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The AAPG/Datapages Combined Publications Database
Showing 800 Results. Searched 195,688 documents.
Water/Oil Displacement by Spontaneous Imbibition Through Multiscale Imaging and Implication on Wettability in Wolfcamp Shale
Sheng Peng, Yijin Liu, Lucy Tingwei Ko, William Ambrose
Unconventional Resources Technology Conference (URTEC)
... that are relatively smaller in size; and 2) clean clay mineral pores that are larger. However, no bimodal distribution or skewness exists in the R distribution...
2019
Petrology of the Simsboro Formation of Northeast Central Texas
Donald W. Kohls
Journal of Sedimentary Research (SEPM)
... in [1]/[]4 phi intervals. The mean size, MZ; inclusive, standard deviation, I; skewness, SKI; and kurtosis, KG, were determined by the graphic method...
1967
Water and Sediment in the Norris Glacier Outwash Area, Upper Taku Inlet, Southeastern Alaska
Roger M. Slatt, Charles M. Hoskin
Journal of Sedimentary Research (SEPM)
..., cumulative curves were constructed on arithmetic coordinate paper, and mean size, standard deviation (sorting), skewness, and kurtosis were calculated...
1968
The Sedimentology of a Braided River
Peter F. Williams , Brian R. Rust
Journal of Sedimentary Research (SEPM)
... percentile (C), graphic standard deviation (G) (Folk, 1968, p. 45), simple sorting measure (Sos), simple skewness (s) (Friedman, 1967, p. 329) and graphic...
1969
Pore structure characterization of middle- and high-ranked coal reservoirs in northern China
Haihai Hou, Longyi Shao, Yue Tang, Zhen Li, Sheng Zhao, Minglei Yao, Xuetian Wang, and Jiaqiang Zhang
AAPG Bulletin
... in Table 3, containing the parameters of ΦHe, kA, displacement pressure (PD), sorting coefficient, kurtosis, skewness, pore radius, maximum intrusion...
2023
Direct Current Resistivity Method for Shallow Hydrocarbon Exploration
Aditya A. Juanda, Andika P., David P. Sahara, Dhea Wachju D., Reza P. A. B., Eko Mario C. L., Warsa
Indonesian Petroleum Association
... the principle that we used is curve matching, where changes in skewness is the indicator of depth changes. The target of this 1D processing is geological...
2008
Petroleum Reserves: A Proposal for Methodology and Classification
Jean M. Bourdaire, Ronald Pattinson
Indonesian Petroleum Association
... can be very large but cannot be negative. Both the shape and the skewness strongly suggest a log-normal model with a lower bound equal to zero...
1985
Distribution and Localization of Gold in Meguma Group Rocks, Nova Scotia: Implications of Metal Distribution Patterns in Quartz Veins and Host Rocks on Mineralization Processes at Harrigan Cove, Halifax County
J. H. Crocket, F. Fueten, P. M. Clifford, A. Kabir
Atlantic Geology
... i l l u s t r a t e the pronounced positive skewness of the metal distribution. The main purpose of the averages (Table 2) is to recognize...
1986
Effects of Bioturbation on Sediment Properties
A. A. Ekdale, R. G. Bromley, S. G. Pemberton
Special Publications of SEPM
... (from well-sorted to poorly sorted) and an increase in skewness (from a symmetrical to strongly fine-skewed distribution). Another deposit-feeding...
1984
RECOGNIZING TRACES OF SNAIL PREDATION ON THE CARIBBEAN SAND DOLLAR LEODIA SEXIESPERFORATA
TOBIAS B. GRUN
PALAIOS
... and drill hole parameters including abundances. Key: N ¼ sample size; mad ¼ median absolute deviation, skewness ¼ skewness of distribution. Total Test length...
2017
Fine-Grained Debris Flows In Coarse-Grained Alluvial Systems: Paleoenvironmental Implications For the Late Paleozoic Fountain and Cutler Formations, Colorado, U.S.A.
Dustin E. Sweet
Journal of Sedimentary Research (SEPM)
... (1957) method, the average sorting is 3.07 φ as indicated by one standard deviation (σ1) of the distribution and the average skewness is 0.21 φ...
