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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,549 documents.
Heavy Minerals and Size Analysis of the Citronelle Formation of the Gulf Coastal Plain
Norman C. Rosen
Journal of Sedimentary Research (SEPM)
...). The parameters used are generally based on mean grain size, standard deviation (sorting), and the asymmetry of the curve about the mean (skewness) because...
1969
Bottom Sediments of Lake Manzalah, Egypt: NOTES
Saad K. El-Wakeel, Saad D. Wahby
Journal of Sedimentary Research (SEPM)
... are deduced. The coefficient of sorting SO, the coefficient of skewness Sk and its logarithm log Sk are calculated. Carbonate Determination.--Carbonate...
1970
An Estimate of Sediment Sieving Time from Computer Simulation
David Poche
Journal of Sedimentary Research (SEPM)
... of sieving time and that the effect of incomplete sieving could result in changes in the modality, skewness and sorting of the size distribution. He...
1972
Lake Chad: Geochemistry and Sedimentary Aspects of a Shallow Polymictic Lake
John S. Mothersill
Journal of Sedimentary Research (SEPM)
...-size distribution was determined by sieving and the sedigraph method supplemented by pipetting. The skewness, standard deviation, kurtosis and mean...
1975
Recent Sediments of the St. Lawrence Middle Estuary
B. d'Anglejan, M. Brisebois
Journal of Sedimentary Research (SEPM)
... scales), with a slightly negative skewness (Inman, 1952). Iron oxide stains the mineral grains, and they typically contain abundant rock fragments...
1978
Statistics Overview: Part 6. Geological Methods
T. C. Coburn, Brian R. Shaw
AAPG Special Volumes
... in point, use of the arithmetic mean to represent average permeability is generally inappropriate because of the lognormality and high skewness...
1992
Residual Sediment Transport Paths on a Tidal Sand Bank: A Comparison Between the Modified McLaren Model and Bedform Analysis
Veerle Vanwesenbeeck , Jean Lanckneus
Journal of Sedimentary Research (SEPM)
... distribution of mean grain size, standard deviation, and skewness were defined and used to determine the residual transport directions. The grain-size...
2000
Plotting Equation for Gaussian Percentiles and a Spreadsheet Program for Generating Probability Plots: REPLY
James H. Balsillie, Joseph F. Donoghue, Kenji M. Butler, Jennifer L. Koch
Journal of Sedimentary Research (SEPM)
..., skewness, kurtosis, and higher-order moment measures) which use the midpoint size value of any two adjacent sieves, termed the midpoint deviation...
2003
Surficial Deposits Overlying Simsboro Formation of Northeast Central Texas: GEOLOGICAL NOTES
Donald W. Kohls , Clyde R. Seewald
AAPG Bulletin
...), the inclusive standard deviation (^sgrI), the inclusive skewness (SKI), and the kurtosis (KG) were determined by the graphic method proposed by Folk...
1966
Forecasting Petroleum Production with a Model Based from Discharge Process; #40521 (2010)
Claudio Bettini and Reneu Rodrigues Da Silva
Search and Discovery.com
... skewness, either negative (longer tail at initial past years) or positive (longer tail at final future years). The functional shape is a consequence...
2010
Fracture Characterization and its Significance in Production from Unconventional Fractured Deccan Trap Reservoir, Padra Field, Cambay Basin, India, #20136 (2012)
Sushil Kumar, D. Mohan, A. Ahmed, B.S. Dhannawat
Search and Discovery.com
... distribution diagram for initial production shows skewness towards low production rate wells. (b) Frequency distribution diagram for cumulative...
2012
Tracking Procedures for Reserves and Resources Other than Reserves ROTR for Internal Reporting Processes
Nefeli Moridis, W. John Lee, Wayne Sim, Thomas Blasingame
Unconventional Resources Technology Conference (URTEC)
... distribution in a typical example case. URTEC-198296-MS 5 Figure 2—Plot of the error of the SM estimate of the mean, variance, and skewness...
