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The AAPG/Datapages Combined Publications Database
Showing 3,219 Results. Searched 200,636 documents.
3 Enhancing SEM Grayscale Images through Pseudocolor Conversion: Examples from Eagle Ford, Haynesville, and Marcellus Shales
Wayne K. Camp, Barry Wawak
AAPG Special Volumes
... surfaces. Deformed clay layers surrounding a spherical pyrite framboid are clearly observed in the grayscale image (Figure 5a). Figure 5. Secondary...
2013
Chamosite in the Recent Sediments of Loch Etive, Scotland
Vera Rohrlich , N. B. Price, S. E. Calvert
Journal of Sedimentary Research (SEPM)
...) contain approximately 50 percent by weight light gray to green, spherical to ovoid fecal pellets ranging in size from 50-200 microns. The remainder...
1969
Petrography of the Sirban Limestone of Riasi, Jammu Province, Jammu and Kashmir State
M. R. Sharma, S. P. Krishnaswami
Journal of Sedimentary Research (SEPM)
... in the carbonate rocks indicates: (1) calcite with 30 percent MgCO3 (Friedman, 1967) or about 12.7 percent MgO; (2) dolomite with 12 molecule percent excess...
1969
The "Sawdust Sand"--An Eocene Sediment of Floccule Origin
Wayne A. Pryor, William A. Vanwie
Journal of Sedimentary Research (SEPM)
..., and rate of interparticulate collision caused by turbulence. The floccules thus formed are roughly spherical in shape, of low density, with high water...
1971
Clay-Mineral Diagenesis Within Interlaminated Shales and Sandstones
David P. Bucke, Jr. , Charles J. Mankin
Journal of Sedimentary Research (SEPM)
.... In addition, a split portion of each sample was size-fractioned (equivalent spherical diameter) by settling techniques based upon Stokes' Law (Folk, 1965, p...
1971
Appendix A: Considerations for Optimum 3-D Survey Design, Acquisition and Processing
R. Malcolm Lansley
AAPG Special Volumes
... in excess of 2000 m, and for these water depths special processing techniques have been developed for managing the ghost effects. The source ghost...
2011
Downstream Changes in Shape in the Pebble Morphometry of the Tambo River, Eastern Victoria
Albert Goede
Journal of Sedimentary Research (SEPM)
... in excess of 1500 m. Flat land is limited to discontinuous stretches of floodplain and river terraces developed where the river passes through more erodible...
1975
Rate of Dissolution of Carbonate Sediments by Microboring Organisms, Davies Reef, Australia
Alexander W. Tudhope, Michael J. Risk
Journal of Sedimentary Research (SEPM)
... to and in excess of 5,000 m (Zeff 1977). Experimental work in modern environments has illustrated how swiftly and extensively substrates (chips of Iceland spar...
1985
Calcium Carbonate Production by Epibionts on Thalassia in Florida Bay
John E. Nelsen, Jr. , Robert N. Ginsburg
Journal of Sedimentary Research (SEPM)
.... Sed. Petrology, v. 45, p. 763-786. OPPENHIEMER, C. H., 1961, Note on the formation of spherical aragonite bodies in the presence of bacteria from...
1986
Traction-Carpet Stratification in Turbidites-Fact or Fiction?
Richard N. Hiscott
Journal of Sedimentary Research (SEPM)
... of large spherical particles between concentric cylinders: Journal of Fluid Mechanics, v. 127, p. 453-472. SAVAGE, S.B., AND SAYED, M., 1984, Stresses...
1994
Modified-grain-flow Deposits from the Upper Cretaceous Vallcarga Formation, South-Central Pyrenees, Spain
Jeroen D. Schuppers, Allard W. Martinius
Journal of Sedimentary Research (SEPM)
... include those in which a dense interstitial fluid, overlying current, or excess pore-fluid pressure aids significantly in maintaining the dispersion...
1994
Can Diagenetic Precipitation of Carbonate Nodules Affect Pore-Water Oxygen Isotope Ratios?
Stephen J. Burns
Journal of Sedimentary Research (SEPM)
... a spherical surface of radius a in time t, D is the sediment diffusion coefficient, Cb and Ca are the concentrations of the substance...
