The Experts below are selected from a list of 3711 Experts worldwide ranked by ideXlab platform
Romeo M Flores - One of the best experts on this subject based on the ideXlab platform.
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methanogenic pathways of Coal bed gas in the powder river basin united states the geologic factor
International Journal of Coal Geology, 2008Co-Authors: Romeo M Flores, Gary D Stricker, Cynthia A Rice, Augusta Warden, Margaret S EllisAbstract:Abstract Coal-bed gas of the Tertiary Fort Union and Wasatch Formations in the Powder River Basin in Wyoming and Montana, U.S. was interpreted as microbial in origin by previous studies based on limited data on the gas and water composition and isotopes associated with the Coal beds. To fully evaluate the microbial origin of the gas and mechanisms of methane generation, additional data for 165 gas and water samples from 7 different Coal-bed methane-bearing Coal-bed reservoirs were collected basinwide and correlated to the Coal Geology and stratigraphy. The C1/(C2 + C3) ratio and vitrinite reflectance of Coal and organic shale permitted differentiation between microbial gas and transitional thermogenic gas in the central part of the basin. Analyses of methane δ13C and δD, carbon dioxide δ13C, and water δD values indicate gas was generated primarily from microbial CO2 reduction, but with significant gas generated by microbial methyl-type fermentation (aceticlastic) in some areas of the basin. Microbial CO2 reduction occurs basinwide, but is generally dominant in Paleocene Fort Union Formation Coals in the central part of the basin, whereas microbial methyl-type fermentation is common along the northwest and east margins. Isotopically light methane δ13C is distributed along the basin margins where δD is also depleted, indicating that both CO2-reduction and methyl-type fermentation pathways played major roles in gas generation, but gas from the latter pathway overprinted gas from the former pathway. More specifically, along the northwest basin margin gas generation by methyl-type fermentation may have been stimulated by late-stage infiltration of groundwater recharge from clinker areas, which flowed through highly fractured and faulted Coal aquifers. Also, groundwater recharge controlled a change in gas composition in the shallow Eocene Wasatch Formation with the increase of nitrogen and decrease of methane composition of the Coal-bed gas. Other geologic factors, such as burial, thermal and maturation history, lateral and vertical continuity, and Coalification of the Coal beds, also played a significant role in controlling methanogenic pathways and provided new perspectives on gas evolution and emplacement. The early-stage gas produced by CO2 reduction has mixed with transitional thermogenic gas in the deeper, central parts of the Powder River Basin to form ‘old’ gas, whereas along the basin margins the overprint of gas from methyl-type fermentation represents ‘new’ gas. Thus, a clear understanding of these geologic factors is necessary to relate the microbiological, biogeochemical, and hydrological processes involved in the generation of Coal-bed gas.
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alaska Coal Geology resources and Coalbed methane potential
Data Series, 2004Co-Authors: Romeo M Flores, Gary D Stricker, Scott A KinneyAbstract:Estimated Alaska Coal resources are largely in Cretaceous and Tertiary rocks distributed in three major provinces, Northern Alaska-Slope, Central Alaska-Nenana, and Southern Alaska-Cook Inlet. Cretaceous resources, predominantly bituminous Coal and lignite, are in the Northern Alaska-Slope Coal province. Most of the Tertiary resources, mainly lignite to subbituminous Coal with minor amounts of bituminous and semianthracite Coals, are in the other two provinces. The combined measured, indicated, inferred, and hypothetical Coal resources in the three areas are estimated to be 5,526 billion short tons (5,012 billion metric tons), which constitutes about 87 percent of Alaska's Coal and surpasses the total Coal resources of the conterminous United States by 40 percent. Coal mining has been intermittent in the Central Alaskan-Nenana and Southern Alaska-Cook Inlet Coal provinces, with only a small fraction of the identified Coal resource having been produced from some dozen underground and strip mines. Alaskan Coals have a lower sulfur content (averaging 0.3 percent) than most Coals in the conterminous United States and are within or below the minimum sulfur value mandated by the 1990 Clean Air Act amendments. Another untapped potential resource is Coalbed methane estimated to total 1,000 trillion cubic feet (28 trillion cubic meters).
Gary D Stricker - One of the best experts on this subject based on the ideXlab platform.
