Recent Calcareous Stromatolites from Laguna Mormona (Baja California) Mexico

Robert J. Horodyski, Stephen P. Vonder Haar

Journal of Sedimentary Research (SEPM)

...--from a few cells enclose within a spherical sheath to hundreds of cells forming attached mammillate colonies. These colonies, occurring in the organic...

ANOXIC SULPHIDIC DIAGENESIS IN THE ORDOVICIAN WINNIPEG FORMATION OF SASKATCHEWAN

PIER L. BINDA

Williston Basin Symposium

... in excess of 100 m in North Dakota and onlaps the Canadian Shield at about 54°30' Lat. N. Most of the formation is concealed beneath younger rocks...

Experimental Ooids and Grapestones: Carbonate Aggregates and Their Origin

John C. Deelman

Journal of Sedimentary Research (SEPM)

...: J. Geology, v. 68, p. 481-497. OPPENHEIMER, C. H., 1961, Note on the formation of spherical aragonitic bodies in the presence of bacteria from...

The preservation of water-table caves at depth: Observations from subsurface data and numerical modeling

Andrea Nolting, P. J. Moore, Janelle Homburg, and Fermín Fernández-Ibáñez

AAPG Bulletin

... caves can form abruptly (i.e., <10,000 yr) and can reach sizes in excess of 15,000 m3 (Mylroie and Carew, 1995; Lascu, 2005). Field observations from...

A Dynamic Reserve Estimation Method for Both Methane and Water in Coal Reservoirs; #42250 (2018)

Quanshu Zeng, Zhiming Wang, Hansen Sun

Search and Discovery.com

... Carbon Atom Coalbed Methane Fields, CHINA Density Profile Excess Adsorption Coal samples used for adsorption capacity assessment PT BWBC Coal...

A Quantitative Study of Compaction with Depth in a Vesicular Sand Layer in an Intertidal Area of Dublin Bay, Ireland

Colin R. Harris

Journal of Sedimentary Research (SEPM)

... estimation chart and a division between vesicles and non-vesicles (channel-pores) made. The vesicles were divided by the chart into spherical, ellipsoidal...

A Coupled Pore-Scale Modelling Approach to Capture Macro-Scale Stress-Dependent Permeability of Rocks

Keivan Khaleghi, Stephen Talman, Alireza Rangriz Shokri, Bauyrzhan K. Primkulov, Abel S. Juncal, Rick J. Chalaturnyk

Unconventional Resources Technology Conference (URTEC)

... of a reservoir on the pore space deformation and absolute permeability of rocks formed by spherical grains. Comparable to commonly used thin sections...

Mineral, Chemical, and Textural Relationships Chalk of the Niobrara Formation, Denver Basin, Colorado

Richard M. Pollastro, Carl J. Martinez

Rocky Mountain Association of Geologists

... (Lockridge and Scholle, 1978). Although the chalk reservoirs of the Niobrara have permeabilities in excess of 0.5 md at shallow depths, faulting...

Microfractures Due to Overpressures Caused by Thermal Cracking in Well-Sealed Upper Devonian Reservoirs, Deep Alberta Basin

Xiomara M. Marquez , Eric W. Mountjoy

AAPG Bulletin

... from depths in excess of 4000 m in this area (Hriskevich et al., 1980). The reservoir is an isolated carbonate buildup 11 × 4 km in area and 274 m thick...

Tensile radiation from slip in a medium with rough fractures

Scott Leaney, Chris Chapman

International Meeting for Applied Geoscience and Energy (IMAGE)

... wherein texture or roughness is added to the fracture via coupled excess compliances. This reasonable extension of a purely planar fracture model leads...

Petrophysical Interpretation of Multi-Frequency Electromagnetic Measurements in Clay- and Conductive-Mineral-Rich Mudrocks

Siddharth Misra, Yifu Han

Unconventional Resources Technology Conference (URTEC)

... conductivity (σeff) and dielectric relative permeability (εr,eff) of geomaterials containing uniformly distributed conductive spherical, rod-like...

