A5040810269- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- CO2 Sequestration and Geologic Interactions
- Atmospheric and Environmental Gas Dynamics
- Spacecraft and Cryogenic Technologies
- Hydraulic Fracturing and Reservoir Analysis
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Advanced Computational Techniques and Applications
- Geochemistry and Geologic Mapping
- Coal Properties and Utilization
- Chemical Looping and Thermochemical Processes
- Arctic and Antarctic ice dynamics
- Diet, Metabolism, and Disease
- Data Quality and Management
- Semantic Web and Ontologies
- