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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,549 documents.
Depositional Environments of the Norphlet Formation (Jurassic) for Southwestern Alambama
Fred Pepper
GCAGS Transactions
...-sensitive scatter plot of skewness versus graphic mean (Fig. 7). The cross-strata at the top of the Denkman in this well are suggested to be coastal...
1982
A Theoretical Curve for Statistical Analysis of Sediments
E. Alan Lohse
Journal of Sedimentary Research (SEPM)
... commonly used (the median, deviation, skewness, and kurtosis) are likewise obtained or readily computed. Several of the moment measures are indicated also...
1955
ABSTRACT: Calibration of the Vitrinite Reflectance Geothermometer Using an Improved Resolution of the Peak Temperature from Reequilibrated Fluid Inclusions in Butial, Geothermal and Contact Metamorphic Environments
Charles E. Barker
The Society for Organic Petrology (TSOP)
...) with an increasing number of reflectance measurements. The skewness of the reflectance distribution also becomes increasingly negative, with an increasing number...
1992
Petrology of the Vindhyan Rocks Around Rohtasgarh, India
Dipankar Lahiri
Journal of Sedimentary Research (SEPM)
... variation of the skewness values as was observed by Folk and Ward. In the Murli Sandstone for which no thickness data is available, a regular southward...
1964
Sedimentary Properties and Processes on a Sandstone Hillside
P. H. Walker
Journal of Sedimentary Research (SEPM)
... Z = 2-, where Z is in mm. PARTICLE SIZE DATA Calculations were made of mean, standard deviation (), skewness (Sk) and kurtosis (K) using the moment...
1964
Discrimination of Depositional Environments Using Settling Tube Data
Asahiko Taira , Peter A. Scholle
Journal of Sedimentary Research (SEPM)
.... The grouping of reference and unknown sets for the tests is shown in Table 3. Using standard bi-variate plots of the mean, standard deviation, skewness...
1979
Recent Marine Sediments from Alaskan and Northwest Canadian Arctic
Alfred J. Carsola
AAPG Bulletin
... as modified by Krumbein and Pettijohn (1938, pp. 230-31),(FOOTNOTE 4) where S0=
1954
A Digital System for Recording and Rapidly Processing Settling-Tube Data: RESEARCH METHOD PAPER
R. A. Robinson, R. H. Osborne, D. S. Gorsline, M. C. Robertson
Journal of Sedimentary Research (SEPM)
.... The mean size, standard deviation, skewness, and kurtosis is calculated for each sample. Size distributions are determined using one of two methods...
1995
Lower Cretaceous Sandstone Reservoirs, Israel: Petrography, Porosity, Permeability
Haya Shenhav
AAPG Bulletin
... sections are represented only by the mean size (Mz), standard deviation (^sgrI) and skewness (SkI). In a few samples, a comparison was made between...
1971
Sedimentology Of Prealpine Flysch Sequences, Switzerland
John F. Hubert
Journal of Sedimentary Research (SEPM)
... deviation, and skewness for the graded sandstones and siltstones are similar to scatter diagrams for sandstones and siltstones deposited by normal bottom...
1967
Multi-scale joint characterization of braided river dominant facies: A case study of C1 oilfield in the Bohai Bay basin
Feiteng Wang, Zhang Zhang, Hongliang Song, Jingmin Guo, Xiaolong Zhang
International Meeting for Applied Geoscience and Energy (IMAGE)
... characteristics were analyzed. The results showed that the dominant areas have good sorting, coarse skewness, and relatively high mercury removal efficiency...
2023
Size and Sphericity of Quartz Grains in Two Turbidite Formations
Gerard V. Middleton
Journal of Sedimentary Research (SEPM)
... & Kendall, 1950, p. 159) were also calculated and are listed in table 10. From these the skewness may be calculated using the formula skewness =[ß1(ß2...
1962
Sediments of Charlotte Harbor, Southwestern Florida
Ter-Chien Huang, H. G. Goodell
Journal of Sedimentary Research (SEPM)
..., mean grain size, standard deviation, skewness, and kurtosis based on the textural analysis were computed by digital computer. The data together...
