data for Carbonate Reservoir Modeling, Mcelroy Field, Texas
William M. Bashore, Robert T. Langan, Karla E. Tucker, Paul J. Griffith
Special Publications of SEPM
.... Skewness coeff. Coeff. variation Minimum value Maximum value Median value Lower quartile Upper quartile Interquartile 5 ------ 1962 50326 6731 -0.491...
1995
On the Formation of the Vitiaz Trench Lineament and North Fiji Basin
Thomas M. Brocher
Circum Pacific Council Publications
.... Comparison with synthetic magnetic anomalies shows that the observed anomalies have the correct skewness for sea-floor spreading along the inferred...
1985
A coal-sulfur model for Sydney Coalfield (Upper Carboniferous), Nova Scotia, Canada
Erwin L. Zodrow
Atlantic Geology
... tail (positive skewness as expected for geochemi cal variables). Hence, an unequal data spread about the means exist. Moreover, the frequency...
1991
The Geochemistry of Trace Elements in Marine Phosphorites: Part I. Characteristic Abundances and Enrichment
Z. S. Altschuler
Special Publications of SEPM
... are essentially the same None of the Sr and Zn elements have median values larger than mean Hg reflecting Sc a universal skewness toward the lower...
1980
Depositional Environments of the Lower Cretaceous Smiths Formation Within a Portion of the Idaho-Wyoming Thrust Belt
Steven Kenneth Durkee
Wyoming Geological Association
... Member and attempted to discern the depositional environment from statistical plots relating mean grain size versus standard deviation and skewness...
1980
Mesozoic and Cenozoic Chronostratigraphy and Cycles of Sea-Level Change
Bilal U. Haq, Jan Hardenbol, Peter R. Vail
Special Publications of SEPM
... with qualification. In our view, given the ex- tude of some anomalies and anomaly skewness can also isting set of radiometric data, one cannot, as yet...
1988
Hydrogeology, Geopressures and Hydrocarbon Occurrences, Beaufort-Mackenzie Basin
Brian Hitchon, J.R. Underschultz, Stefan Bachu, C.M. Sauveplane
CSPG Bulletin
..., HCO3/SO4, SO4/Cl and HCO3/Cl and salinity) indicate positive skewness for each variable and a degree of bimodality for salinity and Mg/Ca. As a result...
1990
Petrographic Comparison of Some Loess Samples from Western Europe with Kansas Loess
Ada Swineford, John C. Frye
Journal of Sedimentary Research (SEPM)
.... In the European samples the sorting is less perfect and the skewness is also greater. Sample 1 from near Torino, Italy, is virtually identical with some...
1955
Petrophysical Properties of Matrix Blocks of a Heterogeneous Dolostone Reservoir - the Upper Devonian Grosmont Formation, Alberta, Canada
Ping Luo,, Hans G. Machel, Jerry Shaw
CSPG Bulletin
.../median" ratio, can be used to determine skewness (Table 1). If the mode/median ratio is 1, the curve is symmetric. If this ratio is > 1, the curve...
1994
Petrology of the Eocene Sabinetown-carrizo Contact, Bastrop County, Texas
J. Richard Harris
Journal of Sedimentary Research (SEPM)
... and Moore, 1954) because of the low gradient of the distributaries and slow currents of the bordering neritic zone. The skewness and kurtosis values...
1962