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The AAPG/Datapages Combined Publications Database
Showing 440 Results. Searched 195,448 documents.
Evidence of Fluid Flow in Microfractures in Geopressured Shales
R. M. Capuano
AAPG Bulletin
... margins are a fine-grained matrix that is orange-yellow in plain light, and in polarized light has a second-order yellow birefringence. Most importantly...
1993
ABSTRACT: Converted Shear-Wave Anisotropy Attributes for Fractured-Reservoir Management; #90013 (2003)
JAMES E. GAISER, RICHARD R. VAN DOK
Search and Discovery.com
... Gaiser J.E., Loinger E., Lynn H. and Vetri L. 2001. PS-wave birefringence analysis at the Emilio field for fracture characterization. 63rd EAGE meeting...
2003
Multi-Component, Time-Lapse Seismology for Monitoring Reservoir Production Processes, by Robert D. Benson and Thomas L. Davis, Search and Discovery article #40075 (2003).
Search and Discovery.com
2003
Anhydrite-Gypsum Problem of Blaine Formation, Oklahoma
J. Lawrence Muir
AAPG Bulletin
... birefringence. The gypsum ranges in size from large irregular crystals to very small ones. This gypsum surrounds the anhydrite crystals, and is found also...
1934
Clay Minerals Of The Silurian Clinton Ironstones, New York State
Robert schoen
Journal of Sedimentary Research (SEPM)
... (Fig. 4). This mineral is length-slow and has low birefringence. Type 2 is clear to light-yellow sheaths alternating with hematite sheaths...
1964
Cherts with Moganite in Continental Mg-Clay Deposits: An Example of False Magadi-Type Cherts, Madrid Basin, Spain
M.A. Bustillo
Journal of Sedimentary Research (SEPM)
... spherules. Flakes similar to clay minerals are in places spread throughout the groundmass to give a general striated parallel birefringence (Fig. 4C...
2001
Paleopedology and Paleohydrology of a Volcaniclastic Paleosol Interval: Implications for Early Pleistocene Stratigraphy and Paleoclimate Record, Olduvai Gorge, Tanzania
Gail M. Ashley , Steven G. Driese
Journal of Sedimentary Research (SEPM)
..., and have extremely low birefringence (Fig. 6D-G). The root traces branch and bifurcate downward, decreasing in diameter at branch nodes. The most striking...
2000
Depositional Environment, Age, and Diagenesis of a Miocene Tuffaceous Limestone, La Honda Basin, Central California
D. El-Sabbagh, J.C. Ingle
Pacific Section of AAPG
... microstructure of barnacle plates (BRN). The two volcaniclastic grains (V) of basalt are partially altered to clays and chlorite (high birefringence colors...
1990
Tepees associated with mobility of evaporite sulfate: The case of the Irati Formation, Permian of Paraná Basin, Brazil
Setembrino Petri, Paulo César Fonseca Giannini, Artur Chahud, Isaac Jamil Sayeg
Journal of Sedimentary Research (SEPM)
..., low birefringence (first-order gray interference color) silt and sand, porosity variable according to stratification, elongated microfossils (bioclasts...
2022
Quartz Grain Orientations--1 (The Photometric Method)
R. F. Sippel
Journal of Sedimentary Research (SEPM)
..., and this complicates the computation of apparent birefringence. The situation is even more complicated if the optic axis is not in the plane of the figure...
1971
The Crescent Lake copper deposit, central Newfoundland: deep levels of a volcanogenic hydrothermal system?
Craig J. Waldie, E. Craig Jowett, H. Scott Swinden
Atlantic Geology
... a distinctive blue birefringence and higher Fe/Fe+Mg values (~ 0.51 vs. 0.42) than chlorite in barren host rock, similar to other VMS deposits. The average...
1991
Glacial dispersal of heavy minerals in late Wisconsinan till, central New Brunswick
E. R. C. Hornibrook, B. E. Broster, W. W. Gardiner, A. G. Pronk
Atlantic Geology
... microscopy (e.g., relief, colour, form, habit, birefringence and bireflectance, anisotropism, inter ference figures, a limited number of textural features...
