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  • 1
    Series available for loan
    Series available for loan
    Paleo oil- and gasfields in the Rotliegend of the North German Basin : effects upon hydrocarbon reservoir quality (2005)
    Hamburg : DGMK
    Associated volumes
    Details Availability
    Call number: S 97.0506(593-8)
    In: Tight gas reservoirs - natural gas for the future
    Description / Table of Contents: An integrated study was performed with the objective to improve reservoir quality prediction from 3D seismics, geological data and concepts. Seismic facies classes, derived from Neural Network analysis, correlate with reservoir characteristics. They can be used for predictive exploration purposes. Deformation zones indicate the extent of extensional fractures, which can have positive or negative effects on reservoir characteristics, depending on the diagenetic facies. The diagenetic conceptional model has been substantiated, verified in essential parts, and extended (inversion of reservoir qualities), based on well data, modelling and seismic analysis. Petroleum System Modelling added the time frame for diverse relevant processes and enabled to evaluate their effects on hydrocarbon migration. The importance of pre-oil hydrocarbon migration and spatial distance to Carboniferous source rocks for Rotliegend reservoir characteristics must be stressed.
    Type of Medium: Series available for loan
    Pages: Getr. Zählung
    Edition: Als Ms. gedr.
    ISBN: 3936418314
    Series Statement: DGMK-Forschungsbericht 593-8
    Classification:
    Deposits
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Organic geochemistry of freshwater and alkaline lacustrine sediments in the Green River Formation of the Washakie Basin, Wyoming, U.S.A.
    Amsterdam : Elsevier
    Organic Geochemistry 22 (1994), S. 415-440 
    Details
    ISSN: 0146-6380
    Keywords: 4-methylsteroids ; Green River Formation ; Washakie Basin ; alkaline/freshwater lakes ; high-wax crude oil ; kerogen formation ; kinetics ; lacustrine source rocks ; oleanane ; sequence stratigraphy
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0146-6380(94)90117-1
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quantification of Organic Matter Degradation by Microbial Sulphate Reduction for Quaternary Sediments from the Northern Arabian Sea (1997)
    Springer
    Naturwissenschaften 84 (1997), S. 312-315 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050402
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  • 4
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    Hydrocarbon potential of Ordovician-Silurian successions in Akkas field, western desert of Iraq (2015)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2015-04-07
    Description: The shale beds of the Khabour and Akkas Formations (Ordovician–Silurian) in Akkas field of western Iraq have been studied to determine their hydrocarbon-generation potential. The total organic carbon (TOC) values of the Khabour Formation were generally low and associated with low S2 and hydrogen index (HI) values indicating that this formation is not a hydrocarbon source, although this could reflect advanced thermal maturity. The gray-green shales of the upper part of the Akkas Formation also have low TOC and S2 values. On the other hand, the TOC, S2, and HI values of the black shales of the lower part of the Akkas Formation were high. The values indicate that the gray-green shales of the upper part of the Akkas Formation are not petroleum sources, whereas the black shales of the lower part can be regarded as potential hydrocarbon source rocks. Organic petrology studies reveal that marine amorphous organic matter is predominant, and no significant differences were observed between Khabour and Akkas samples in terms of organic-matter type. Molecular geochemical data also indicate that the kerogen of the two formations is of similar origin. The normal alkane distribution is unimodal, with a maximum at $${\mathrm{C}}_{16}\mbox{--}{\mathrm{C}}_{18}$$ , indicating marine algal organic matter. Rock-Eval $${T}_{\mathrm{max}}$$ and biomarker data indicate that the organic matter of the black shales of the lower part of the Akkas Formation is early mature, whereas the Khabour Formation is highly mature in the Akkas field.
