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The AAPG/Datapages Combined Publications Database

Showing 22,396 Results. Searched 191,769 documents.

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ABSTRACT: Distribution Patterns of Porosity and Permeability in the Hydrocarbon Bearing Sands of the Agbada Formation, Niger Delta Continental Shelf, Nigeria; #90108 (2010)

George A. Chiamogu and Olugbenga A. Ehinola

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... rocks. Porosity ranges from 3.6% to 39.4%, a mean of 21.92%, standard deviation of 8.91. The horizontal permeability ranges from 0.08 to 9990...



Mohamed Hossny Elzarka

Journal of Petroleum Geology

..., relative centre of gravity, variance, covariance and relative standard deviation; and tripartite and entropy facies parameters have been calculated...


First and Second Degree Regression Correlation of the Size Analysis Statistical Parameters of Trask, Inman, Folk and Ward, and Friedman: NOTES

W. D. Sevon

Journal of Sedimentary Research (SEPM)

... of calculation of mean and standard deviation (sorting) and only some correlation improvement by use of the second degree regression. FOLK, R. L...


Application of Moments to Vertical Variability Maps of Stratigraphic Units

W. C. Krumbein , W. G. Libby

AAPG Bulletin

... cable to mean bed thickness and standard deviation of thickness, so that it can be applied either to position or magnitude of individual beds or zones...


Recognition of a Relationship between Depth and Macroboring Distribution in Growth Framework Reef Cavities, Bonaire, Netherlands Antilles

David R. Kobluk, Miran Kozelj

CSPG Bulletin

... of boreholes with depth, and the standard deviation of the cross-sectional areas with depth. The regression of standard deviation on mean borehole...


A Grain Size Analysis of Longshore-Bars and Troughs, Lake Superior, Ontario

John S. Mothersill

Journal of Sedimentary Research (SEPM)

... by a number of sedimentologists to determine whether parameters such as skewness, kurtosis, standard deviation, and grain size are related to depositional...


Student Operator Error in Determination of Roundness, Sphericity, and Grain size

Robert L. Folk

Journal of Sedimentary Research (SEPM)

... of mean roundness and roundness standard deviation. Experimental error in determination of mean roundness from counts of fifty grains was ±0.35...


A Profile of the Four Moment Measures Perpendicular to a Shore Line, South Haven, Michigan

William T. Fox, John W. Ladd, Michael K. Martin

Journal of Sedimentary Research (SEPM)

..., offshore bar, and offshore area to study the changes in the first four moments. The mean grain size and standard deviation reached a maximum in the plunge...


Textural Analysis with Texas Instruments 59 Programmable Calculator: RESEARCH-METHOD PAPER

D. Joe Benson

Journal of Sedimentary Research (SEPM)

... mean, standard deviation, skewness, and kurtosis. The program is written for use with Texas Instruments, T.I. 59 programmable calculator...


A Critique of Methods for Comparing Heavy Mineral Suites

Edward J. Young

Journal of Sedimentary Research (SEPM)

...). If the formula for standard deviation, = [D2]/[2N] (Youden, 1951), is used where D=difference or range of two values and N=number of pairs...


Practical Comparison of Methods of Computing Grain-Size Parameters: ABSTRACT

Donald E. Owen, Roy L. Ingram

AAPG Bulletin

... consistently were appreciably higher than moment standard deviation. Cadigan's S and Otto's and Inman's ^sgr^phgr produced irregular values averaging...


Use of Dolostone Rhythmite Stratigraphy to Interpret Origin of Cross-Cutting and Manto Breccias Hosting a Lead-Zinc Deposit at Robb Lake, Northeastern British Columbia: ABSTRACT

F. T. Manns

AAPG Bulletin

... 2.8 m in thickness with a standard deviation of 1.8 m (N = 1,295). Poorly defined rhythmites in the highly brecciated lower half of the succession...


Considering the Vertical Variation in Rock Mechanical Properties of a Lithologic Zone Using Laboratory Derived Data … Is it Time for Geomechanical Stratigraphy?; #120191 (2015)

Douglas E. Wyatt, Jesse Hampton, Dandan Hu, Cheng Chen, Vladimir Martysevich

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... be possible to map strata of approximately equal values of rock properties only looking to the values outside of the first standard deviation...


Estimation of Recent Sediment Size Parameters from a Triangular Diagram

William J. Plumley, Donald H. Davis

Journal of Sedimentary Research (SEPM)

..., such as the mean and median, which are measures of the central tendency; the quartile deviation and standard deviation, which are measures of the sorting...


A Visual Comparator for Degree of Sorting in Thin and Plane Sections: REPLY

James Harrell

Journal of Sedimentary Research (SEPM)

... of frequency was numbers of spheres in each size class. The standard deviation (or "sorting") of the diameters, for both the whole and randomly sectioned...


Use and Misuses of the -Scale: DISCUSSION

J. W. Pierce, R. R. Graus

Journal of Sedimentary Research (SEPM)

....) End_Page 1348----------------------- when they are reported as a -mean and -standard deviation or as plotted histograms showing only a -scale...


Textural Parameters: AN EVALUATION

R. J. Moiola, D. Weiser

Journal of Sedimentary Research (SEPM)

... between beach and inland dune sands and coastal dune sands; the combination of mean diameter vs. standard deviation is most effective in differentiating...


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