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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 196,121 documents.
Bottom Currents And Sediment Transport on San Pedro Shelf, California
David E. Drake, David A. Cacchione, Herman A. Karl
Journal of Sedimentary Research (SEPM)
... prominent patch of relict sand south of the Los Angeles Harbor (Fig. 1). This sand has a mean diameter of 300 µm, standard deviation of 0.8 , and skewness...
1985
Comparing Sea-Ice Sediment Load With Beaufort Sea Shelf Deposits: Is Entrainment Selective?
Erk Reimnitz , Michael McCormick , Jens Bischof , D.A. Darby
Journal of Sedimentary Research (SEPM)
..., coarser sediments on the shelf generally are better sorted than finer sediments. No obvious relationship is seen between mean grain size and skewness...
1998
Quantitative Outcrop Data for Flow Simulation
Brian J. Willis , Christopher D. White
Journal of Sedimentary Research (SEPM)
... is the geometric mean, m is the arithmetic mean, sd is the standard deviation, sk is skewness, and cv is the coefficient of variation. End_Page 792...
2000
Minimum Saturations and Buoyancy in Secondary Migration
L. M. Hirsch, A. H. Thompson
AAPG Bulletin
... equilibrium (i.e., when invasion is slow and dynamic effects are negligible). We incorporate a measure of the skewness of a pore-size distribution...
1995
Effects of extractable organic matter from mature lacustrine shale on the pore structure and their implications
Yuhong Lei, Xiaorong Luo, Xiangzeng Wang, Ming Cheng, Likuan Zhang, Zhenjia Cai, Lixia Zhang, Chengfu Jiang, Qian Ping Zhao, and Jintao Yin
AAPG Bulletin
...) of nonextracted samples can be divided into three patterns (Figures 5, 6; Table 3). (1) The first pattern shows a skewness left distribution, in which the pores...
2022
Recent Sedimentation at the Mouth of Rustico Harbour, Prince Edward Island
J. W. Rowling
Atlantic Geology
... and skewness w e r e plotted on m a p s of the r e g i o n . T h e sediments are strongly b i m o d a l , some are p o l y m o d a l , and all are extremely w e...
1965
PORE SYSTEMS AND RESERVOIR QUALITY IN MISSISSIPPIAN CARBONATES AND THEIR RELATIONSHIP TO HYDROCARBON RESERVOIRS IN SOUTHERN SASKATCHEWAN
D. M. KENT, R. J. LEIBEL, S. C. ERIYAGAMA
Williston Basin Symposium
... size, standard deviation of pore throat size (uniformity or sorting of pore throat size) and skewness of pore throat size. Over the past...
1982
Geological Causes of Local Variation in Coastal Bluff Recession Rates, Northeast Ohio Shoreline of Lake Erie
Scott A. Dawson, James E. Evans
Environmental Geosciences (DEG)
..., standard deviation, and skewness) were calculated using the statistical methods of Folk and Ward (1957). Porosity was calculated from saturated samples...
2001
Mineral Composition and Sediments in Eastern Long Island Sound, New York
Benjamin N. Akpati
Atlantic Geology
... groups based on plots of A: Phi standard de viation vs. mean grain size; B: Phi skewness vs. mean grain size. Group 1 represents sandy gravel; 11...
1974
Key Properties are not Well Represented by Means: Spatial Asymmetry in Coal Seam Gas Reservoir Modelling
Sebastian Hoerning, Iain Rodger
Unconventional Resources Technology Conference (URTEC)
... the spatial extension of the univariate skewness, the third order statistical moment which describes the degree and direction of the deviation from...
2021
An Approach to Include Scale-Dependent Surface Roughness in Hydraulic Fracturing Simulation
Abbas Movassagh, Saeed Salimzadeh, Elaheh Arjomand, Manouchehr Haghighi
Unconventional Resources Technology Conference (URTEC)
... directions. Also, the surface asperities may skew to a dominant direction, and skewness may change locally (Bahat et al., 2003). These topological...
