Petrology of Entrada Sandstone (Jurassic), Northeastern Utah

E.P. Otto, M. Dane Picard

Rocky Mountain Association of Geologists

... in the sandstone facies exhibit an average porosity of 15.9 percent and offer the best potential as reservoir rocks. Where eolian beds are close...

Section One: Development of Diapirs and Diapiric Structures

New Orleans Geological Society

... erratic. These diapirs may be in a "normal" depth distribution. Of 226 salt diapirs under onshore South Louisiana, about 21 percent are penetrants...

The Barnett Shale in southeastern New Mexico: Distribution, thickness and source rock characterization

Ronald F. Broadhead

West Texas Geological Society

... ranges from 0.85 to 4.9 percent. The kerogen population is dominantly gas prone. The Barnett Shale is thermally mature throughout its extent in the New...

Uranium-Vanadium Deposits of the Henry Mountains, Utah

William L. Chenoweth

Utah Geological Association

... produced 79,500 tons of ore with an average grade of 0.30 percent U3O8 and containing 474,500 pounds of uranium oxide (U3O8). In addition, vanadium has...

Notes on Diagenetic Dolomitization

Harold J. Bissell, George V. Chilingar

Journal of Sedimentary Research (SEPM)

... content of 75 percent, undergoes complete reduction, it will give rise to 0.26 percent sulfur which can form pyrite with available iron. Thus, the amount...

Geology of Bottom Sediments from Burt Lake, Cheboygan County, Michigan

John R. Reid

Journal of Sedimentary Research (SEPM)

..., with the gelatinous silts of the central trough containing an average of 45.5 percent equivalent calcium carbonate and 27.8 percent organic carbon...

Interpretative Value of Heavy Minerals from Bentonites

Charles E. Weaver

Journal of Sedimentary Research (SEPM)

... percent, but may contain as much as 90 percent, illite layers. If weathering is sufficiently intense, volcanic material or montmorillonite may alter...

Determination of Carbonate and Organic Matter in Calcareous Sediments and Sedimentary Rocks by Loss on Ignition: Comparison With Other Methods

Walter E. Dean, Jr.

Journal of Sedimentary Research (SEPM)

.... The weight loss of the sample can be determined by weighing the sample before and after ignition and determining the weight percent loss by difference...

The Relationship Between Carbonate Mineralogy and Grain Size in Two Alpine Lakes

Stephen K. Kennedy, Norman D. Smith

Journal of Sedimentary Research (SEPM)

... and total calcite increases with decreasing grain size. Results of observed mineral distributions, saturometry experiments, and percent saturation...

Natural Fractures, Composition, Cyclicity, and Diagenesis of the Upper Cretaceous Niobrara Formation, Berthoud Field, Colorado

Richard M. Pollastro

Rocky Mountain Association of Geologists

... mineralogies. The Smoky Hill Chalk Member contains mostly impure chalks averaging about 30 weight (wt.) percent insoluble residue; purer chalks having up...

Geochemistry of Coal from the Ditch Creek Siltstone Member of the Hornbrook Formation, Northern California

Jan L. Zigler, Tor H. Nilsen

Pacific Section SEPM

... taken from mining tailings indicate a coal ash content of 28 percent and a coal density (dry-basis) of 1.40 g/cm^. Maceral analysis indicates a rank...

Mineral Resources of the Milford Area, Beaver County, Utah

James A. Whelan

Utah Geological Association

... porphyry copper. Until recently, it was worked by Essex International, Incorporated. Grade during the recent mining was about one percent. Early...

A Method for Determining the Randomness of Regionally Distributed Quantitative Geologic Data

R. A. Cadigan

Journal of Sedimentary Research (SEPM)

... at least 20 percent of the time. The differences which produced the 0.50 to 0.20 probability would not be considered significant, and the relatively high...

Radiocarbon Dating of Size Fractions of a Sample of Bahama Carbonate Sediment

Keith A. Kvenvolden

Journal of Sedimentary Research (SEPM)

... determined by pipette methods (Krumbein and Pett john, 1938, p. 166). The sample contained 7 percent sand sizes (>62µ), 61 percent silt sizes (62-4...

Dolomite-Insoluble Residue Relationships in the Ten Mile Creek Dolomite (Middle Devonian) Near Toledo, Ohio: NOTES

Craig B. Hatfield, Timothy J. Rohrbacker

Journal of Sedimentary Research (SEPM)

... ratios with percent insoluble residue, percent clay minerals, identity of clay minerals, or percent silica. This roughly parallels results reported...

Mineralogy of an Upper Cambrian K-Bentonite from Missouri: NOTES

Arthur O. Beall, Jr., Richard W. Ojakangas

Journal of Sedimentary Research (SEPM)

... than 300 grains were made in each sample. Forty-three percent of the non-opaque, non-micaceous, detrital heavy mineral grains in the bentonite...

An Electron Microprobe Study of Detrital Feldspar

Arthur S. Trevena , W. P. Nash

Journal of Sedimentary Research (SEPM)

... feldspar and plagioclase is useful in provenance studies. Detrital grains of alkali feldspar more sodic than 50 weight percent albite molecule...

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

James Gaiser, Richard Van Dok

Search and Discovery.com

... classification that is based on percent of total porosity and permeability (Figure 1). These two important parameters range in percent due to matrix...

Method for Determining Permeability from Reservoir Rock Properties

Robert R. Berg

GCAGS Transactions

... of 30 to 40 percent. By considering laminar flow of fluids through pores of idealized cross sections, a general equation can be derived in which...

Theoretical Models of Porosity Reduction by Pressure Solution for Well-Sorted Sandstones

Shankar Mitra , William C. Beard

Journal of Sedimentary Research (SEPM)

... for total porosity reduction is found to exceed 26 percent. A comparison of the amount of porosity reduction due to solution and the additional reduction due...

Special Drilling Practices

E.A. Polumbus & Associates Inc.

Rocky Mountain Association of Geologists

... at these high elevations than would be adequate at sea level, A rule of thumb is that there is a 3 percent loss in engine horsepower per 1000 foot increase...

Resources for a Growing Economy: Energy and Mining Policy in Ecuador

C.I. Esquetini

Circum Pacific Council Publications

... an annual increase in energy consumption of three percent between 1973 and 1988. After a large expansion period the oil dependence decreased...

The Paleocene/Eocene Colton Formation: A Fluvial-Dominated Lacustrine Deltaic System, Roan Cliffs, Utah

Thomas H. Morris, Dean R. Richmond, Jorge E. Marino

Utah Geological Association

.... Sandstone percent within the section varies from less than 10 percent in Emma Park to greater than 50 percent in Whitmore Park. The section becomes even more...

Petrology of Holocene Sand, Peninsular Ranges, California and Baja Norte, Mexico: Implications for Provenance-Discrimination Models

Gary H. Girty, Brian J. Mossman, Scott D. Pincus

Journal of Sedimentary Research (SEPM)

... characteristics: 1) Sands derived mostly or exclusively from plutonic rocks are composed of 16-46 percent Q, 54-83 percent F, and 0.2-0.5 percent L. The medium...

Contemporary Nonmarine Sedimentation in Soviet Central Asia

Parke A. Dickey

AAPG Bulletin

.... The composition of Caspian water is compared with that of the Volga River and the ocean in Table I, expressed in percent of soluble ions. The salinity...