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methanogenic pathways of Coal bed gas in the powder river basin united states the geologic factor
International Journal of Coal Geology, 2008Co-Authors: Romeo M Flores, Gary D Stricker, Cynthia A Rice, Augusta Warden, Margaret S EllisAbstract:Abstract Coal-bed gas of the Tertiary Fort Union and Wasatch Formations in the Powder River Basin in Wyoming and Montana, U.S. was interpreted as microbial in origin by previous studies based on limited data on the gas and water composition and isotopes associated with the Coal beds. To fully evaluate the microbial origin of the gas and mechanisms of methane generation, additional data for 165 gas and water samples from 7 different Coal-bed methane-bearing Coal-bed reservoirs were collected basinwide and correlated to the Coal Geology and stratigraphy. The C1/(C2 + C3) ratio and vitrinite reflectance of Coal and organic shale permitted differentiation between microbial gas and transitional thermogenic gas in the central part of the basin. Analyses of methane δ13C and δD, carbon dioxide δ13C, and water δD values indicate gas was generated primarily from microbial CO2 reduction, but with significant gas generated by microbial methyl-type fermentation (aceticlastic) in some areas of the basin. Microbial CO2 reduction occurs basinwide, but is generally dominant in Paleocene Fort Union Formation Coals in the central part of the basin, whereas microbial methyl-type fermentation is common along the northwest and east margins. Isotopically light methane δ13C is distributed along the basin margins where δD is also depleted, indicating that both CO2-reduction and methyl-type fermentation pathways played major roles in gas generation, but gas from the latter pathway overprinted gas from the former pathway. More specifically, along the northwest basin margin gas generation by methyl-type fermentation may have been stimulated by late-stage infiltration of groundwater recharge from clinker areas, which flowed through highly fractured and faulted Coal aquifers. Also, groundwater recharge controlled a change in gas composition in the shallow Eocene Wasatch Formation with the increase of nitrogen and decrease of methane composition of the Coal-bed gas. Other geologic factors, such as burial, thermal and maturation history, lateral and vertical continuity, and Coalification of the Coal beds, also played a significant role in controlling methanogenic pathways and provided new perspectives on gas evolution and emplacement. The early-stage gas produced by CO2 reduction has mixed with transitional thermogenic gas in the deeper, central parts of the Powder River Basin to form ‘old’ gas, whereas along the basin margins the overprint of gas from methyl-type fermentation represents ‘new’ gas. Thus, a clear understanding of these geologic factors is necessary to relate the microbiological, biogeochemical, and hydrological processes involved in the generation of Coal-bed gas.
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alaska Coal Geology resources and Coalbed methane potential
Data Series, 2004Co-Authors: Romeo M Flores, Gary D Stricker, Scott A KinneyAbstract:Estimated Alaska Coal resources are largely in Cretaceous and Tertiary rocks distributed in three major provinces, Northern Alaska-Slope, Central Alaska-Nenana, and Southern Alaska-Cook Inlet. Cretaceous resources, predominantly bituminous Coal and lignite, are in the Northern Alaska-Slope Coal province. Most of the Tertiary resources, mainly lignite to subbituminous Coal with minor amounts of bituminous and semianthracite Coals, are in the other two provinces. The combined measured, indicated, inferred, and hypothetical Coal resources in the three areas are estimated to be 5,526 billion short tons (5,012 billion metric tons), which constitutes about 87 percent of Alaska's Coal and surpasses the total Coal resources of the conterminous United States by 40 percent. Coal mining has been intermittent in the Central Alaskan-Nenana and Southern Alaska-Cook Inlet Coal provinces, with only a small fraction of the identified Coal resource having been produced from some dozen underground and strip mines. Alaskan Coals have a lower sulfur content (averaging 0.3 percent) than most Coals in the conterminous United States and are within or below the minimum sulfur value mandated by the 1990 Clean Air Act amendments. Another untapped potential resource is Coalbed methane estimated to total 1,000 trillion cubic feet (28 trillion cubic meters).
Matthew E Caddel - One of the best experts on this subject based on the ideXlab platform.
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foreword cspg william c gussow mini conferences proceedings from Coal bed methane back to the basics of Coal Geology
Bulletin of Canadian Petroleum Geology, 2006Co-Authors: L D Stasiuk, Peter D Warwick, Matthew E CaddelAbstract:This special issue of the Bulletin of Canadian Petroleum Geology is based primarily on presentations made at the William C. Gussow ‘mini-conference’, “ Coal Bed Methane — Back to the Basics of Coal Geology” , held in scenic Canmore, Alberta, March 9–11, 2005. The conference was co-organized along with The Society for Organic Petrology (http://www.tsop.org/) and the Canadian Society for Coal Science and Organic Petrology (http://www.cscop.org/), and the Canadian Society for Unconventional Gas (http://www.csug.ca/). These special Gussow conferences are organized by chairs of the CSPG Technical Divisions and managed by the CSPG office conference staff. The CBM Gussow conference 2005 was chaired by Matt Caddel. The CSPG describes the “ Gussow geoscience conferences as meetings focusing on new and emerging issues related to the petroleum industry. The meeting is intended to bring together recognized experts from diverse disciplines to provide a broad range of perspectives on the conference theme. The meetings are held in autumn …
Margaret S Ellis - One of the best experts on this subject based on the ideXlab platform.
