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Berlin Brandenburg

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  • 1
    Language: English
    In: AAPG Bulletin, 1998, Vol.82 (1998)
    ISSN: 0149-1423
    Source: AAP/Datapages (via CrossRef)
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  • 2
    Language: English
    In: AAPG Bulletin, 1997, Vol.81 (1997)
    ISSN: 0149-1423
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  • 3
    Language: English
    In: AAPG Bulletin, 8/2008, Vol.92(8), pp.1077-1106
    Description: The gas generative potential of the Cretaceous Cameo coal in the Piceance Basin, northwestern Colorado, was evaluated quantitatively by sealed gold tube pyrolysis. The H/C and O/C elemental ratios show that pyrolyzed Cameo coal samples follow the Van Krevelen humic coal evolution pathway, reasonably simulating natural coal maturation. Kinetic parameters (activation energy and frequency factor) for gas generation and vitrinite reflectance (R{sub o}) changes were calculated from pyrolysis data. Experimental R{sub o} results from this study are not adequately predicted by published R{sub o} kinetics and indicate the necessity of deriving basin-specific kinetic parameters when building predictive basin models. Using derived kinetics for R{sub o}, evolution and gas generation, basin modeling was completed for 57 wells across the Piceance Basin, which enabled the mapping of coal-rank and coalbed gas potential. Quantities of methane generated at approximately 1.2% R{sub o} are about 300 standard cubic feet per ton (scf/ton) and more than 2500 scf/ton (in-situ dry-ash-free coal) at R{sub o}, values reaching 1.9%. Gases generated in both low- and high-maturity coals are less wet, whereas the wetter gas is expected where R{sub o} is approximately 1.4-1.5%. As controlled by regional coal rank and net coal thickness, the largest in-place coalbed gas resources are located in the central part of the basin, where predicted volumes exceed 150 bcf/mi, excluding gases in tight sands. Journal Article.
    Keywords: Coal, Lignite, And Peatcolorado ; Usa ; Methane ; Coal Deposits ; Cretaceous Period ; Sedimentary Basins ; Maturation ; Coalification ; Kinetics ; Reflectivity ; Vitrinite ; Simulation ; Resource Assessment ; Coal Rank ; Piceance Creek Basin;
    ISSN: 0149-1423
    E-ISSN: 15589153
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  • 4
    Language: English
    In: AAPG Bulletin, 5/2008, Vol.92(5), pp.549-556
    Description: A research conference originally scheduled as a Hedberg Research Conference examining the origins of oil and gas was held in Calgary, June 2005. This report summarizes the 14 presentations made at the conference, which discussed data and evidence regarding the abiogenic and biogenic origins of petroleum. In addition, the postpresentation discussion is summarized. Multiple concepts for the abiogenic formation of petroleum were presented. These concepts fell mostly into two broad families: mantle degassing associated with the polymerization of low molecular weight compounds and serpentization in association with Fischer-Tropsch reactions. The Fischer-Tropsch reactions are catalyzed reactions in which carbon monoxide and hydrogen are converted into hydrocarbons. The presentations on the biogenic origin presented a uniform model in which sedimentary organic matter is thermally converted to oil and gas. Little common ground was found to exist between the abiogenic and biogenic schools of petroleum formation, with the possible exception of the importance of fluid flow in controlling the formation of hydrocarbon accumulations. Although few, if any, conference participants changed their perspectives, most concluded that the meeting was informative and a useful exercise.
