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The AAPG/Datapages Combined Publications Database
Showing 1,682 Results. Searched 200,635 documents.
Penecontemporaneous Dolomitization in Sabkha Faishakh, Qatar: Evidence from Changes in the Chemistry of the Interstitial Brines
Leslie V. Illing , John C. M. Taylor
Journal of Sedimentary Research (SEPM)
.... The slope of the line calculated by least squares for the sabkha samples is 0.81, with a correlation coefficient of 0.91. The intercept on the sulfate...
1993
Downstream Changes in the Lithology and Grain Size of Fluvial Gravels, the Watarase River, Japan: Evidence of the Role of Abrasion in Downstream Fining
Yoshinori Kodama
Journal of Sedimentary Research (SEPM)
... to Sternberg's law (1875). The rate of size diminution obtained by least-squares regression is D = 65e-0.089X, where D is median diameter in mm at X km...
1994
Isotopic and Elemental Geochemistry of Black Sea Sediments: Geochemistry
John A. Cooper , E. Julius Dasch , Maureen Kaye
AAPG Special Volumes
.... 1458-1460. York, Derek, 1969, Least squares fitting of a straight line with correlated errors: Earth and Planetary Sci. Letters, v. 5, no. 5, p...
1974
Bed-Thickness Structure of Multi-Sourced Ramp Turbidites: Devonian Brallier Formation, Central Appalachian Basin
Carl N. Drummond
Journal of Sedimentary Research (SEPM)
... the direction of curvature of exponential distributions. Visual inspection coupled with least-squares analysis readily distinguishes the underlying form...
1999
Enhanced Sediment Scavenging Due to Double-Diffusive Convection
Jeffrey D. Parsons , Macelo H. Garcia
Journal of Sedimentary Research (SEPM)
... this study and Green (1987) were fitted using a least-squares technique. The experimental results, along with the curve-fit, are shown in Figure 7. The fit...
2000
Weibull vs. Lognormal Distributions for Fluvial Gravels
G.M. Kondolf , A. Adhikari
Journal of Sedimentary Research (SEPM)
.... (1981) and Tappel and Bjornn (1983) calculated coefficients of determination r2 values for least-squares regression lines fitted to grain-size...
2000
Resources for Paleoceanographic and Paleoclimatic Analysis: A 6,700-Year Stratigraphy and Regional Radiocarbon Reservoir-Age (ΔR) Record Based on Varve Counting and 14C-AMS Dating for the Santa Barbara Basin, Offshore California, U.S.A.
Arndt Schimmelmann, Carina B. Lange, E. Brendan Roark, B. Lynn Ingram
Journal of Sedimentary Research (SEPM)
... for that particular level in the core (Table 2). The error in the ΔR values is based on the least-squares difference of the 14C error of the equivalent marine model...
2006
Expanding Role of Computer in Geology
E. L. Dillon
AAPG Bulletin
... by the least squares method. The degree or "order" of the trend surface indicates the largest exponent in the equation for the surface, and thus...
1967
Principal Stress Ratios in Cretaceous Limestones from Texas Gulf Coast
M. Friedman , H. C. Heard
AAPG Bulletin
.... It is apparent however, when a least-squares line is passed through the midpoints of the data bars (Table 2; Figs. 2, 3). DISCUSSION OF RESULTS Although...
1974
Gas-Hydrate Horizons Detected in Seismic-Profiler Data from the Western North Atlantic
Brian E. Tucholke , George M. Bryan , John I. Ewing
AAPG Bulletin
... used is Vp = 1.58 + 1.24 t/2 km/sec, where t is the two-way travel (reflection) time; this velocity function is a least squares fit for sonobuoy...
1977
Rubidium-Strontium Minimum Ages of Sedimentation, Uranium Mineralization, and Provenance, Morrison Formation (Upper Jurassic), Grants Mineral Belt, New Mexico
Moon J. Lee , Douglas G. Brookins
AAPG Bulletin
..., Uranium deposits of the Grants region, New Mexico: Wyoming Geol. Assoc. Earth Sci. Bull., v. 5, p. 3-12. York, D., 1969, Least squares fitting...
1978
Analysis of Gravity Anomaly Over Coral-Reef Oil Field: Wilfred Pool, Sullivan County, Indiana
Stephen W. Dana
AAPG Bulletin
... of Wilfred pool. End_Page 408------------------------------ A plot of averages against distance was made, and a least-squares analysis calculated...