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methanogenic pathways of Coal bed gas in the powder river basin united states the geologic factor
International Journal of Coal Geology, 2008Co-Authors: Romeo M Flores, Gary D Stricker, Cynthia A Rice, Augusta Warden, Margaret S EllisAbstract:Abstract Coal-bed gas of the Tertiary Fort Union and Wasatch Formations in the Powder River Basin in Wyoming and Montana, U.S. was interpreted as microbial in origin by previous studies based on limited data on the gas and water composition and isotopes associated with the Coal beds. To fully evaluate the microbial origin of the gas and mechanisms of methane generation, additional data for 165 gas and water samples from 7 different Coal-bed methane-bearing Coal-bed reservoirs were collected basinwide and correlated to the Coal Geology and stratigraphy. The C1/(C2 + C3) ratio and vitrinite reflectance of Coal and organic shale permitted differentiation between microbial gas and transitional thermogenic gas in the central part of the basin. Analyses of methane δ13C and δD, carbon dioxide δ13C, and water δD values indicate gas was generated primarily from microbial CO2 reduction, but with significant gas generated by microbial methyl-type fermentation (aceticlastic) in some areas of the basin. Microbial CO2 reduction occurs basinwide, but is generally dominant in Paleocene Fort Union Formation Coals in the central part of the basin, whereas microbial methyl-type fermentation is common along the northwest and east margins. Isotopically light methane δ13C is distributed along the basin margins where δD is also depleted, indicating that both CO2-reduction and methyl-type fermentation pathways played major roles in gas generation, but gas from the latter pathway overprinted gas from the former pathway. More specifically, along the northwest basin margin gas generation by methyl-type fermentation may have been stimulated by late-stage infiltration of groundwater recharge from clinker areas, which flowed through highly fractured and faulted Coal aquifers. Also, groundwater recharge controlled a change in gas composition in the shallow Eocene Wasatch Formation with the increase of nitrogen and decrease of methane composition of the Coal-bed gas. Other geologic factors, such as burial, thermal and maturation history, lateral and vertical continuity, and Coalification of the Coal beds, also played a significant role in controlling methanogenic pathways and provided new perspectives on gas evolution and emplacement. The early-stage gas produced by CO2 reduction has mixed with transitional thermogenic gas in the deeper, central parts of the Powder River Basin to form ‘old’ gas, whereas along the basin margins the overprint of gas from methyl-type fermentation represents ‘new’ gas. Thus, a clear understanding of these geologic factors is necessary to relate the microbiological, biogeochemical, and hydrological processes involved in the generation of Coal-bed gas.
E A Panova - One of the best experts on this subject based on the ideXlab platform.
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basin evolution and Coal Geology of the donets basin ukraine russia an overview
International Journal of Coal Geology, 2012Co-Authors: R F Sachsenhofer, V A Privalov, E A PanovaAbstract:Abstract The Donets Basin is a major Coal-mining district in eastern Ukraine and adjacent portions of Russia. It comprises the Donbas Foldbelt, which is the uplifted and compressionally deformed part of the Pripyat–Dniepr–Donets (PDD) Basin, and the significantly less deformed Western Donbas region. The PDD Basin is a Late Devonian rift structure located within the East European Craton. Thick Coal-measures formed during the post-rift stage of the basin in Serpukhovian to Moscovian times, when about 130 seams, each with a thickness over 0.45 m, have been deposited. Early Serpukhovian Coal accumulated in a relatively narrow shore-zone. It is rich in inertinite and liptinite and very low in ash. Bashkirian and Moscovian Coal have a significantly wider lateral extension and are generally rich in vitrinite. Bashkirian and Moscovian Coal seams usually have high ash yields (12–18%) and high sulfur contents (2.5–3.5%), but these data vary significantly depending on peat facies. Coal rank ranges from subbituminous to anthracite and is mainly controlled by the depth of the seams and the heat flow during maximum (Permian) burial. Permo-Triassic thermal events locally overprinted the resulting Coalification pattern. Coked Coal occurs at the contact to presumed Permian sills and dikes southwest of Donetsk. Deep Permian burial was followed by major Permian and Mesozoic uplift events. The Donets Basin hosts proven reserves in the order of 60 Gt at the exploitable depth. The thickness of Coal seams currently mined is in the range of 0.6 to 2.5 m. Production during 2009 was 68.7 Mt in the Ukrainian and 4.9 Mt in the Russian part of the basin. Coal mines in the Donets Basin are among the gassiest in the world. The average methane content of Coal is 14.7 m³/t, but numerous seams have significantly higher gas content. The high methane content presents a severe mine safety problem. On the other hand, it represents also a high potential for Coal mine bed methane projects. Emissions of Coal gas released by mining and related structurally induced underground hazards (Coal and gas outbursts) are a major problem for safe and efficient Coal exploitation in the basin.