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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,689 documents.
Optimal Configuration and Information Content of Sets of Frequency Distributions: DISCUSSION
Donald Bowles, Patrick Mclaren
Journal of Sedimentary Research (SEPM)
... of feature extraction. Presently we use the phi mean, variance and skewness as the features of the sediment (McLaren and Bowles 1985). Another method...
1985
Dolomitization and Dolomite Neomorphism in the Back Reef Facies of the Bonneterre and Davis Formations (Cambrian), Southeastern Missouri
Jay M. Gregg, Kevin L. Shelton
Journal of Sedimentary Research (SEPM)
.... The transitions are accompanied by progressive increase in average crystal size and an increased skewness toward the coarse size fraction. Planar dolomite...
1990
Architecture and evolution of calciclastic marginal slope fans of the Ordovician carbonate platform in the Yijianfang outcrop of the Bachu area, west Tarim Basin
Hui Rong, Yangquan Jiao, Liqun Wu, Rui Wang, Yuan Gu, Xiaomei Wang
AAPG Bulletin
..., = standard deviation, Sk = skewness, and Kg = kurtosis. The standard deviation () quantifies the degree of sorting of the grains (Folk and Ward, 1957...
2013
ABSTRACT: Preservation of Sandbanks within Present-Day Estuaries (Atlantic Coast of France) Revealed by Very High Resolution; #90013 (2003)
Chaumillon Eric, Weber Nicolas, Tesson Michel, Tessier Bernadette
Search and Discovery.com
...; So = Sorting, Sk = Skewness. C = Clay; Si = Silt; Sa = very fine sand; FS = fine sand; S = sand; CS =Coarse sand; G = gravel; P = Pebble (1) Facies...
2003
Aggregation Methodology for the Circum-Arctic Petroleum Assessment, #40500 (2010)
John H Schuenemeyer
Search and Discovery.com
... Fields Trials 10,000 Mean 1,469,886.80 Median 1,354,311.27 Standard Deviation Variance 635,029.30 403,262,208,209.38 Skewness 1.12 Kurtosis...
2010
Fluvial Transport and Downstream Sediment Modifications in an Active Volcanic Region
David K. Davies, Richard K. Vessell, Robert C. Miles, Michael G. Foley, Samuel B. Bonis
Dallas Geological Society
... 12. Downstream variation in A, sorting; and B, skewness. As expected, sediments in these high slope streams are coarsely skewed with some tendency...
1977
Application of Petrophysics of Oolitic Limestone in Petroleum Exploration
Hugh J. Mitchell-Tapping
Circum Pacific Council Publications
... as increasing pressure forces the mercury through successively smaller pore throats. The shape of the curve is determined by the sorting and skewness...
1989
Fluvial Transport and Downstream Sediment Modifications in an Active Volcanic Region
David K. Davies, Richard K. Vessell, Robert C. Miles, Michael G. Foley, Samuel B. Bonis
CSPG Special Publications
... 12. Downstream variation in A, sorting; and B, skewness. As expected, sediments in these high slope streams are coarsely skewed with some tendency...
1977
Integrated Analysis for Carbon Capture and Storage in Basaltic Rocks of the Paraná Basin: An Approach Based on Petrophysical, Geological, and Emission Sources Data
João Paulo Alves, Claudio Riccomini
Unconventional Resources Technology Conference (URTEC)
... transformed using logarithm to reduce data skewness and facilitate modeling. Nonlinear regression was employed using a cubic function, indicating a weak...
2023
The Relict Nature of the Sediments and Submarine Topography Off Alligator Harbor, Florida
E. M. Hopkins, H. G. Goodell, S. A. Chesser, J. P. May, D. J. Poche
GCAGS Transactions
..., and 0.83 percent silt and clay. The mean of this average distribution is 1.62 phi; its phi standard deviation is 0.98; its skewness is 0.54; its...
1969
Physical Analysis of Oil Sands
P. G. Nutting
AAPG Bulletin
... millimeters. The "spread" of the curve (Table II) is simply the width at half the maximum height. The "skewness" is a measure of its dissymmetry, the ratio...
