Apatite Petrifactions in Pennsylvanian Shales of Illinois: NOTES

Harold J. Gluskoter, Louis H. Pierard, Hermann W. Pfefferkorn

Journal of Sedimentary Research (SEPM)

... section (transverse section) of damsite petrifaction. End_Page 1364----------------------- study of the sample. The birefringence of the apatite...

Diagenesis of the Upper Proterozoic Siliciclastic Sediments of the Taoudeni Basin (West Africa) and Relation to Diabase Emplacement

Jean-Pierre Girard , Max Deynoux, Daniel Nahon

Journal of Sedimentary Research (SEPM)

... properties (loss of pleochroism, lowering of the birefringence, fading and distortion of cleavages) and in composition (loss of K and Na and FIG. 3...

Crystal Growth Diagrams as an Aid to Interpreting the Fabrics of Calcite Aggregates

J.A.D. Dickson

Journal of Sedimentary Research (SEPM)

... which extends radial structure of ooids. Birefringence, first order grey; section 1 to 2 µm thick. Note good definition of fabric. End_Page 9...

Diagenesis of the Frontier Formation, Moxa Arch: A Function of Sandstone Geometry, Texture and Composition, and Fluid Flux: Part 3. Applications in Exploration and Production

Sharon A. Stonecipher, Robert D. Winn Jr., Michele G. Bishop

AAPG Special Volumes

... pore in lower shoreface sandstone. Note characteristic speckled yellowish-brown birefringence of the I/S MLC. (a) plane polarized light; (b) crossed...

Spherulites in Calcrete Laminar Crusts: Biogenic CACO3 Precipitation as a Major Contributor to Crust Formation

Eric P. Verrecchia , Pierre Freytet , Karin E. Verrecchia, Jean-Louis Dumont

Journal of Sedimentary Research (SEPM)

... one center, Type D in Figure 3) in a laminar crust (same area as A). Fibro-radial fabric is well developed, and the birefringence varies along the same...

Converted Shear-Wave Anisotropy: New Technology for Fractured-Reservoir Management; #90017 (2003)

James Gaiser, Richard Van Dok

Search and Discovery.com

... H. and Vetri L. 2001. PS-wave birefringence analysis at the Emilio field for fracture characterization. 63rd EAGE meeting, Amsterdam, Extended...

Fracture Identification with Seismic Data, XinChang Field, China, by Peter Stewart, John Tinnin, James Hallin, and Jim Granath, #40370 (2008).

Search and Discovery.com

Role of Clay Diagenesis in Hydrocarbon Accumulation in Shale Reservoirs of Sanand Field, Cambay Basin, Gujarat, India: A Case Study; #20085 (2010)

Kamal K. Das, Bharti Jagtap, J. K. Srivastava, Sanjiv Satyarthi, Neelam Niranjan

Search and Discovery.com

... birefringence and also by using X-ray diffraction and SEM. The kaolinite occurs as very fine to fine grained floating grains in argillaceous and partially...

Elastic Anisotropy of Shales ƒ Revisited; #41557 (2015)

Marina Pervukhina, Patrick N. J. Rasolofosaon

Search and Discovery.com

... polarized S‐wave). The parameter  happens to be also equal to the S‐wave birefringence coefficient for propagation in the horizontal direction. More...

Compressional and Shear Wave Seismic Studies in the Williston Basin of Central Saskatchewan

Bradley J. Carr, Zoltan Hajnal

Williston Basin Symposium

..., or thin layers. Shear wave birefringence is seismically detectable as a partition of shear wave energy, a time delay between identical...

Submarine Volcanic Mudflows and Limestone Dikes in the Grayson Formation (Cretaceous) of Central Texas

Robert Greenwood

GCAGS Transactions

.... The specific gravity is 3.1. In thin section the olivine is partly altered to a fibrous golden brown mineral of rather high birefringence, probably...

Application of Outcrop Information to Subsurface Exploration for Sandstone Reservoirs; Basal Belly River Formation (Upper Cretaceous), Alberta Foothills

C. J. Iwuagwu, J. F. Lerbekmo

CSPG Special Publications

... as A, but between crossed polarizers. The calcite cement (c) stands out because of its bright birefringence. C.) General texture of stream mouth bar...