    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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    Palaeoecological evolution of Duckmantian wetlands in the Ruhr Basin (western Germany): A palynological and coal petrographical analysis (2010)
    Elsevier
    Details
    Publication Date: 2010-09-01
    Print ISSN: 0034-6667
    Electronic ISSN: 1879-0615
    Topics: Geosciences
    Published by Elsevier
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  • 6
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    Gas saturation and CO2 enhancement potential of coalbed methane reservoirs as a function of depth (2014)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2014-02-03
    Description: The influence of moisture, temperature, coal rank, and differential enthalpy on the methane (CH 4 ) and carbon dioxide (CO 2 ) sorption capacity of coals of different rank has been investigated by using high-pressure sorption isotherms at 303, 318, and 333 K (CH 4 ) and 318, 333, and 348 K (CO 2 ), respectively. The variation of sorption capacity was studied as a function of burial depth of coal seams using the corresponding Langmuir parameters in combination with a geothermal gradient of 0.03 K/m and a normal hydrostatic pressure gradient. Taking the gas content corresponding to 100% gas saturation at maximum burial depth as a reference value, the theoretical CH 4 saturation after the uplift of the coal seam was computed as a function of depth. According to these calculations, the change in sorption capacity caused by changing pressure, temperature conditions during uplift will lead consistently to high saturation values. Therefore, the commonly observed undersaturation of coal seams is most likely related to dismigration (losses into adjacent formations and atmosphere). Finally, we attempt to identify sweet spots for CO 2 -enhanced coalbed methane (CO 2 -ECBM) production. The CO 2 -ECBM is expected to become less effective with increasing depth because the CO 2 -to-CH 4 sorption capacity ratio decreases with increasing temperature and pressure. Furthermore, CO 2 -ECBM efficiency will decrease with increasing maturity because of the highest sorption capacity ratio and affinity difference between CO 2 and CH 4 for low mature coals.
    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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    Hydrocarbon charge assessment of frontier basins – a case study of the oceanic crust of the Moroccan Atlantic margin (2018)
    Geological Society of London
    Details
    Publication Date: 2018
    Description: 〈span〉〈div〉Abstract〈/div〉A string of prominent structural anticlines is located in the deep offshore Atlantic Ocean 〈span〉c.〈/span〉 150 km west of Essaouira (Morocco), possibly forming large traps. However, the basement is inferred to comprise oceanic crust, which raises concerns for source-rock presence and sufficient subsurface temperatures for oil generation. The presented work showcases a hydrocarbon charge assessment approach adapted to the very sparse data context and the specific geodynamic settings of the Moroccan Atlantic margin. Regional 2D basin and petroleum systems modelling was performed to assess possible scenarios of hydrocarbon charge of the deep-water folds, its migration style and timing. Several possible oil and gas generation drivers have been identified for postulated Toarcian marine shale source rocks. These range from simple burial-driven heating to more unique scenarios involving early stage oceanic ridge heating and the effect of the Canary Island hotspot. In particular, the latter might have had a major impact on the oil and gas generation, the migration style and overall accumulated amounts.〈strong〉Supplementary material:〈/strong〉 A table with lithology parameters used for modelling, an overview table of modelling cases and annex figures with additional results from modelling cases are available at 〈a href="https://doi.org/10.6084/m9.figshare.c.4183106"〉https://doi.org/10.6084/m9.figshare.c.4183106〈/a〉〈/span〉
    Print ISSN: 1354-0793
    Electronic ISSN: 2041-496X
    Topics: Geosciences
    Published by Geological Society of London
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  • 8
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    The Posidonia Shale of northern Germany: unconventional oil and gas potential from high-resolution 3D numerical basin modelling of the cross-junction between the eastern Lower Saxony Basin, Pompeckj Block and Gifhorn Trough (2018)
    Geological Society (of London)
    Details
    Publication Date: 2018-04-07
    Description: A high-resolution three-dimensional (3D) numerical basin model, incorporating the eastern part of the Lower Saxony Basin (LSB), the Gifhorn Trough and parts of the southern Pompeckj Block, was built to reconstruct the thermal and structural evolution of this area. The estimation and calculation of the unconventional oil and gas resource density within the Posidonia Shale source-rock unit was the main objective of this study. Incorporating organic–geochemical data for the Posidonia Shale source-rock units, such as compositional petroleum generation kinetics data, allowed a more accurate prediction of hydrocarbon potential compared to large-scale models of the area, as well as a better prediction of bulk adsorption capacity and adsorbed gas content. For the accurate calculation of oil and gas contents within the source-rock lithologies, mineralogy and physical properties of the rocks, such as compressibility, sorption capacity and porosity, are important as well as organic matter quantity, quality and thermal maturity. These properties in turn are strongly dependent on the vastly different burial/uplift histories within the LSB, Gifhorn Trough and the Pompeckj Block. The Gifhorn Trough, large parts of the Pompeckj Block and the flanks of the LSB are interesting concerning the unconventional oil potential, with current source-rock maturities between 0.65% and 1.2% vitrinite reflectance. Central parts of the LSB and small parts of the Pompeckj Block show inherent unconventional gas potential. Methane adsorption capacity is influenced by the burial/uplift history of the basin, which stresses the importance of structural and geochemical interlocking in understanding unconventional hydrocarbon systems.
