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  • 1
    Electronic Resource
    Electronic Resource
    Equilibria in the gas system S-O-C between 550 and 1100°C (1979)
    Springer
    Oxidation of metals 13 (1979), S. 3-12 
    Details
    ISSN: 1573-4889
    Keywords: S-O-C equilibria ; computer calculations ; sulfur and oxygen partial pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Equilibria in the S-O-C gas system have been calculated, for a variety of starting values of CO, CO2, and SO2 between 550–1100° C, assuming the existence of 10 gaseous species. It is shown that the species COS, SO3, CS, and SO may form in concentrations sufficiently high that values of sulfur and oxygen partial pressures, calculated from the initial values of CO, CO2, and SO2, are in error. Results are given for three sets of initial compositions and are available for 39 more.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00715867
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The penetration by sulfur of NiO scales growing on nickel (1978)
    Springer
    Oxidation of metals 12 (1978), S. 173-181 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; hot corrosion ; sulfidation ; preoxidation ; scale penetration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The transport of sulfur through growing scales may occur by chemical (solution and diffusion) or physical (gas molecule permeation) mechanisms. Both possibilities are examined theoretically for the case of NiO growing on nickel. Experiments are designed and carried out to establish which mechanism plays the major role in sulfur transport. The results indicate that the physical mechanism is likely to be predominant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00740258
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  • 3
    Electronic Resource
    Electronic Resource
    Sulfur solubility in NiO and CoO at 1000°C (1978)
    Springer
    Oxidation of metals 12 (1978), S. 191-204 
    Details
    ISSN: 1573-4889
    Keywords: sulfur solubility ; NiO ; CoO ; defect structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The solubility of sulfur in NiO and CoO at 1000°C has been investigated over a wide range of oxygen and sulfur partial pressures using CO, CO2, and SO2 as input gases. The concentration of dissolved sulfur increases regularly with sulfur partial pressure but appears to be insensitive to oxygen partial pressure. Dissolution of sulfur did not affect the electrical conductivity of NiO samples. It was concluded that sulfur probably dissolves, in the range 10−2 −10−3%, either by exchange with O−2 ions occuping O−2 sites as S−2 ions, or as neutral sulfur on interstitial sites. The scatter in results prevented a more definite conclusion being drawn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00740260
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  • 4
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    Integrated rock classification in carbonate formations based on elastic and petrophysical properties estimated from conventional well logs (2015)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2015-07-07
    Description: A reliable rock classification in a carbonate reservoir should take into account petrophysical, compositional, and elastic properties of the formation. However, depth-by-depth assessment of these properties is challenging because of the complex pore geometries and significant heterogeneity caused by diagenesis. Common rock-classification methods in carbonate formations do not incorporate the impact of both depositional and diagenetic modifications on rock properties. Furthermore, elastic properties, which control fracture propagation and the conductivity of fracture under closure stress, commonly are not accounted for in conventional rock-classification techniques. We apply an integrated rock-classification technique, based on both depositional and diagenetic effects that can ultimately enhance (1) assessment of petrophysical properties, (2) selection of candidates for fracture treatment, and (3) production in carbonate reservoirs. We apply the conductive and the elastic self-consistent approximation theories to estimate depth-by-depth volumetric concentration of interparticle (e.g., interconnected pore space) and intraparticle (e.g., vugs) pores, as well as elastic bulk and shear moduli, in the formation. This process takes into account the impact of shape and volumetric concentrations of rock components on electrical conductivity and elastic properties. We document a successful application of the introduced technique in two wells in the upper Leonardian carbonate interval of Veterans field in west Texas. The identified rock types were verified using thin-section images and core samples. We estimate elastic moduli as well as interparticle porosity with average relative errors of approximately 8% and 10% compared to the core measurements, respectively. Furthermore, the well-log-based estimates of permeability and water saturation are improved by approximately 50% and 20%, respectively, after considering rock classification. Finally, we explain that the fracture propagation failure in the second well (i.e., well B) could be the result of relatively lower Young’s modulus in the rock class corresponding to fracture locations.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
    Published by American Association of Petroleum Geologists (AAPG)