Characterisation of the Weathering Profile Developed over an Amphibole Schist Bedrock in Peninsular Malaysia

J. K. Raj

Geological Society of Malaysia (GSM)

... grained and showing weaker birefringence), though still relatively less altered than the zoisite and clinozoisite. Further alteration of these minerals...

Fracture Definition by Surface Seismic at the Bluebell-Altamont Field, Uinta Basin, Utah

Norman Harthill, C. Richard Bates, Heloise B. Lynn, K. Michelle Simon

Rocky Mountain Association of Geologists

.... In fractured rock, a shear wave undergoes a phenomenon known as birefringence (splitting) where the wave splits into components polarized parallel...

Distribution, Depositional Environment, and Reservoir Properties of the Pennsylvanian Tonkawa Sandstone in South Peek Field, Ellis and Roger Mills Counties, Oklahoma, (Part 2)

Christopher L. Wiggers

Oklahoma City Geological Society

... was identified by its high birefringence, and ranges from 2 to 10 percent of the rock volume (Fig. 19). Muscovite exhibits signs of extreme compaction...

Inverse Graded Bedding in Primary Gypsum of Chemical Deposition

L. Ogniben

Journal of Sedimentary Research (SEPM)

... glauconite in sizes up to 0.05 mm, and lamellae of brown clay minerals of medium birefringence or of greenish chloritic minerals of very low...

Mineral Alteration In Rocks Of Middle Eocene Age, Absaroka Range, Wyoming

Richard L. Hay

Journal of Sedimentary Research (SEPM)

... a shredded appearance (fig. 2d). Most of the shredded biotite is unusually green and has abnormally low birefringence, due most likely to chloritic alteration...

Methylene Blue Adsorption by Fine Grained Sediments

Roy K. Taylor

Journal of Sedimentary Research (SEPM)

... matrix. Most of the mica in the samples is degraded with a birefringence as low as 0.015, but even in the marine shales, ribbons, laths, and plates...

Re-evaluation of the Use of Undulatory Extinction and Polycrystallinity in Detrital Quartz for Provenance Interpretation

Abhijit Basu, Steven W. Young, Lee J. Suttner, W. Calvin James, Greg H. Mack

Journal of Sedimentary Research (SEPM)

... explanation of figure is in text. End_Page 876------------------------ birefringence and thus having highly inclined optic planes. Summary Results...

Alteration of Sandstone as Revealed by Spheroidal Weathering

M. T. Heald, T. J. Hollingsworth, R. M. Smith

Journal of Sedimentary Research (SEPM)

... dissolution of the siderite but much of it was replaced by iron oxyhydroxides. Biotite underwent a decrease in pleochroism and birefringence and an increase...

Infiltrated Clays in Fluvial Jurassic Sandstones of Reconcavo Basin, Northeastern Brazil

Marco A. S. Moraes , Luiz F. De Ros

Journal of Sedimentary Research (SEPM)

... increase in the birefringence of the aggregates. Locally, these processes produce a rearrangement of the crystals to a crystallographic position different...

Authigenic Silicates in Marine Spencer Formation at Corvallis, Oregon

Harold E. Enlows , Keith F. Oles

AAPG Bulletin

... sections the slow ray parallel the long diagonal Birefringence moderate, commonly masked by the enclosing thomsonite Physical separation of actinolite from...

Chapter 4: New Evidence for Putumayo Crust in the Basement of the Falcon Basin and Guajira Peninsula, Northwestern Venezuela

Marvin Baquero, Sebastian Grande, Franco Urbani, Umberto Cordani, Chris Hall, Richard Armstrong

AAPG Special Volumes

... preserved it has a weak greenish hue, and it is easy to be mistaken with other low birefringence species, except for its higher relief and alteration...

Authigenic Clays in Sandstones: Recognition and Influence on Reservoir Properties and Paleoenvironmental Analysis

Michael D. Wilson, Edward D. Pittman

Journal of Sedimentary Research (SEPM)

... commonly abuts a detrital clay lamina of distinctly different optical character (color, birefringence). Authigenic and allogenic assemblages differ...

MINERALOGY AND DIAGENESIS OF LOW-PERMEABILITY SANDSTONES OF LATE CRETACEOUS AGE, PICEANCE CREEK BASIN, NORTHWESTERN COLORADO

Paula L. Hansley, Ronald C. Johnson

Rocky Mountain Association of Geologists

... of refraction, twinning, birefringence, and morphology. Indices of refraction were determined by examination of grain mounts in immersion oils. The lower...