2019
Waves, Currents, Sediments, and Sand Bars Associated with Low Energy Coastal Environments
Alan W. Niedoroda
GCAGS Transactions
... units. Standard procedures for calculating the graphic mean, inclusive graphic standard deviation, inclusive graphic skewness, and kurtosis were used...
1972
Sedimentary History of the Gilwood Sandstone (Devonian) Utikuma Lake Area, Alberta, Canada
Monzer S. Shawa
CSPG Bulletin
... and three statistical parameters: average mean size, standard deviation, and skewness, were computed for each thin-section using the Inman Formula (Inman...
1969
The Sediments of Barataria Bay
W. C. Krumbein , Esther Aberdeen
Journal of Sedimentary Research (SEPM)
..., (), and the phi-skewness, (Sk), End_Page 11------------------------- based on the moments of the distribution. In addition, the median...
1937
Bottom Deposits of the Ross Sea
H. C. Stetson, J. E. Upson
Journal of Sedimentary Research (SEPM)
... here (1). An attempt was made to use the statistical constants devised by Trask (2) for sorting and skewness, which are based on the relationships...
1937
The Sediments of Devils Lake, a Eutrophic-Oligotrophic Lake of Southern Wisconsin
W. H. Twenhofel, V. E. Mckelvey
Journal of Sedimentary Research (SEPM)
..., coefficients of sorting, coefficients of skewness, and log skewness are given in tables 1 and 2. Of the samples taken on the immediate bottom the median...
1939
Initial Shape and Roundness of Sedimentary Rock Mineral Particles of Sand Size
Harold L. Alling
Journal of Sedimentary Research (SEPM)
... (expressed as "B"). Not desiring to add unnecessarily to the overburdened catalog of special terms, the skewness of frequency-distribution curves...
1950
The "Gulf of Mexico" Late Holocene Sea Level Curve and River Delta History
William F. Tanner
GCAGS Transactions
.... There is a popular idea that the skewness, kurtosis, and higher moments are of no value and must be avoided. Many old or traditional references could be quoted...
1991
Analytical and Numerical Studies of Sand Erosion in Electrical Submersible Pump (ESP) Systems
Saúl Gómez Díaz de Bonilla, Her-Yuan Chen
Unconventional Resources Technology Conference (URTEC)
... on the skewness, how close to ideal (i.e., equilateral or equiangular) a face or cell is, and the orthogonality of the cells (means intersecting...
2019
Trends of Sedimentary Differentiation in Barakar Sandstones of the South Karanpura Coalfield, India
Indranil Banerjee
Journal of Sedimentary Research (SEPM)
..., quartile skewness, etc. Whereas the quartile values are based on the central 50 percent of the grain size, these newer measures take into account...
1963
Recognition of Fluvial Environments by Particle-Size Characteristics
C. F. Royse, Jr.
Journal of Sedimentary Research (SEPM)
... Moines Series sandstones of Iowa: Jour. Sedimentary Petrology, v. 20, p. 21 DUANE, D. B., 1964, Significance of skewness in recent sediments, western...
1968
Sedimentation in an Arctic Lake
J. P. Coakley, B. R. Rust
Journal of Sedimentary Research (SEPM)
.... Six cores were investigated for vertical textural variation. The graphic mean, the graphic standard deviation, and the graphic skewness were calculated...
1968
Coastal Processes and Depositional Patterns on Cape Ann, Massachusetts
Robert W. Cunningham , William T. Fox
Journal of Sedimentary Research (SEPM)
... by measuring the intermediate axes as is done, in effect, by sieves. Mean, standard deviation, skewness, and kurtosis were calculated by the graphic...
1974
Textural and Mineralogical Sorting Relationships in Krosno Formation (Oligocene) Turbidites, Polish Carpathian Mountains
Gerald L. Shideler , Andrzej Slaczka, Rafal Unrug, Marek Wendorff
Journal of Sedimentary Research (SEPM)
... moment measures (mean, standard deviation, skewness, kurtosis), as well as supplemental median and modal diameters. After derivation of the individual...
1975