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The AAPG/Datapages Combined Publications Database
Showing 3,221 Results. Searched 201,049 documents.
Pisolites Formed from the Oilfield Water of the Luling Field, Caldwell County, Texas
Augusta Hasslock Kemp
Journal of Sedimentary Research (SEPM)
... agitated pools on the floor below.< P> The pisolites ranged from 3 mm to 50 mm in diameter, and their shapes ranged from spherical to ovoid...
1959
A Peculiar Pedestalate Terrace, San Nicolas Island, California: NOTES
Harold D. Palmer , David W. Scholl , Jack Green
Journal of Sedimentary Research (SEPM)
... to moderately well sorted medium grained arkosic sandstone [in which] large elongate to nearly spherical calcareous concretions ... occur in some...
1965
A Rapid Method for Determining Weight Percentages of Unsieved Heavy Minerals
Ralph E. Hunter
Journal of Sedimentary Research (SEPM)
...) for spherical grains of a given density () is easily calculated by the formula: grain weight=d3/6. Natural sand grains, however, are usually not spherical...
1967
Glossary
Joann E. Welton
AAPG Special Volumes
...-sea oozes of the temperate and tropical oceans, and were probably not common before the Jurassic. coccosphere: The entire spherical or spheroidal...
1984
Abstracts: An Investigation of Systematic Location Errors of Microseismic Events; #90173 (2015)
Martin E. Nicola, Bernd Milkereit, and Emmanuel Bongajum
Search and Discovery.com
... from wave fields in heterogeneous and homogeneous media. Borehole logs from Sudbury, have been used in a ray algorithm to produce travel time values...
2015
Abstracts: Influence of Hydrothermal Fluids on the Horn River Shale Sequence; #90173 (2015)
Ronald J. Spencer, Thomas Weedmark, Victoria Biersteker, and Jon Dola
Search and Discovery.com
... tests are nearly spherical in the silica cemented and dolomite cemented examples in Figure 3 (left and right), but flattened in the uncemented example...
2015
Analysis of the Relations between Porosity and Permeability in Non-Consolidated Granular Media, #40970 (2012)
Melia Da Silva, Carlos Santos
Search and Discovery.com
... studied, and three relations were proposed after analyzing the 2D distribution of the pore throat radii in monodisperse and spherical granular samples...
2012
Diagenetic and Compositional Controls of Wettability in Siliceous Sedimentary Rocks, Monterey Formation, California; #51111 (2015)
Kristina M. Hill and Richard J. Behl
Search and Discovery.com
... (spherical droplets, left) and quartz (low dome droplets, right) in sandstone, showing contrasting wetting characteristics of different mineral surfaces (image...
2015
Unsteady-state diffusion modeling of gas in coal matrix for horizontal well production
Jian-Chun Guo, Ren-Shi Nie, and Yong-Lu Jia
AAPG Bulletin
... assumptions were adopted, such as the spherical matrix elements (Ertekin and Sung, 1989; Anbarci and Ertekin, 1990, 1991) and uniform entry into the well...
2014
Passageways for permeability: Geostatistical simulation of controls on the connectivity of vug-to-vug pore networks
Hassan A. Eltom, Eugene C. Rankey, Robert H. Goldstein, and Reza Barati
AAPG Bulletin
... mathematical relationships that predict the probability (P) of high permeabilities from connected passageways of vugs, given known vug shape (Ar), size (Si...
2023
Size Analysis of Sand by a Sedimentation Technique
David M. Poole
Journal of Sedimentary Research (SEPM)
... experimentally (among others, Heywood, 1938; U. S. Engineers 1941, 1943) for single spherical grains. The use of single spheres in these experiments obviously...
1957
Determination of Average Grain Sphericity in Granular Porous Media
Basanta K. Sahu
Journal of Sedimentary Research (SEPM)
... surface of the natural porous media as well as of specific spherical surface per unit solid volume if the natural irregular grains are replaced...