2021
Physical Parameter Distribution Patterns in Bottom Sediments of the Buctouche Bay Complex
J. Thibault
Atlantic Geology
... and (or) transported sand material. Sand Texture Although textural parameters such as mean, standard deviation and skewness have been shown...
1978
COAL RESOURCES OF THE CAHABA COALFIELD
Richard E. Carroll, Jack C. Pashin
Alabama Geological Society
..., positive skewness and is markedly platykurtic. Mean ash, as calculated for log normally distributed data, is 6.76 weight percent, a typical percentage...
1999
Auto-Control Model Building Using Machine Learning Regression for Extreme Response Prediction
Darrell Leong, Anand Bahuguni
Australian Petroleum Production & Exploration Association (APPEA) Journal
... recovering PST(). For this application, modelling SGLD parameters r and s in place of skewness and kurtosis yields the practical advantage of post-processing...
2020
Central Sumatra and the East African Rift Lake Sediments: An Organic Geochemical Comparison
Barry J. Katz, Peter A. Kelley
Indonesian Petroleum Association
..., and only a fraction of this percent represents potential or effective petroleum source rocks. Compounding this is the skewness of the record toward...
1987
Channel Sequences and Braided Stream Development in the South Canadian River, Hutchinson, Roberts, and Hemphill Counties, Texas
L. G. Kessler, II, Fred G. Cooper
GCAGS Transactions
... in such parameters as mean grain diameter, sorting, skewness, and kurtosis. This lack of change was attributed to the lack of erosional vigor in the Canadian...
1970
Petrology and Diagenesis of Tertiary Aquifer Carbonates, North Carolina
Paul A. Thayer , Daniel A. Textoris
GCAGS Transactions
... (1958), shows a slight, but erratic, upward coarsening. Skewness (SkI) increases upward to 5.2 m, and then decreases slightly. Kurtosis (KG) follows...
1972
Sediment Sorting in Alluvial Channels
Lucien M. Brush Jr.
Special Publications of SEPM
... also tend to follow a normal distribution transport through differential element of dq chosen except for small values of minor skewness develops...
1960
Geologic Studies in Baja California; Frontmatter and Roadlog
Patrick L. Abbott
Pacific Section SEPM
... sorted, fine sandstone (F 6 5 M 0 C26P9). The sandstone is unimodal with a mean grain size of 0.175 mm, sorting = 1.82 0, skewness = +0.305 (fine skewed...
1989
The Geological Heritage Values and Potential Geotourism Development of the Beaches in Northern Sabah, Malaysia
Joanes Muda
Geological Society of Malaysia (GSM)
.... The statistical parameters calculated in phi (Φ) units were mean particle size, standard deviation (sorting), skewness and kurtosis. Semi-quantitative...
2013
Beaches
James H. C. Martens
Special Publications of SEPM
... Median Diam. Mm. CorJ. of Sorling Coef. of Skewness Max. Min. Max. Min. 22 37 .048 0.23 0.35 0.70 0.15 0.33 1.41 1.53 1.16 1.32 1.14 1.27 1.15...
1955
Tidal Lagoon Sediments on the Mississippi Delta
W. C. Krumbein
Special Publications of SEPM
... may be made of the "sorting" values, the skewness, the carbon content, and the like. Figure 7 is the frequency curve of the phi medians of all...
1955
The Sediments of Lake Elsinore, Riverside County, California
John F. Mann, Jr.
Journal of Sedimentary Research (SEPM)
... rich in hornblende. The skewness toward the finer sizes may result from a concentration of smaller grains of hornblende with the larger grains of quartz...
1951
Correlation of the Tills of Northeastern Ohio by Size Analysis
V. C. Shepps
Journal of Sedimentary Research (SEPM)
..., as will be shown later. Since no correlation or significance was found in the skewness or the quartile deviations of the samples these have not been tabulated...
1953
Thickness of Strata
Vincent C. Kelley
Journal of Sedimentary Research (SEPM)
.... It may be noted with the hypothetical Beta formation (figs. 3, 4) that all the medians are less than the means which fact reflects the skewness...
1956