1998
Molar-Tooth Carbonates: Shallow Subtidal Facies of the Mid- to Late Proterozoic
Noel P. James, Guy M. Narbonne, Anne G. Sherman
Journal of Sedimentary Research (SEPM)
..., in excess of 50% of individual beds and 5-25% of entire formations, is further roughly equivalent to the amount of calcite in calcareous benthic...
1998
Carbonate Grain-Size Distribution in Hemipelagic Sediments from a Laser Particle Sizer: RESEARCH METHODS PAPERS
Alain Trentesaux, Philippe Recourt, Viviane Bout-Roumazeilles, Nicolas Tribovillard
Journal of Sedimentary Research (SEPM)
... of algorithms are then used to calculate a grain size distribution curve assuming a spherical shape of the particles. For these instruments, manufacturers...
2001
Authigenic Silicates in Marine Spencer Formation at Corvallis, Oregon
Harold E. Enlows , Keith F. Oles
AAPG Bulletin
...). The concretions generally are spherical and subordinately oblate, with surfaces ranging from smooth to pitted; the maximum diameter is 2.0 cm...
1966
Clay Microporosity in Reservoir Sandstones: An Application of Quantitative Electron Microscopy in Petrophysical Evaluation
Andrew Hurst , Paul H. Nadeau
AAPG Bulletin
... is defined as all particles with a mean spherical diameter (msd) of <2 µm. Clay minerals, however, commonly may be finer grained, for example msd <0.1 µm...
1995
Depositional and Burial Domain Influences on Microporosity Modalities in Carbonaceous Mudstones of the Upper Cretaceous Colorado Group, Western Canada Foreland Basin; #50802 (2013)
Peng Jianga and Burns A. Cheadle
Search and Discovery.com
... preservation of approximately spherical clay aggregate particles in a Lower Belle Fourche Alloformation sample from the eastern backbulge segment...
2013
A Comprehensive Quicklook Petrophysical Method to Log Analysis in Permian Basin Carbonates
George A. Anderson, III, George B. Asquith, Scott Frailey
West Texas Geological Society
.... These parameters also provide indications of excess conductivity in the reservoir that can occur in carbonates when microporous ooids and chert grains...
2002
Sediment Geochemistry of the Lower Jurassic Gordondale Member, Northeastern British Columbia
Daniel J. K. Ross, R. Marc Bustin
CSPG Bulletin
... weight percent). Excess SiO2 (i.e. silica which cannot be accounted for by the aluminosilicate phase) accounts for up to 94% of the SiO2 in the organic...
2006
Spatial Variability of Porosity in Chalk: Comparison of an Outcrop and a North Sea Reservoir
P. Frykman
AAPG Special Volumes
...- to Intermediate-scale VarianceThe model for the vertical semivariogram includes a spherical structure with range 0.20 m (0.66 ft), which accounts for 35...
2006
Morphology of Hydrocarbon Droplets During Migration: Visual Example from the Monterey Formation (Miocene), California
Neal R. O'Brien , Geoffrey D. Thyne , Roger M. Slatt
AAPG Bulletin
... pathways themselves. The small (5-10 µm) diameter droplets are observed to have various shapes that include spherical droplets, amalgamated droplets...
1996
Heavy Mineral Composition of the Cardium Formation, Pembina Oil Field
Martin Halpern
CSPG Bulletin
.... End_Page 311------------------------ Grains show conchoidal fracture and vitreous lustre. Spherical inclusions of probable solid matter (0.004...
1961
Improved Data Analysis and Interpretation Method for Laboratory Determination of Crushed-Sample Shale Gas Permeability
F. Civan, D. Devegowda, R. Sigal
Unconventional Resources Technology Conference (URTEC)
... formulation of Civan et al. (2012) is now extended for application to transport of gas in spherical-shape crushed rock samples. First, Eq.(3...
2013
Experimental Classification of Solid Carbonate Rocks on a Basis of Microscopic Organic Remains
I. V. Chubinidze
Petroleum Geology: A Digest of Russian Literature
... of planktonic foraminifera there are also radiolaria and spherical remains of probable organic origin; the latter could also be radiolaria. Upward...
1965
Armoured mud balls revisited
Lawrence H. Tanner
Atlantic Geology
..., on the north shore o f the Minas Basin. Shapes vary from nearly spherical to platy to elongate, with elongate predominant. The mud balls form from the action...
1996