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The AAPG/Datapages Combined Publications Database
Showing 3,221 Results. Searched 201,044 documents.
Effect of Surface Conductance on Drilling-Mud Resistivity: GEOLOGICAL NOTES
Norman Street
AAPG Bulletin
... be strictly true for a dilute suspension of spherical particles, for a concentrated suspension of spheres a more complicated relationship has been...
1956
Abstract: Microbialites in Zechstein Cycle 2 Carbonates (NE England and Poland): Types and Source Rock Perspectives; #90153 (2012)
Mirosław Słowakiewicz and Maurice E. Tucker
Search and Discovery.com
... that appear peaked or rounded in cross-section. They display the same relative orientation and are believed to have originated as wave-generated...
2012
The Structure and Diagenesis of Rhizoliths from Cayman Brac, British West Indies
Brian Jones, Kwok-Choi Ng
Journal of Sedimentary Research (SEPM)
...) isolated calcite rhombs, 3) calcified spherical bodies, 4) Types I and II calcified epilithic and chasmolithic filaments, and 5) grain-coating...
1988
An Automated Grain-shape Classifier
William H. Glezen, John C. Ludwick
Journal of Sedimentary Research (SEPM)
... coarse sand grains into three shape classes: spherical, intermediate, and tabular. Six samples of 1500 grains each can be classified in 2.5 hours...
1963
Sphericity Determinations of Pebbles and Sand Grains
Willard D. Pye, Margaret Hurst Pye
Journal of Sedimentary Research (SEPM)
... and sand grains is simply and rapidly determined by taking ratios of the diameters of the particles. It is proved that for ellipsoidal and spherical shaped...
1943
Heterogeneous Distribution of Calcite Cement at the Outcrop Scale in Tertiary Sandstones, Northern Apennines, Italy
Earle F. McBride , Kitty L. Milliken , William Cavazza , Ubaldo Cibin , Daniela Fontana , M. Dane Picard , Gian Gaspare Zuffa
AAPG Bulletin
... localized hydrologic factors in determining the spatial distribution of authigenic pore-filling calcite. Spherical concretions grew by diffusive supply...
1995
Enhanced Two Dimensional Grain Size Analysis through the Use of Calibrated Digital Petrography, #41461 (2014).
O. Hinds, R.A. Duller, R.P. Walker, B.T. Wells, R.H. Worden
Search and Discovery.com
... the effect of size distribution and shape variation error. Three samples were made from: sample a; unimodal glass beads with spherical shape (Figure 1a...
2014
Understanding Organic Matter Structural Changes with Increasing Thermal Maturity from Oil Shale Plays through SEM Imaging
Leo Alcantar-Lopez
Unconventional Resources Technology Conference (URTEC)
... when compared to the AR shale samples. The OM nanoparticles observed from the lower end of maturity spectrum (~0.9 %Ro eq.) were spherical...
2016
Determination of Drag Coefficients in Measuring Particle Diameters
Weinan Chen
Journal of Sedimentary Research (SEPM)
... for estimating the contact area between a particle and the fluid, which is critical in calculating the nondimensional drag coefficient (CD). When a spherical...
2003
Cave Pearls and Pisoliths: A Sedimentological Comparison
Carol A. Hill
West Texas Geological Society
... Cave, Guadalupe Mountains, New Mexico (Nymeyer, 1938). Shape is typically spheroidal for both pisoliths and cave pearls, but can vary from spherical...
1992
Practical Significance of Birdseye Structures in Carbonate Rocks
E. A. Shinn
Journal of Sedimentary Research (SEPM)
.... Birdseye vugs, shown in figure 7, formed both under the heat lamp and outdoors under the sun. Both spherical and planar types, similar to those described...
1968
Estimation of In-Situ Wettability using Multi-Frequency Electromagnetic Measurements
Yuteng Jin, Siddharth Misra, Dean Homan
Unconventional Resources Technology Conference (URTEC)
... and nonconductive phase on the surface of a spherical particle. The wetting phase will try to surround the solid particle to satisfy the contact angle...
2020
Volcanic effects on microplankton during the Permian Triassic Transition (Shangsi and Xinmin, South China)
Jun Shen, Yong Lei, Thomas J. Algeo, Qinglai Feng, Thomas Servais, Jianxin Yu, Lian Zhou
PALAIOS
... but acritarchs reached their peak abundance, confirming their role as a disaster taxon. Above the LPME, long-spined and small spherical acritarchs...
2013
The Influence of Plants and Micro-Organisms on Diagenesis in Caliche: Example from the Pleistocene Ironshore Formation on Cayman Brac, British West Indies
Brian Jones
CSPG Bulletin
... and spherical bodies ((Fig. 7D-F)), and (4) calcified hemispherical and spherical bodies ((Fig. 7A-C)). UNCALCIFIED FILAMENTS The uncalcified filaments...
1988
Scanning Electron Microscope Petrographic Differentiation among Different Types of Pores Associated with Organic Matter in Mudrocks
Robert M. Reed, Robert G. Loucks, Lucy T. Ko
GCAGS Journal
...., 2016, 2017; Reed et al., 2019). Hundreds of samples have been prepared using Ar– ion milling for examination in the SEM. Samples include a broad...
2020
Recognition of Sandstone Depositional Environment: A Grain Shape Approach, with an Example from North Padre Island
Jim Mazzullo , Donald Sims
GCAGS Transactions
... that spherical sand grains have a strong tendency to move under the influence of the wind, while less spherical grains tend to lag behind. Mattox (1955), however...
1983
Marcasite in Black Shales—a Mineral Proxy for Oxygenated Bottom Waters and Intermittent Oxidation of Carbonaceous Muds
Juergen Schieber
Journal of Sedimentary Research (SEPM)
... and is closely associated with irregular patches of pyrite microcrysts and remnant spherical shapes consisting of pyrite microcrysts (Fig. 2A). Features...
2011
Early Diagenetic Silica Deposition in Algal Cysts and Spores: A Source of Sand in Black Shales?
Jurgen Schieber
Journal of Sedimentary Research (SEPM)
... of compaction, a small proportion are filled with diagenetic silica. The latter are spherical to ellipsoidal (0.1-0.5 mm), and filled with chalcedony, microquartz...
1996
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
Chamosite Oolites in the Devonian of Pennsylvania
Richard A. Sheppard, Ralph E. Hunter
Journal of Sedimentary Research (SEPM)
... as oolites by their nuclei and concentric structure and by their spherical form where protected from flattening after deposition. Broken oolites serving...
1960