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The AAPG/Datapages Combined Publications Database
Showing 1,687 Results. Searched 200,983 documents.
Application of Lopatin's Method to Determine Burial History, Evolution of the Geothermal Gradient, and Timing of Hydrocarbon Generation in Cretaceous Source Rocks in the San Juan Basin, Northwestern New Mexico and Southwestern Colorado
Wendell A. Bond
Rocky Mountain Association of Geologists
... the line shown in Figure 3 is a least squares fit to the resulting loglog plot of l versus Ro. For comparison, T I Figure 3 also shows the line taken from...
1984
Isotopic Ages and Stratigraphic Control of Mesozoic Igneous Rocks in Japan
Ken Shibata , Tatsuro Matsumoto , Takeru Yanagi , Reiko Hamamoto
AAPG Special Volumes
... at the island arc: Kyushu Univ. Fac. Sci. Mem. ser. D, v. 22, p. 37-98. York, D., 1966, Least-squares fitting of a straight line: Canadian Jour. Phys., v. 44, p...
1978
Seismic Refraction and Reflection Studies in the Timor-Aru Trough System and Australian Continental Shelf: Convergent Margins
R. S. Jacobson , G. G. Shor Jr. , R. M. Kieckhefer , G. M. Purdy
AAPG Special Volumes
... variations from a sloping datum were in the second layer. Travel times were fitted to straight lines by a least-squares solution that requires that reverse...
1979
Real-Time Hydraulic Fracture Optimization Based on the Integration of Fracture Diagnostics and Reservoir Geomechanics
Panagiotis Dalamarinis, Paul Mueller, Dale Logan, Jason Glascock, Stephen Broll
Unconventional Resources Technology Conference (URTEC)
... geometries, a Ridge Regression model was fit to the data. The main advantage of Ridge Regression over Ordinary Least Squares (ODL...
2020
A Study of the Relations of Depth, Porosity and Clay Mineral Orientation in Pennsylvanian Shales
Mack Gipson, Jr.
Journal of Sedimentary Research (SEPM)
... estimations of the degree of association between two variables, or least squares methods. Correlation coefficients, simple and partial, were employed...
1966
Geophysical Evidence for Ancient Sea-Floor Spreading from Alpha Cordillera and Mendeleyev Ridge: Evolution of Arctic Ocean Basin
John K. Hall
AAPG Special Volumes
... ( = 3.15). A proposed history for the Amerasian basin since late Precambrian time suggests that the basin was affected by spreading at least once...
1973
A New Fracture Parameters Inversion Model Based on the Pressure of Shut-In Under Pressure-Dependent Leak-Off Conditions
Xiaodong Hu, Zhiyong Tu, Shou Ma, Mingming Liu, Fujian Zhou, Shu Jing
Unconventional Resources Technology Conference (URTEC)
...., 1990. Least squares best fit geometric elements, in: Mason J. C., Cox M. G. (Eds.), Algorithms for Approximation II. Springer US, Boston, MA, pp. 311...
2022
Surfactant EOR Improves Oil Recovery in a Depleted Eagle Ford Unconventional Well - A Case Study
I. Z. Ataceri, I. W. R. Saputra, A. R. Bagareddy, M. H. Elkady, D. S. Schechter, G. W. Haddix, V. A. Brock, K. H. Raney, C. W. Strickland, G. R. Morris
Unconventional Resources Technology Conference (URTEC)
... to stimulation. The “most likely” Arps decline curve, fit with least squares to the entirety of the pre-stimulation data (excluding two shut-in events...
2023
Quantitative Analysis of HFTS-2 Completion Designs Using Cross-well Strain Measurement
Joseph Mjehovich, Aishwarya Srinivasan, Wen Wang, Kan Wu, Ge Jin
Unconventional Resources Technology Conference (URTEC)
... fracture element under the assumption of linear elastic rock deformations. - Regularized Linear Least-Squares Inversion is applied to solve the system...
2023
Holocene Relative Sea-Level Changes and Coastal Stratigraphic Units on the Northwest Flank of the Baltimore Canyon Trough Geosyncline
Daniel F. Belknap, John C. Kraft
Journal of Sedimentary Research (SEPM)
... in the previous section, basal peats were used in least-squares regression analyses to form a local relative sea-level curve. Figure 7 shows the data...
1977
The Application of Borehole Image Logs to Fluvial Facies Interpretation
Marinus E. Donselaar, Jasper M. Schmidt
AAPG Special Volumes
... Ltd.The frequency-distribution model was computationally fitted to the borehole image log dip distribution data using the least-squares difference method...
2010
Clay Diagenesis in Wilcox Sandstones of Southwest Texas: Implications of Smectite Diagenesis on Sandstone Cementation
James R. Boles, Stephen G. Franks
Journal of Sedimentary Research (SEPM)
... expandability were made, and a best-fit linear equation was determined by the least squares method. From the equation, the weight percent of each oxide...