1991
Sedimentological and geochemical characterization of microbial mats from Lagoa Vermelha (Rio de Janeiro, Brazil)
Caio Bittencourt Guedes, Michele Correia Arena, Hélisson Nascimento dos Santos, Bruno Valle, Jeferson de Andrade Santos, Julia Favoreto, Leonardo Borghi
Journal of Sedimentary Research (SEPM)
... polarizers), B) microncoids within a matrix with strong birefringence (white arrow) (crossed polarizers), C) overview of microncoids (yellow arrows...
2022
Mineralogy and Petrography of Marine Bottom Sediment Samples off the Coast of Peru and Chile
E-An Zen
Journal of Sedimentary Research (SEPM)
... of refraction and high birefringence. Many crystals appear to be skeletal and subhedral. The strong reflections at 24.3° 2 (relative intensity 50...
1959
Estimating the Oxygen Isotopic Composition of Equatorial Precipitation During the Mid-Cretaceous
Marina B. Suarez, Luis A. Gonzalez, Gregory A. Ludvigson
Journal of Sedimentary Research (SEPM)
... are described with respect to their birefringence fabric (b-fabric), which describes the pattern, orientation, and distribution of interference colors from...
2010
The Occurrence of Turquoise and Faustite in Tras, Pahang
K. N. Murthy
Geological Society of Malaysia (GSM)
.... In thin section the turquoise and faustite appears as sheaf-hke groups of crystals and have low birefringence (see Figs. 3,4 & 5) The petrographic...
1989
Seismic Shear Waves for Discriminating Lithology from Saturation Changes
T. L. Dobecki
Houston Geological Society Bulletin
.... Recent research developments in petroleum literature (Martin and Davis, 1987) have shown how fractured reservoirs impress a shear wave "birefringence...
1989
Zeolite-Opal Rocks from the Western Wichita Mountains, Oklahoma
Matt Hamilton
Oklahoma City Geological Society
... crystals display a faint birefringence with twinning (Fig. 2D). Calcite is present as isolated subhedral crystals within the matrix as well as near large...
2021
Effects of Depositional and Authigenic Clays on Porosity Development, Atoka Formation, White Oak Field, Arkoma Basin
C. Dianne Phillips, Doy L. Zachry
Tulsa Geological Society
... on sedimentary rock fragments; high birefringence suggests that illite is the primary clay mineral (Fig. 6). Cutans generally form in the B horizon of soils...
1996
Texas Fuller's Earths
M. N. Broughton
Journal of Sedimentary Research (SEPM)
... the Lauderdale pit, the Kenard pit, and the Simon pit also show crystalline clay minerals of high birefringence intermixed with partially altered fragments...
1932
Aid of Sedimentary Petrology to the Discovery of Oil
Raymond Sidwell
Journal of Sedimentary Research (SEPM)
... to pleochroism, refractive index, birefringence or interference figures, are important identification markers. Variation in pleochroism from the normal...
1943
Sediments From Pre-Cambrian Rocks of Southern Sangre De Cristo Mountains, New Mexico
Raymond Sidwell, John L. Haliburton
Journal of Sedimentary Research (SEPM)
... to the prism edge. The mineral is weakly pleochroic and because of the strong birefringence the color does not change under crossed nicols. Inclusions...
1948
Geology of Glauconite
E. Wayne Galliher
AAPG Bulletin
... or yellowish brown; the birefringence is high. When the biotite turns green, the average index of the slow ray drops to about 1.63, but that of the fast ray...
1935
Clay Minerals from the Ventura Basin, California
William Quaide
Journal of Sedimentary Research (SEPM)
... and birefringence estimations on coarse-grained material from the sandstones suggest that the mineral is penninite (Ny and Nz = 1.587 ± .003, Nx-Nz usually...
1957
Opal, Zeolites, and Clays in an Eocene Neritic Bar Sand: NOTES
E. G. Wermund, R. J. Moiola
Journal of Sedimentary Research (SEPM)
..., prismatic (blade-like to tabular) crystals up to .05 mm in length. They have an extremely low birefringence and rarely constitute more than one percent...
1966