1967
Environmental Interpretation by Electron Microscopy: Dunvegan Formation, British Columbia: GEOLOGICAL NOTES
Monzer S. Shawa
AAPG Bulletin
...; standard deviation 1.4; skewness 0.3; kurtosis 1.5. Tabular crossbeds were seen in abundance in the Dunvegan Formation. Sedimentation units...
1973
Sedimentological Sampling and Results from the Diver Lock-Out Facility of the Submersible Shelf Diver, Bay of Fundy, Nova Scotia
Bernard R. Pelletier
Atlantic Geology
... for this relationship although it appears to be established by a mathematical relationship in the definition of the moments themselves. Values of skewness when plotted...
1970
Integrating Sieving and Laser Data to Obtain Bulk Grain-Size Distributions
Pedro Dinis, Ana Castilho
Journal of Sedimentary Research (SEPM)
... and preferred to the φ intervals, which require substantially more time for analysis. Statistical parameters (mean, sorting, and skewness...
2012
Sedimentology and Mineralogical Differentiation of Sandstones in the Fort Union Formation (Paleocene), Wind River Basin, Wyoming
James L. Courdin, John F. Hubert
Wyoming Geological Association
...), standard deviation (S), skewness (SK), and Kurtosis (K). These cross-bedded and horizontally-laminated sandstones were interpreted in the field as river...
1969
Beach Sediments of Trout Lake, Wisconsin
V. E. Mckelvey
Journal of Sedimentary Research (SEPM)
...] Phi skewness, Skq is computed: Skq=[(Q3+Q1)-2(Md)]/[2] Quoting from Krumbein (1939, p. 569): For descriptive and comparative purposes, Md (or its...
1940
A Code for Expressing Grain Size Distribution
K. O. Emery, Howard Gould
Journal of Sedimentary Research (SEPM)
... gives reasonably accurate estimates of the median diameter, skewness, and sorting coefficient. Grain diameters either in microns or in the phi notation...
1948
Roundness and Shape of Marine Gravels from Urk (Netherlands), a Comparison of Several Methods of Investigation
TJ. H. van Andel, A. J. Wiggers, G. Maarleveld
Journal of Sedimentary Research (SEPM)
... skewness in some distributions a d produces better sorting. For those distributions only the median retains a certain value. In table I the phi (FOOTNOTE...
1954
Continental Shelf and Upper Slope Sediments Off Portuguese Guinea, Guinea, and Sierra Leone, West Africa
Robert L. Mcmaster, John D. Milliman, Asaf Ashraf
Journal of Sedimentary Research (SEPM)
... the sands are very poorly sorted but most of St. Ann's Shoal is well-sorted. Skewness (SkI). In general the sands are negative skewed (i.e. toward the coarse...
1971
Effectiveness of Discriminating Beach, Dune, and River Sands by Moments and the Cumulative Weight Percentages
R. W. Tucker , H. L. Vacher
Journal of Sedimentary Research (SEPM)
...: skewness-kurtosis; skewness-standard deviation; skewness-mean; and mean-standard deviation. By use of discriminant analysis, the technique has been...
1980
Grain-Size Variation on Dunes in the Southwest Kalahari, Southern Africa
Ian Livingstone , Joanna E. Bullard , Giles F.S. Wiggs , David S.G. Thomas
Journal of Sedimentary Research (SEPM)
... 1999 Vol. 69 (1999), No. 3. (May), Grain-size parameters (mean, standard deviation, skewness, and kurtosis) were determined for 83 sediment samples...
1999
Original Characteristics of Clastic Quartz Grains
Harvey Blatt
Journal of Sedimentary Research (SEPM)
...). Standard deviation is 1.17; skewness is +.12; kurtosis is 1.03. This mean size is 38 percent coarser than Feniak's value and is 80 percent coarser...
1967
Depositional, Diagenetic, and Production History of the Upper Morrowan Buckhaults Sandstone, Farnsworth Field, Ochiltree County Texas
Timothy Wayne Munson
Oklahoma City Geological Society
...) mean grain size, skewness, kurtosis, and standard deviation using statistical methods derived by Folk and Ward (1957). Cumulative percentages...
1994