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  • 5
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    U-Pb detrital zircon geochronology of the Upper Paleocene to Lower Eocene Wilcox Group, east-central Texas (2016)
    Geological Society of America (GSA)
    In: Geosphere
    Details
    Publication Date: 2016-10-08
    Description: Arrival of Laramide uplift sediments to the Texas Gulf Coastal Plain and northwestern Gulf of Mexico during the early Paleogene is recorded in strata of the Wilcox Group as a significant increase in sediment accumulation and with the appearance of 65–52 Ma detrital zircons that correspond with the timing of late Laramide uplift. New U-Pb dating of detrital zircons by laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) for samples obtained from the Lower Paleocene Tehuacana Member through the Lower Eocene Queen City Formation in east-central Texas identifies the Hooper Formation of the Wilcox Group as the oldest stratigraphic unit to contain 65–52 Ma ages. Late appearance of 65–52 Ma detrital zircons in the Hooper Formation is correlated with unroofed Laramide magmatic intrusions or nearly syndepositional volcaniclastic sources; whereas older detrital zircons are inferred to be derived primarily from sedimentary cover and basement rocks exposed during uplift of Laramide blocks. Potential source region and Gulf Coastal Plain detrital zircon data support a relatively similar paleodrainage area and sediment sources for east-central Texas Tehuacana Member to Carrizo Formation and central Louisiana Wilcox Group data, and for east-central Texas Queen City Formation and central Louisiana middle-upper Claiborne Group data. South Texas Wilcox Group data contrast with data from these samples and support a different paleodrainage area and sediment sources for the south Texas region. We propose that headwaters sourced from southeastern Wyoming to the southern Rocky Mountain region delivered sediments to east-central Texas and central Louisiana during the Paleocene to Middle Eocene. Pronounced Mesoproterozoic and Neoproterozoic detrital zircons in the lower Claiborne Group of east-central Texas and the middle-upper Claiborne Group of central Louisiana are attributed to new or unroofed recycled sediments with Grenvillian age detrital zircons incorporated from the Ouachita region and other proximal locations in the preexisting paleodrainage area. The inferred paleodrainage area for east-central Texas and central Louisiana includes most of the Rocky Mountain Laramide uplift blocks, has a southern boundary separating it from a south Texas paleodrainage, and an eastern boundary roughly coincident with the Mississippi embayment, which separates it from Appalachian Mountains drainages.
    Electronic ISSN: 1553-040X
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 6
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    High-resolution sequence stratigraphy of the Upper Ordovician Montoya Group, southern New Mexico and western Texas: Outcrop analog of an unconventional chert and carbonate reservoir (2014)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2014-07-26
    Description: The Upper Ordovician Montoya Group crops out in southern New Mexico and westernmost Texas and records predominantly subtidal deposition on a gently dipping carbonate ramp that was subsequently almost entirely dolomitized. The Montoya Group is a third-order composite sequence composed of six regionally correlative, shallowing-upward, third-order depositional sequences (M0–M5). Sequence M0 has sandstone at its base that is overlain by skeletal packstone-grainstone. Sequence M0 occurs only locally and was likely deposited in a topographic low formed during regional development of the unconformity following El Paso Group deposition. Sequence M1, marking the initial widespread transgression over the Ellenburger unconformity, consists of sandstone updip that passes downramp into skeletal packstone. The highstand systems tract (HST) of M1 consists of a prograding skeletal grainstone that was subaerially exposed upramp. Sequence M2, which contains the second-order maximum flooding surface, has abundant subtidal cherty carbonate at its base, which shallows upward into a widespread, prograding coral packstone-grainstone in the HST. Sequence M3 also contains abundant downramp chert that passes upramp into an aggrading crinoidal shoal and farther upramp into peritidal mudstone. Sequence M4 records an extensive basinward shift in facies as peritidal burrowed and cryptalgalaminated mudstone prograded over subtidal carbonate. Sequence M5 is only locally developed downramp and consists of crinoidal grainstone with abundant evidence of subaerial exposure. A regional unconformity separates the Montoya Group from the Silurian Fusselman Dolostone or younger units. Parasequences (meter-scale cycles) recording low- to moderate-amplitude relative sea level fluctuations are ubiquituous features at individual outcrops but are difficult to correlate regionally. The abundance of syn- or early depositional chert in the subtidal facies indicates that the Montoya Group was deposited within a region of strong regional upwelling along southern Laurentia. This early formed chert was the reservoir facies in a successful Upper Ordovician gas play in Ward and Reeves Counties, Texas.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