    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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    Integrated charge and seal assessment in the Monagas fold and thrust belt of Venezuela (2014)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2014-06-27
    Description: Conventional basin and petroleum systems modeling uses the vertical backstripping approach to describe the structural evolution of a basin. In structurally complex regions, this is not sufficient. If lateral rock movement and faulting are inputs, the basin and petroleum systems modeling should be performed using structurally restored models. This requires a specific methodology to simulate rock stress, pore pressure, and compaction, followed by the modeling of the thermal history and the petroleum systems. We demonstrate the strength of this approach in a case study from the Monagas fold and thrust belt (Eastern Venezuela Basin). The different petroleum systems have been evaluated through geologic time within a pressure and temperature framework. Particular emphasis has been given to investigating structural dependencies of the petroleum systems such as the relationship between thrusting and hydrocarbon generation, dynamic structure-related migration pathways, and the general impact of deformation. We also focus on seal integrity through geologic time by using two independent methods: forward rock stress simulation and fault activity analysis. We describe the uncertainty that is introduced by replacing backstripped paleogeometry with structural restoration, and discuss decompaction adequacy. We have built two end-member scenarios using structural restoration, one assuming hydrostatic decompaction, and one neglecting it. We have quantified the impact through geologic time of both scenarios by analyzing important parameters such as rock matrix mass balance, source rock burial depth, temperature, and transformation ratio.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
    Published by American Association of Petroleum Geologists (AAPG)
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  • 10
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    The impact of Quaternary glaciation on temperature and pore pressure in Jurassic troughs in the Southern Permian Basin, northern Germany (2018)
    Geological Society (of London)
    Details
    Publication Date: 2018-01-18
    Description: A detailed 3D petroleum system model was constructed for the Schleswig-Holstein area in northern Germany. Salt movement and the Quaternary ice episodes were implemented in order to reconstruct their impact on temperature, maturity and pressure. Burial, temperature and maturity histories were calculated for the Jurassic troughs and the Glueckstadt Graben showing both differences and similarities. For example, all locations reached (almost) deepest burial at present day, whilst subsidence and long-term sedimentation rate was highest in Glueckstadt Graben during the Triassic. The Jurassic troughs received their major subsidence and sedimentation pulse later, and were strongly affected by a later salt movement. The implementation of Quaternary glacial episodes does not have a strong impact on petroleum generation from the major source rock (Lower Toarcian Posidonia Shale). In the case of the Posidonia Shale reaching the stage of petroleum expulsion (outside of the study area), the effect of ‘glacial pumping’ (i.e. the development of high pore pressures during glaciation followed by expulsion and subsequent pressure release during deglaciation) can be deduced from the model. Petroleum accumulations in the reservoir layers (Dogger sandstones) are also seen to have been affected. This finding is of interest for exploration, as it might control petroleum composition, biodegradation and leakage through cap rocks.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society (of London)
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