1979
Lenticular Gypsum: Occurrences in Nature, and Experimental Determinations of Effects of Soluble Green Plant Material on its Formation
Robert D. Cody
Journal of Sedimentary Research (SEPM)
... of gypsum precipitated at the end of an experimental run is shown as a function of time. Least squares regression analyses of the data leads to the following...
1979
Flume Experiments on Lower-Flow-Regime Bed Forms in Coarse Sand
Warren R. Costello, John B. Southard
Journal of Sedimentary Research (SEPM)
... spacing along the centerline in about the downstream half of the channel, where bed orms were fully developed. Computer-fitted least-squares straight lines...
1981
Carbonate Sedimentation And Diagenesis Associated With Mg-Ca-Chloride Brines: The Permian San Andres Formation in the Texas Panhandle
Amos Bein , Lynton S. Land
Journal of Sedimentary Research (SEPM)
... by least-squares analysis of detailed X-ray diffractometer data. Data were analyzed using the SPSS (Statistical Package for the Social Sciences) programs...
1983
Pollen, PB-210, and Opaque Spherules: An Integrated Approach to Dating and Sedimentation in the Intertidal Environment
James S. Clark , William A. Patterson III
Journal of Sedimentary Research (SEPM)
... excess activity from 6 cm to the surface dictate that this section be considered separately. Excluding the two surface values, least-squares analysis...
1984
Classification of Large-Scale Subaqueous Bedforms: A New Look at an Old Problem-SEPM Bedforms and Bedding Structures
Gail M. Ashley, Symposium Chairperson
Journal of Sedimentary Research (SEPM)
... forms are dunes. FIG. 9B. A log-log plot of wind ripples () and eolian dunes () and the calculated least squares regression line compared to regression...
1990
Evidence for a Tidally Influenced Upper Carboniferous Ombrogenous Mire System: Upper Bench, Beckley Bed (Westphalian A), Southern West Virginia
James R. Staub, Joan S. Esterle
Journal of Sedimentary Research (SEPM)
.... All logs were matched with adjacent logs using a visual "least squares" best fit method (Galloway 1972) to assess lateral variability due...
1992
Longshore Grain Sorting and Beach Placer Formation Adjacent to the Columbia River
Michael Zhenlin Li, Paul D. Komar
Journal of Sedimentary Research (SEPM)
..., differing only in the rate at which m decreases with the effective-density ratio (EDR). The empirical curve fitted by least-squares regression to our...
1992
Origin of Dolomite in the Phosphatic Miocene Hawthorn Group of Florida
John S. Compton , Donald L. Hall , David J. Mallinson , David A. Hodell
Journal of Sedimentary Research (SEPM)
... 0.003° 2 steps for 5 seconds per step to calculate the unit cell parameters a and c of dolomite by the least-squares cell refinement program LCLSQ...
1994
The Role of Magnesium in the Crystallization of Calcite and Aragonite in a Porous Medium
Lurdes Fernandez-Diaz , Andrew Putnis , Manuel Prieto , Christine V. Putnis
Journal of Sedimentary Research (SEPM)
... 508V Guinier viewer. The lattice parameters of the different samples were refined using between 12 and 22 reflections and a least-squares program CELL...
1996
Rb-Sr Ages of Diagenesis of Mg-rich Clay in Permian Sediments, Palo Duro Basin, Texas Panhandle, U.S.A.
Leon E. Long , Mark E. Erwin , , R. Stephen Fisher
Journal of Sedimentary Research (SEPM)
... of Economic Geology, Report of Investigations No. 147, 81 p. YORK, D., 1966, Least-squares fitting of a straight line: Canadian Journal of Physics, v...
1997
Crustal Structure and Rift-Drift Evolution of the Newfoundland Basin: Chapter 16: North American Margins
Brian E. Tucholke, James A. Austin Jr., Elazar Uchupi
AAPG Special Volumes
... = 1.56, K = 1.26 and t = one-way travel time in sec). V0 and K were determined by least-squares fit to MCS sediment interval velocities determined...
1989
Identifying the Controls Over Downstream Fining of River Gravels
Trevor B. Hoey, Brian J. Bluck
Journal of Sedimentary Research (SEPM)
.... The conversion equations obtained (Table 1) were obtained by ordinary least-squares log-log regression. Percentiles obtained from all 122 surface counts were...
1999
Responses of Stable Bay-Margin and Barrier-Island Systems to Holocene Sea-Level Highstands, Western Gulf of Mexico
Robert A. Morton , Jeffrey G. Paine , Michael D. Blum
Journal of Sedimentary Research (SEPM)
... is described by a least-squares polynomial regression of data points or the position of individual peat samples is taken as the best proxy for sea level...
2000