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The AAPG/Datapages Combined Publications Database
Showing 3,218 Results. Searched 200,693 documents.
An Explicit Full-Range Settling Velocity Equation for Mud Flocs
Kyle Strom, Ali Keyvani
Journal of Sedimentary Research (SEPM)
.... 149–152. Cheng, N.S., 2009, Comparison of formulas for drag coefficient and settling velocity of spherical particles: Powder Technology, v. 189, p...
2011
Microbial Mediation of Modern Dolomite Precipitation and Diagenesis Under Anoxic Conditions (Lagoa Vermelha, Rio de Janeiro, Brazil)
Crisogono Vasconcelos ,, Judith A. McKenzie
Journal of Sedimentary Research (SEPM)
... are better defined in this sample than in the sludge. Close examination of individual agglomerates reveals t at elliptical and spherical bodies coalesce...
1997
Diverse Stromatolite Forms from the Upper Devonian of Saskatchewan
W. L. Kaufmann
CSPG Bulletin
... nomenclature proposed by Logan et al. (1962 & 1964). Structures present included (1) spherical structures (SS); (2) composite forms of spherical...
1964
Geothermal Step in the Oil-Gas Regions of Azerbaydzhan
A. B. Tsaturyants, T. A. Gadzhieva
Petroleum Geology: A Digest of Russian Literature
.... It is well known that within a uniform spherical shell the temperature changes according to the law of the hyperbola (1): (1) t x = t 1 - t 1...
1960
Computed Sediment Grain Surface Areas
George Shumway, Kim Igelman
Journal of Sedimentary Research (SEPM)
... computed for 109 natural sediment samples ranging from sands to clays. This was done by assuming all particles to be spherical and summing the areas...
1960
The Age of Illite Cement Growth, Village Fields Area, Southern North Sea: Evidence from K-Ar Ages and 18O/16O Ratios
A. G. Robinson , M. L. Coleman , J. G. Gluyas
AAPG Bulletin
... small samples and the analyses produced Ar with an atmospheric component in excess of 90%. Such analyses normally would be considered unreliable...
1993
Using Sonic and Resistivity Effective Medium Theories to Quantify the Influence of Rock Fabric on the Mechanical Properties of Organic Mudrocks
Paul Sayar, Carlos Torres-Verdín
Unconventional Resources Technology Conference (URTEC)
.... Secondly, we append the isolated porosity using only the DEM. At this point, all the inclusions are spherical and have no preferred orientation...
2015
A.G.P.S. (A Good Place for Seismic)
Frank A. Inouye
Southeast Asia Petroleum Exploration Society (SEAPEX)
... to sustain ranges in excess of 500 kms. during the day however these same systems tend to suffer from ionospheric interference or “sky waves” during...
1992
Deposition of Free Oil by Sediments Settling in Sea Water
O. A. Poirier , George A. Thiel
AAPG Bulletin
... on the oil-settling capacity of a sediment. Notice the relative amounts of excess oil on the surfaces of tubes 4 and 5, and the increased thickness...
1941
Geological sequestration of carbon dioxide in the Cambrian Mount Simon Sandstone: Regional storage capacity, site characterization, and large-scale injection feasibility, Michigan Basin
David A. Barnes, Diana H. Bacon, Stephen R. Kelley
Environmental Geosciences (DEG)
... in the Michigan Basin, estimates of total geological sequestration capacity were determined to be in excess of 29 billion metric tons (Gt). Most...
2009
Inferred Diagenetic History of a Weakly Silicified Deep Sea Chalk
Sherwood W. Wise, Jr. , Kerry R. Kelts
GCAGS Transactions
.... Thin Braarudosphaera segments. Arrows denote positions of brightly illuminated spherical objects in Figure 4. Figure 4, phase contrast light; Figure 5...
1972
Mechanics of Basin Evolution and Its Relation to the Habitat of Oil in the Basin: Topical Papers
K. F. Dallmus
AAPG Special Volumes
... and dimensions is obtained (Fig. 1c). The shape of the earth is an oblate spheroid. The departure from the spherical shape, a flattening at the poles...