2017
Quantification of Permeability Structure in Distributary-Channel Deposits, Ferron Sandstone, Utah1
Mark D. Barton, Noel Tyler
Utah Geological Association
... of skewness, (2) central tendency as estimated by the arithmetic mean, and (3) variance as estimated by the coefficient of variation. Results are summarized...
1991
Sedimentary History of the Ventura Basin, California, and the Action of Turbidity Currents
M. L. Natland, Ph. H. Kuenen
Special Publications of SEPM
... and for the Trask coefficient of skewness to increase. Bed III is perfectly but slightly graded and shows no marked variation in sorting or skewness...
1951
Quaternary Sedimentation on the Tectonically Active Oregon Continental Slope
L. D. Kulm, K. F. Scheidegger
Special Publications of SEPM
... as deviation mean sorting diameter in versus Figure 14 skewness and Olive gray and CLAY SAND given opposite the much smaller drainage central Oregon...
1979
Variance in reservoir quality due to diagenesis: A study from tidal deposits, Nyalau Formation, Sarawak, East Malaysia
Azirahtul Atifah Mohamed Sabri, Numair A. Siddiqui
Geological Society of Malaysia (GSM)
... of symmetry distribution, the skewness measurement for all the samples is coarse to very coarse skewed, indicating a dominance of coarse material...
2018
A System for Regional Lithofacies Mapping
D.A. Clark
CSPG Bulletin
... are compiled. In addition, vertical variability measurements such as the centre of gravity, standard deviation, skewness, elevation of first (topmost...
1981
Structural Conditions in Coal Mines of the Canmore Area, Alberta
D. K. Norris
CSPG Special Publications
... parallel to the bedding. The skewness of the curves may be due to inadequate sampling and/or tilting of the principal stress axes with respect...
1956
Beach Sands of the Mediterranean Coast of Egypt
Mohamed E. Hilmy
Journal of Sedimentary Research (SEPM)
... quartile, Q1; the coefficient of sorting, So; the coefficient of skewness, Sk; and kurtosis, K, were calculated from the cumulative curves...
1951
Studies on the Quaternary Geology of Peninsular Malaysia
T. Suntharalingam
Geological Society of Malaysia (GSM)
... indicate that the sand is unimodal and sorting is poor to very poor. Skewness of the alluvium is fine to strongly fine. Kurtosis for samples in which...
1984
Petrology of the Whita Sandstone, Southern Scotland
A. E. M. Nairn
Journal of Sedimentary Research (SEPM)
... of samples 1-5 showing the alignment of the long axes of quartz grains in the bedding plane section. End_Page 60------------------------- skewness...
1958
Size and Shape of Rock-fragments in Tuscarora Scree, Fishing Creek, Lamar, Central Pennsylvania
J. C. Griffiths
Journal of Sedimentary Research (SEPM)
... to be a very stable estimator of the asymmetry of the population from which the sample of 88 was drawn, but as far as these data are concerned the skewness...
1959
Recent Horizontal Drilling in Lockhart Crossing Field, Livingstone Parish, Louisiana: Its Impact on Geological Interpretation
Randy J. Johnson
GCAGS Transactions
..., the sorting coefficient, the skewness, and the kurtosis (Griffin, 1991). A sample photograph (visible light) of the IPCO #6 shows very fine to fine-grained...
1993
Predicting the Permeability of Unconsolidated Sediments From Grain Size Measurements
Eve S. Sprunt, Ron E. Gilliland, Mary L. Barrett
GCAGS Transactions
... accounts for a number of nonexplicit factors that must be kept constant such as grain shape, packing, and skewness, d is the geometric mean diameter...
1993
Electronic Data Processing In Sedimentary Size Analyses
Joe S. Creager, Dean A. McManus, Eugene E. Collias
Journal of Sedimentary Research (SEPM)
... positive skewness, and more leptokurtosis. If these types, the sand-mud ratio and Shepard's class are plotted for the samples from an area...
1962
The economic environment and the growth in reserves from known gas fields in the Gulf of Mexico
Kevin F. Forbes, Ernest M. Zampelli
CSPG Bulletin
.... Additionally, the ln(AGF) distribution is characterized by much less skewness and kurtosis than is the AGF distribution. Data were pooled based on the year...
2012