1974
Experimental Hydrothermal Alteration of Tholeiitic Basalt: Resultant Mineralogy and Textures
J. B. Keene, David A. Clague , Richard K. Nishimori
Journal of Sedimentary Research (SEPM)
... to that occurring in hydrothermal experiments (Fig. 3). Scale bar = 10 µm. 11. Alteration of glass fragments forms clays and spherical fragments. Similar...
1976
Gypsum-Oolite Dunes, Great Salt Lake Desert, Utah
Daniel J. Jones
AAPG Bulletin
... velocity, and the layers of algal limestone fragments may represent intervals of vigorous wave action along the lake shore on the west. The average...
1953
Origin of Oolitic Iron Formations: REPLY
Michael M. Kimberley
Journal of Sedimentary Research (SEPM)
..., p. 157), "If a wave-rippled sandstone or oolitic limestone is overlain by fully marine shales ... there will be little dispute that the latter were...
1980
Settling Velocities of Irregular Grains at Low Reynolds Numbers
Jumpei Baba, Paul D. Komar
Journal of Sedimentary Research (SEPM)
... is that the regu ar, symmetric non-spherical grains have greater reduction in settling velocities from spheres than do the irregular, non-spherical grains...
1981
Ventura Basin Edge Environment: GEOLOGICAL NOTES
Herbert Skolnick , Robert E. Arnal
AAPG Bulletin
... yellow, highly metallic octahedra in irregular and spherical aggregates; very thin coal streaks throughout matrix; very rare "carbonaceous" films; rare...
1959
The Rounding of Sand Grains
W. H. Twenhofel
Journal of Sedimentary Research (SEPM)
... and on beaches and eolian transportation in any environment. It is concluded that stream traction transportation does not favor rounding of sand grains, that wave...
1945
Mineralogy and Petrology of the Cretaceous-Tertiary Boundary Clay Bed and Adjacent Clay-Rich Rocks, Raton Basin, New Mexico and Colorado
Richard M. Pollastro, Charles L. Pillmore
Journal of Sedimentary Research (SEPM)
... in the boundary bed was probably rapid, leading to hydrated, disordered, fine-grained clay minerals that formed into curled spherical or tubular shapes...
1987
Cross-Shore Distribution of Sediment Texture Under Breaking Waves Along Low-Wave-Energy Coasts
Ping Wang , Richard A. Davis, Jr. , Nicholas C. Kraus
Journal of Sedimentary Research (SEPM)
...Cross-Shore Distribution of Sediment Texture Under Breaking Waves Along Low-Wave-Energy Coasts Ping Wang , Richard A. Davis, Jr. , Nicholas C. Kraus...
1998
Structural Model of Large Part of the Earth
Wallis S. Hamilton
AAPG Bulletin
... that concerns us was composed of spherical layers. Then, during its history, unknown movements of the interior boundaries of the region caused...
1962
On the Origin and Significance of Pyrite Spheres in Devonian Black Shales of North America
Jurgen Schieber , Gordon Baird
Journal of Sedimentary Research (SEPM)
... crystalline pyrite, framboids, concretions, and sand-size pyritic spheres. The latter, unusual because of their spherical shape and large size, were...
2001
Effects of SEM Preparation Techniques on the Appearance of Bacteria and Biofilms in the Carter Sandstone
Sarah E. Fratesi, F. Leo Lynch, Brenda L. Kirkland, Lewis R. Brown
Journal of Sedimentary Research (SEPM)
... of the biofilm by washing away this smooth outer layer. Small (50–200 nm) spherical structures are present in all samples but are particularly...
2004
A Textural Inversion Phenomenon Within Lower Jurassic Red Beds of the Ardon Formation, Makhtesh Ramon, (Israel)
Ron Goldbery
Journal of Sedimentary Research (SEPM)
... spherical, well rounded very well-sorted, coarse quartz grains, dispersed within an argillaceous silty micrite. The former is indicative of high energy...
1979
Irregular Fenestrae in Bahamian Eolianites: A Rainstorm-Induced Origin
Roger J. Bain , Pascal Kindler
Journal of Sedimentary Research (SEPM)
... discontinuous zones restricted to the nearly horizontal lower part and toe of eolian foresets (Fig. 3A). These voids are spherical to elongate and are up to 2...
1994