1958
Carbon Black Manufacturing
Suroso W. S., D. Djoearsa, M. S. M. Situmorang
Indonesian Petroleum Association
... graphite in structure. These crystallites then condense into a carbon black particle which is essentially spherical in shape. The crystallites assume...
1975
Pore Geometry of Sedimentary Rocks Elementary Capillary Theory
Perry O. Roehl
Bulletin of South Texas Geological Society
... be displaced by the non-wetting petroleum before significant accumulation can take place. For bulk displacement of water to occur, excess energy...
1998
Tank Experiments on the Sorting Of Beach Material During Cusp Formation
N. C. Flemming
Journal of Sedimentary Research (SEPM)
... downwards. There was no significant difference in the size sorting between cusps and bays. The most spherical particles concentrated at the foot...
1964
Sedimentology of Fault-Scarp-Derived Colluvium from the 1983 Borah Peak Rupture, Central Idaho
James P. McCalpin , Witold Zuchiewicz, L. C. Allen Jones
Journal of Sedimentary Research (SEPM)
...; where N = number of sample points), eigenvalue ratios ln(S1/S2) and ln(S2/S3), as well as spherical variance SPVAR (Table 2). Normalized eigenvalues...
1993
Geostatistical Simulation of Facies and Petrophysical Properties for Heterogeneity Modeling in A Tidal Depositional Environment: A Case Study From Upper Shale Member in A Southern Iraqi Oil Field
Watheq J. Al-Mudhafar
Unconventional Resources Technology Conference (URTEC)
... (solve the kriging equation). It was investigated that the spherical modeling is the best fit for all the indicator variograms for all the lithotypes...
2021
The Effect of Gravitational Compaction on the Structure of Sedimentary Rocks
Hollis D. Hedberg
AAPG Bulletin
... of uniformity. Theoretically, the size of grain should not affect porosity. A mathematical calculation shows that a sand of spherical grains 1 mm...
1926
Abstract: Use of petrographic investigations in prediction of combustion behaviour of inertinite rich coal and char and flyash formation
A. Kumar Varma, M. Kumar, V. Kumar Saxena, A. Sarkar
The Society for Organic Petrology (TSOP)
... which they have been prepared. SEM (scanning electron microscope) analyses of the coarsest fraction of the fly ash reveal that both spherical...
2008
"Cave Pearls" in a Cave Near Columbia, Missouri
W. D. Keller
Journal of Sedimentary Research (SEPM)
...) most of which show in thin section a fibrous radial structure. They are spherical to elliptical in shape, in FOOTNOTE 1. Hess, F. L., Oolites or cave...
1937
Available Methods for the Analysis of Vectorial Data: DISCUSSION
Ronald Green
Journal of Sedimentary Research (SEPM)
... to scepticism. However, it should be pointed out that Fisher's method is for a vector population in which the directions satisfy a spherical normal...
1964
Depositional Processes and Fluid Mechanics of Upper Jurassic Conglomerate Accumulations, British North Sea
L. G. Kessler II, Kit Moorhouse
CSPG Special Publications
... on Johnson (1970), Hampton (1975) points out that the weight and buoyancy terms in this equation are determined for spherical grains and that the strength...
1984
Pollen, PB-210, and Opaque Spherules: An Integrated Approach to Dating and Sedimentation in the Intertidal Environment
James S. Clark , William A. Patterson III
Journal of Sedimentary Research (SEPM)
.... Cushing of the University of Minnesota. Opaque Spherules In the course of counting pollen, opaque, almost spherical particles were noted in slides...
1984
Toward more accurate quartz cement models: The importance of euhedral versus noneuhedral growth rates
Robert H. Lander, Richard E. Larese, Linda M. Bonnell
AAPG Bulletin
.... Quartz typically is the dominant cement type in sandstones exposed to temperatures in excess of about 90C (194F) (McBride, 1989; Bjorklykke...
2008
Organoporosity versus Mineral Matrix Porosity in the Calculation of Reserves in Shale Reservoirs
G. B. Asquith
West Texas Geological Society
... is correct? The Maxwell-Garnett Equation which was designed model large spherical pores in bedded in finer spherical matrix pores (i.e. a vuggy...
2013