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The AAPG/Datapages Combined Publications Database

Showing 22,022 Results. Searched 190,142 documents.

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Suggested Use of Bed Thickness Measurements in Strati Graphic Description: ERRATA

John Bokman

Journal of Sedimentary Research (SEPM)

... of Bed Thickness Measurements in Stratigraphic Description" by John Bokman, September 1957, on page 335 the statement that the standard deviation is equal...

1957

Comparison of Moment Measures for Sieving and Thin-Section Data in Sedimentary Petrological Studies

Gerald M. Friedman

Journal of Sedimentary Research (SEPM)

... to obtain sieve-size mean from thin-section mean. For mean deviation and standard deviation, a linear relationship holds between sieving and thin...

1962

Abstract: Determining the heterogeneity of Reference Materials

Thomas E. Bagley, Clifford R. Stanley, John D. Murimboh

Atlantic Geology

... to determine the heterogeneity of a reference material to separate the analytical and inter-lab errors from the standard deviation. Reference materials...

2014

Abstract: Determining the Heterogeneity of Reference Materials

Thomas E. Bagley, Clifford R. Stanley, John D. Murimboh

Atlantic Geology

... materials for which an accepted concentration and standard deviation have been determined by independent labs. Ideally, geoscientists can use Certified...

2015

The Angular Deviation of Paleocurrent Directions as Applied to the Calculation of Channel Sinuosities

J. P. Le Roux

Journal of Sedimentary Research (SEPM)

... and published a graph plotting the circular standard deviation for the wrapped normal distribution against the vector magnitude as determined by vector...

1994

Comparison of Phi Percentile Deviations

William F. Tanner

Journal of Sedimentary Research (SEPM)

... not been done generally. Inman (1952) adopted the standard deviation, obtained by a graphic approximation, as follows: = (84 - 16). This had been...

1958

A New Approach to Time Depth Conversion and Depth Error Estimation for 2D Interpretation Using Seismic Velocities

Rosidah Hardiani, Sanisah Soed, Lothar Schulte

Indonesian Petroleum Association

... discrepancy the velocity differences at intersecting 2D lines were calculated. For each 2D time horizon the resultant residual velocity standard deviation...

2013

Abstracts: Automatic P-wave Arrival Time Picking Method for Seismic and Microseismic Data; #90173 (2015)

Jubran Akram

Search and Discovery.com

... significant in the processing of seismic and microseismic data. The method presented here is based on the standard deviation in a moving time window...

2015

PHi Mean and Phi Standard Deviation of Grain-size Distribution in Sediments: Method of Moments

Mounir T. Moussa

Journal of Sedimentary Research (SEPM)

...PHi Mean and Phi Standard Deviation of Grain-size Distribution in Sediments: Method of Moments Mounir T. Moussa 1977 Vol. 47 No. 3. (September...

1977

Synthetic Deviation: A New Dipmeter Interpretation Method

Charles R. Berg

AAPG Bulletin

...Synthetic Deviation: A New Dipmeter Interpretation Method Charles R. Berg 1998 1133 1139 82 (1998) 6 Synthetic deviation (SYNDEV) plots are derived...

1998

Graphical Aids for Determining Reliability of Sample Means and an Adequate Sample Size

John M. Dennison

Journal of Sedimentary Research (SEPM)

.... CONFIDENCE INTERVALS FOR MEANS Statistical theory also shows that the standard deviation of a mean (x) of n0 observations constituting a random...

1962

ABSTRACT: Probability Statistics in the Analysis of Coal Blends

David E. Pearson

The Society for Organic Petrology (TSOP)

.... In probability graphs therefore, single coals plot as straight lines, the slopes of which depend upon the standard deviation of the readings, whereas...

1990

An Improved Method for Calculating the Standard Deviation and Variance of Paleocurrent Data: RESEARCH METHOD PAPER

Robert G. F. Krause , Theresa A. M. Geijer

Journal of Sedimentary Research (SEPM)

...An Improved Method for Calculating the Standard Deviation and Variance of Paleocurrent Data: RESEARCH METHOD PAPER Robert G. F. Krause , Theresa A. M...

1987

O18--O16 Ratios of Evaporitic Dolomite from the Mississippian Charles Formation and Their Significance to the Dolomite Problem: ABSTRACT

Jon N. Weber

AAPG Bulletin

... marine calcite limestones of the same age (^dgrO18 = -6.21, standard deviation = 0.89%), the dolomite is depleted in O16 to the extent of 6.85 per mil...

1965

Testing Graphical Methods of Grain-Size Analysis of Sandstones and Siltstones

R. A. Cadigan

Journal of Sedimentary Research (SEPM)

... on Students' "t" distribution is suggested for comparing computed standard deviation or other parameters of a grain-size distribution with those determined...

1954

Moment and Graphic Size Parameters in the Sediments of Lake Geneva (Switzerland)

J.-M. Jaquet, J.-P. Vernet

Journal of Sedimentary Research (SEPM)

... (mean, standard deviation, skewness, and kurtosis) were computed according to the formulas given by Coakley and Beal (1972): for normal distributions...

1976

Estimation of Arithmetic Permeability from a Semi-Log Porosity/Log10 Permeability Regression; #41583 (2015)

Gregory Benson

Search and Discovery.com

... defined as a function of the standard deviation of the porosity-permeability point cloud residual around the geometric regression (Figure 7). The equation...

2015

Eolian Sedimentology Interpreted from Dipmeter Results: ABSTRACT

R. D. Nurmi, V. R. Hepp

AAPG Bulletin

... efficient and reliable dip (arrow) plots for interpretation of structural and depositional dips. Structural tilt and borehole deviation, which make...

1979

A Criticism of Certain Usage of the Phi-Notation

Dean A. McManus

Journal of Sedimentary Research (SEPM)

... are: (1) the mistaken correlation of "" and "millimeters," (2) the misuse of in the expression of values of the standard deviation, and (3) the misuse...

1963

Abstract: Examination Of Microseepage Based Surface Geochemical Anomalies Vis-À-Vis Hydrocarbon Production Data; #90315 (2017)

Minaxi Bansal, Nitin Gupta, Sajid Daruwala, Ketan Parmar, S.N. Rai, Atanu Banerjee

Search and Discovery.com

... campaign, the outlier data points exhibiting more than 3 standard deviation values from the sample mean were screened from the initial data set...

2017

Estimation of Natural Gas Reserves

P. McDonald Biddison

AAPG Special Volumes

... standard temperatures may be computed from the analysis of the gas and the determined deviation of the individual constituents. However, at pressures...

1935

Suggested Use of Bed-Thickness Measurements in Stratigraphic Descriptions

John Bokman

Journal of Sedimentary Research (SEPM)

... of stratification in sedimentary rocks in terms of the mean thickness and standard deviation of beds is suggested. The procedure is outlined and illustrated...

1957

Analysis of Variance Applied to Measures of Central Tendency and Dispersion in Sediments

Wayne C. Isphording

Journal of Sedimentary Research (SEPM)

... of accuracy results if the standard deviation of either beach or river sediments is computed, using 1.0 phi data, (4) significant differences from...

1972

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