1980
Crustal Structure in Gulf of Mexico from OBS Refraction and Multichannel Reflection Data
A. K. Ibrahim, J. Carye, G. Latham, R. T. Buffler
AAPG Bulletin
... by least squares, and the apparent velocities were calculated at each end of the profile. The standard deviation with respect to least square fitted lines...
1981
Source and Migration of Light Hydrocarbons Indicated by Carbon Isotopic Ratios
R. H. Reitsema, A. J. Kaltenback, F. A. Lindberg
AAPG Bulletin
... of gas from canned cuttings, although there were some significant exceptions. The trend line for head space in canned cuttings, based on the least-squares...
1981
Model to Evaluate Exploration Strategies
David Austin Jones, Neal A. Buck, Jack Harris Kelsey
AAPG Bulletin
... of exploration. Equation 3 is used to calculate the parameters Fi(w), Fi(^infinity), and C simultaneously by fitting a least squares curve to the time series...
1982
Effects of Oil and Gas Accumulation on Water Movement: GEOLOGIC NOTES
Richard E. Chapman
AAPG Bulletin
... pressure measurements. Data plotted as least squares correlation lines over approximate range of each set of data. Correlation coefficient is statistically...
1982
Pristane, Phytane, and Lower Molecular Weight Isoprenoid Distributions in Oils
Harold A. Illich
AAPG Bulletin
... that a large amount of the pristane is directly related to the amount of phytane present. It is noteworthy that the lines of best fit (least-squares method...
1983
Thermal History of Michigan Basin
Karen Rose Cercone
AAPG Bulletin
... by linear least squares analysis: Master's thesis, University of Michigan, Ann Arbor, 95 p. Dorr, J. A., Jr., and D. F. Eschman, 1971, Geology of Michigan...
1984
The Ubiquitous Overbid
R. E. Megill, R. B. Wightman
AAPG Bulletin
... of Mexico, are omitted from the least-squares fit of the data points shown on Figure 4. The correlation coefficient for the trend line plotted is 0.65...
1984
Application of an Inverse Method for Calculating Three-Dimensional Fault Geometries and Slip Vectors, Nun River Field, Nigeria
Hugh G. Kerr, Nicky White
AAPG Bulletin
... >= 2. The least-squares misfit function is a measure of the difference between these calculated faults. The correct values of these parameters...
1996
Determination of the stable isotope composition and total dissolved solids of Athabasca oil sands reservoir porewater: Part 1. A new tool for aqueous fluid characterization in oil sands reservoirs
Benjamin R. Cowie, Bruce James, Michael Nightingale, and Bernhard Mayer
AAPG Bulletin
... to the determination of water isotope compositions. A least-squares regression line was generated for the TDS– system, and the equation was solved using the value...
2014
Geophysical characterization of a leachate plume from a former municipal solid waste disposal site: A case study on Norman landfill
Md. Iftekhar Alam, Andrew Katumwehe, and Estella Atekwana
AAPG Bulletin
... downloaded from Syscal and inverted using Res2DInv software to obtain an acceptable resistivity section using a least-squares inversion technique (Loke...
2022
Seismic Based Characterization of Baturaja Carbonate at 3D Topaz Area; #50531 (2012)
Indra Yuliandri, Totong Usman, and Muharram Panguriseng
Search and Discovery.com
..., U.S.A., 608 p. Lines, L.R. and S. Treitel, 1984, A review of least-squares inversion and its application to geophysical problems: Geophysical...
2012
EIA Expanded Geographic Coverage of Oil and Natural Gas Production: EIA-914 Survey Expansion and its Implications on EIA Reporting and Forecasting, #70237 (2017).
Gary Long, Jeffrey Little, Barbara Mariner-Volpe, Neal Davis, Elizabeth Panarelli, Emily Geary, Olga Popova
Search and Discovery.com
..., Inc. (DI) and data reported on Form EIA-914. The relationship between DI data and Form EIA-914 data is modeled using a Weighted Least Squares (WLS...
2017
The Dynamic Interplay of Oil Mixing, Charge Timing, and Biodegradation in Forming the Alberta Oil Sands: Insights from Geologic Modeling and Biogeochemistry
Jennifer Adams, Steve Larter, Barry Bennett, Haiping Huang, Joseph Westrich, Cor van Kruisdijk
AAPG Special Volumes
... multivariate statistical methods (such as alternating least squares deconvolution methods).Finally, it is likely that the complexity of the petroleum systems...
2013