    Keywords: Economic Geology, Geology Of Energy Sources ; Chemical Reactions ; Concepts ; Controls ; Genesis ; Petroleum ; Petroleum Accumulation ; Petroleum Exploration ; Production ; Research ; Review;
    ISSN: 0149-1423
    E-ISSN: 15589153
    Source: AAP/Datapages (via CrossRef)
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  • 5
    Language: English
    In: AAPG Bulletin, 1998, Vol.82
    ISSN: 0149-1423
    Source: AAP/Datapages (via CrossRef)
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  • 6
    Language: English
    In: AAPG Bulletin, 1995, Vol.79
    ISSN: 0149-1423
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  • 7
    Language: English
    In: AAPG Bulletin, 10/2007, Vol.91(10), pp.1437-1447
    Description: A joint AAPG/Associacion Mexicana de Geologos Petroleros (AMGP) Hedberg Research Conference was held to examine issues associated with heavy oil in deep water. This article reports on the meeting highlights. Deep-water exploration has become increasingly important over the last three decades. For the deep-water environment to be economically viable, these accumulations need to be both volumetrically significant and capable of maintaining high production rates. Largely independent of the rise in crude oil price, there has been an increasing number of economically viable deep-water discoveries, where the resource base now exceeds 100 billion bbl oil equivalent. A significant percentage of this resource is heavy oil, with heavy oil dominating the resource base in such settings as offshore Mexico and Brazil. Economic success in both exploration and commercialization requires integration across disciplines as well as across the value chain, integrating the upstream, midstream, and downstream operations. Basin models were commonly used as the integration tool for exploration programs. The exploration risks associated with the deep-water environment tend to be higher, in part as a result of oil quality. Risk reduction can be partially accomplished through a better understanding of the factors that control oil quality, including source rock facies, thermal maturity, and the alteration and migration histories. Although several factors may impact crude quality, the consensus was that biodegradation was the dominant factor controlling quality in most deep-water regions, Mexico being an exception, where source rock character has an important function. Biodegradation is controlled by such factors as charge and thermal history and the geometry of the oil-water contact. Where source facies is a key factor in establishing the presence of heavy-oil migration, distances tend to be more limited. Mixing of oils also appears to be an important factor in determining oil quality, often improving or maintaining oil quality, with the introduction of light oils into biodegraded oil. The production of these heavy oils introduces several challenges above and beyond those associated with similar accumulations onshore and in shallow waters. Lessons learned from these settings can, however, be very useful when working in the deep-water setting. The value of continuous data collection and updating reservoir models was made clear in case studies from both Angola and Brazil, where phased development or reservoir model recycling permitted the more efficient use of capital. Also of importance is the need for long-term planning because of the long lives of heavy-oil accumulations.
    Keywords: Economic Geology, Geology Of Energy Sources ; Aapg ; Associacion Mexicana De Geologos Petroleros ; Associations ; Brazil ; Deep-Water Environment ; Economics ; Genesis ; Heavy Oil ; Mexico ; Models ; Petroleum ; Petroleum Exploration ; Prediction ; Price ; Production ; Recovery ; South America ; Symposia;
    ISSN: 0149-1423
    E-ISSN: 15589153
    Source: AAP/Datapages (via CrossRef)
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  • 8
    Language: English
    In: AAPG Bulletin, 4/2007, Vol.91(4), pp.501-521
    Description: The generative gas potential of the Mississippian Barnett Shale in the Fort Worth Basin, Texas, was quantitatively evaluated by sealed gold-tube pyrolysis. Kinetic parameters for gas generation and vitrinite reflectance (R (sub o) ) changes were calculated from pyrolysis data and the results used to estimate the amount of gas generated from the Barnett Shale at geologic heating rates. Using derived kinetics for R (sub o) evolution and gas generation, quantities of hydrocarbon gas generated at R (sub o) approximately 1.1% are about 230 L/t (7.4 scf/t) and increase to more that 5800 L/t (186 scf/t) at R (sub o) approximately 2.0% for a sample with an initial total organic carbon content of 5.5% and R (sub o) = 0.44%. The volume of shale gas generated will depend on the organic richness, thickness, and thermal maturity of the shale and also the amount of petroleum that is retained in the shale during migration. Gas that is reservoired in shales appears to be generated from the cracking of kerogen and petroleum that is retained in shales, and that cracking of the retained petroleum starts by R (sub o) approximately 1.1%. This result suggests that the cracking of petroleum retained in source rocks occurs at rates that are faster than what is predicted for conventional siliciclastic and carbonate reservoirs, and that contact of retained petroleum with kerogen and shale mineralogy may be a critical factor in shale-gas generation. Shale-gas systems, together with overburden, can be considered complete petroleum systems, although the processes of petroleum migration, accumulation, and trap formation are different from what is defined for conventional petroleum systems.
    Keywords: Economic Geology, Geology Of Energy Sources ; Barnett Shale ; Carbonate Rocks ; Carboniferous ; Chemical Composition ; Chesterian ; Clastic Rocks ; Evaluation ; Fort Worth Basin ; Genesis ; Kerogen ; Kinetics ; Macerals ; Meramecian ; Migration ; Mississippian ; Models ; Natural Gas ; Organic Compounds ; Paleozoic ; Petroleum ; Petroleum Accumulation ; Processes ; Pyrolysis ; Quantitative Analysis ; Reservoir Rocks ; Rock-Eval ; Sedimentary Rocks ; Shale ; Siliciclastics ; Source Rocks ; Temperature ; Texas ; Thermal Maturity ; Total Organic Carbon ; United States ; Upper Mississippian ; Vitrinite Reflectance;
    ISSN: 0149-1423
    E-ISSN: 15589153
    Source: AAP/Datapages (via CrossRef)
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  • 9
    Language: English
    In: AAPG Bulletin, 1993, Vol.77
    ISSN: 0149-1423
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  • 10
    Language: English
    In: AAPG Bulletin, 1991, Vol.75
    ISSN: 0149-1423
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