Flocculation Behavior of Suspended Sediments and Oil Emulsions

N. Jay Bassin , Takashi Ichiye

Journal of Sedimentary Research (SEPM)

... equivalent spherical diameter of about 1 µm. The sediment was thoroughly cleaned of organic matter by repeated washings in hydrogen peroxide. While...

Supratidal Carbonate Rocks in the Black River (Middle Ordovician) Group of Southwestern Ontario, Canada

Kalyan Kumar Mukherji

Journal of Sedimentary Research (SEPM)

... limits of Unit II but occasional association of similar features can also be observed in the beds of underlying Unit I. The pebbles are spherical...

Assessing the Relative Importance of Compaction Processes and Cementation to Reduction of Porosity in Sandstones

David W. Houseknecht

AAPG Bulletin

... that, in a sand composed of nonductile grains that are fairly spherical and well rounded, intergranular volume potentially can be reduced to 26% (approximate...

Traveltime Computations for Locating the Source of Micro Seismic Events and for Forming Gridded Traveltime Maps

John C. Bancroft

Search and Discovery.com

... of an event, based on the assumption that the event creates a spherical wavefront which is recorded by a number of receivers with fixed locations. This method...

Traveltime Computations for Locating the Source of Micro Seismic Events and for Forming Gridded Traveltime Maps

John C. Bancroft

Search and Discovery.com

... of an event, based on the assumption that the event creates a spherical wavefront which is recorded by a number of receivers with fixed locations. This method...

ABSTRACT: Spatially Varying Characteristics in Mineralogy in Deepwater Lobe Deposits: Examples from Outcrop, Experimental, and Subsurface Studies, by Stammer, Jane; Pyles, David ; Straub, Kyle M.; Sullivan, Morgan D.; #90142 (2012)

Search and Discovery.com

Abstract: Microbial Biomineralization Processes of Stromatolitic Dolostone from the Ediacaran Period in Sichuan Basin, Southeast China;

Jie Zhang

Search and Discovery.com

... the microstructure of stromatolitic dolostone and found abundant spherical, oval-like dolomites, the size of which are 5-15 microns. The Mg/Ca ratios...

Abstract: Depositional Setting and Paragenesis of Silica Nodules from the Middle Jurassic Curtis Formation on the Eastern Flank of the San Rafael Swell, Central Utah; #91201 (2022)

Eric Stautberg, Marsha French, and Mindy Solomon

Search and Discovery.com

... sinters ceased. In thin section, silica nodules in these beds exhibit two distinctive botryoidal morphologies: 1) a spherical crystal with radial...

Factors Involved in Segregation of Oil and Gas from Subterranean Water

Jan Versluys

AAPG Bulletin

... to compaction of the strata and rise of temperature with depth, there is a constant excess of water at depth, and this water tends to rise through the overlying...

Stable Isotopes of Sulfur, Nitrogen and Deuterium in Recent Marine Environments

I. R. Kaplan

Special Publications of SEPM

.... t three methods. reaction verified by several workers is that of acid-volatile sulfide with excess solid elemental sulfur (Feld, 1911; Roberts 1969...

Euxinic Early Permian Sedimentation in the Cassia Basin of Southern Idaho

William A. Morgan

Rocky Mountain Section (SEPM)

... mostly of lime mud, with minor amounts of spherical microfossils and randomly distributed quartz silt. Thin section, plane light. UW 1664/15. (B...

Distorted Oolites and Pseudoolites

Albert V. Carozzi

Journal of Sedimentary Research (SEPM)

..., No. 21, p. 363-379. End_of_Record - Last_Page 274------- In this paper an oolite is defined as a spherical or subspherical body, 0.25 to 2 mm...

Mechanical Analysis

Stina Gripenberg

Special Publications of SEPM

... be achieved by saturation with highly hydrated ions and subsequent removal of excess electrolyte. Dispersion methods are of five different kinds: (i...

Mechanical Analysis: Part 7. Methods of Study

Stina Gripenberg

AAPG Special Volumes

... best be achieved by saturation with highly hydrated ions and subsequent removal of excess electrolyte. Dispersion methods are of five different kinds...