    Published by American Association of Petroleum Geologists (AAPG)
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  • 7
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    Three-dimensional pore connectivity evaluation in a Holocene and Jurassic microbialite buildup (2013)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2013-11-03
    Description: Microbial carbonates have complex pore networks formed by their biological growth framework, which later may be modified by diagenetic alteration. A proper evaluation of the porous media characteristics and their evolution is essential to better characterize microbial carbonate reservoirs. However, conventional methods of fundamental rock characteristic description are insufficient to elucidate the heterogeneity of pore networks and textural shifts. X-ray computed tomography allows a better evaluation of these fundamental characteristics, which, when integrated with stratigraphic analysis, enhances the understanding of the volume and connectivity of pore networks in different microbial textures. A three-dimensional evaluation of a Holocene microbialite from Brazil provides insights about how the primary pore network is related to the textural changes in microbialite successions, which, in ancient deposits, may be reduced or enhanced by diagenesis. Conventional methods such as petrography, carbon and oxygen stable isotope analysis, and laboratory measurements for porosity and permeability were integrated with computed tomography images and three-dimensional rendering to provide a high-resolution history of the evolution of porosity and permeability within this microbialite. The pore network differences are related to microbial textural evolution driven by environmental changes. The depositional textures control petrophysical properties based on fundamental rock characteristics such as structure size, structure packing, and framework fabric. Those fundamental characteristics influence the pore volume and number of pore throats. Large structures, open packing, and chaotic framework fabric result in a better connected pore network, whereas small structures, tight packing, and organized fabric result in less connected pore networks. Comparative pore geometry analysis of the Upper Jurassic Smackover Formation thrombolites shows that their depositional textures also had high primary porosity values. If the microbial textures and petrophysical properties are environmentally controlled, their prediction in the subsurface is made possible by refined depositional models.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
    Published by American Association of Petroleum Geologists (AAPG)
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  • 8
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    Importance of depositional texture in pore characterization of subsalt microbialite carbonates, offshore Brazil (2015)
    Geological Society (of London)
    Details
    Publication Date: 2015-02-28
    Description: Microbialite carbonates (e.g. stromatolites, thrombolites, shrubs and spherulites) are sedimentary deposits highly influenced by their environmental settings such as water depth, water chemistry and relative energy. Lower Cretaceous subsalt microbialite carbonates, in the Santos Basin (Brazil), have complex pore systems produced by their growth framework, which are related to carbonate precipitation by biotic and abiotic processes and also influenced by subsequent cementation and dissolution. Complex pore systems and high spatial reservoir heterogeneity result in reservoirs having total porosity ranging from 2 to 27% and permeability from less than 0.01 milidarcys to 4.9 darcys. Differences in textural characteristics such as shrub size, sorting and packing lead to different pore systems that subsequently control the petrophysical properties. Cements and dissolution also modify these texturally controlled pore systems by respectively reducing or enhancing the pore volume and pore-throats. The shrub size is a primary control on changes in the pore size and affects the permeability, whereas the shrub sorting influences the primary porosity, and secondarily the permeability. Packing acts as a secondary control on porosity. As result, a sample with small shrubs, well-sorted and tight packing has lower permeability for the same range of porosity than a sample with the same characteristics, but larger shrubs.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society (of London)
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  • 9
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    Paleoproterozoic Stark Formation, Athapuscow Basin, Northwest Canada: Record of Cratonic-Scale Salinity Crisis (2003)
    Society for Sedimentary Geology
    Details
    Publication Date: 2003-03-01
    Print ISSN: 1527-1404
    Electronic ISSN: 1938-3681
    Topics: Geosciences
    Published by Society for Sedimentary Geology
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  • 10
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    Evaporitic Subtidal Stromatolites Produced by in situ Precipitation: Textures, Facies Associations, and Temporal Significance (2000)
    Society for Sedimentary Geology
    Details
    Publication Date: 2000-09-01
    Print ISSN: 1527-1404
    Electronic ISSN: 1938-3681
    Topics: Geosciences
    Published by Society for Sedimentary Geology
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