1930
The Petrography of Israeli Phosphorites as Related to their Beneficiation
S. Axelrod, A. Metzer, V. Rohrlich
Special Publications of SEPM
... Oron2 2 75 2 8 3 1 Oron3 29 3 0 3 1 3 05 105 0 14 Sample mean sorting sorting 43 3 35 1 2 78 skewness 33 1 0 21 02 0 Arad IO...
1980
Effects of Seagrass Beds on Tidal Flat Sedimentation, Corner Inlet, Southeast Australia
Wu-Yi Zhuang, John Chappell
CSPG Special Publications
... is charaterized by a strong fine-skewness and finer grain size (higher mud fraction), and sand flat sediments display a coarse-skewness, as is evidenced...
1991
Petrophysical Properties of the Sligo Formation of Northern Louisiana and Arkansas
Hugh J. Mitchell-Tapping
GCAGS Transactions
... is determined by the sorting and skewness (a statistical moment) of the pore-throat size. The measure of the range from the finest to the largest pores...
1981
Recognition of a Relationship between Depth and Macroboring Distribution in Growth Framework Reef Cavities, Bonaire, Netherlands Antilles
David R. Kobluk, Miran Kozelj
CSPG Bulletin
... specimens for Bonaire. The standard deviation and skewness are of the cross-sectional area (cm2) of boreholes. End_Page 465...
1985
Provenance of Quaternary Beach Deposits, Virginia and North Carolina
Dennis A. Darby, Allen E. Evans Jr.
Special Publications of SEPM
... beneath the surface elevation 6 m The sands range between 0 5 and 3 1 1 5 in mean size Mz of Folk 974 with an average Mz of 2 0 and are 1 skewness Low...
1992
Sedimentary Environments of the Inner Continental Shelf, Northeastern Gulf of Mexico
Joseph F. Donoghue
GCAGS Transactions
... equally distributed between beach and river textural characteristics. Figure 5 is a similar bivariate plot of skewness versus kurtosis. River sands...
1989
Organic Sedimentation in Warnbro Sound, Western Australia
Maurice A. Carrigy
Journal of Sedimentary Research (SEPM)
... of all samples, and "phi" median diameters, first and third quartiles, "phi" quartile deviation, and "phi" skewness have been calculated. Carbon and total...
1956
Origin of Barrier Islands on Sandy Coasts
William F. Tanner
GCAGS Transactions
... it appears that the nuclei amd the subsequent ridges fit into a single historical sequence. The skewness values for the two nuclei are -0.195...
1990
Probability Curves and the Recognition of Adjustment to Depositional Environment
Stuart A. Harris
Journal of Sedimentary Research (SEPM)
... the interpretation of these curves. Some authors have used the refill "skewness" for a method of measuring the degree of departure of the probability curve...
1958
Petrologic Discrimination Between the Neogene Formations in Adams and Wilkinson Counties, Southwestern Mississippi
Kenneth F. Rhinehart, Maurice A. Meylan
GCAGS Transactions
.... The terrace deposits tend to be finer than either the Citronelle or Natchez Formations. Graphic measures of sorting, skewness, and kurtosis for sediments...
1992
Modification of Sediment Size Distributions
William F. Tanner
Journal of Sedimentary Research (SEPM)
... mean, the apparent truncation will appear in the coarser tail of the sample (fig. 7), and positive phi skewness appears. If the filter mean is finer...
1964
Holocene and Late Pleistocene Sedimentary Facies of a Sand-Rich Continental Shelf: A Standard Section for the Northeastern Gulf of Mexico
Randolph A. McBride l, Mark R. Byrnes , Laurie C. Anderson , Barun K. Sen Gupta
GCAGS Transactions
... sorted and has positive skewness (strongly fine-skewed). The benthic foraminifera assemblage is dominated by the hyaline species Hanzawaia concentrica...
1996
The Mineralogical Composition of Shales
Daniel B. Shaw , Charles E. Weaver
Journal of Sedimentary Research (SEPM)
.... 1, 2, 3 and 4). The first three plots are positively skewed with coefficients of skewness calculated to be: quartz, sk=+0.13; feldspar, sk=+0.67...
1965
Form and Function of Sedimentary Particles
N. C. Flemming
Journal of Sedimentary Research (SEPM)
... of the displacement of the axes, and thus the elliptical volume sphericity of a particle is independent of its skewness. Sphericity is therefore...
1965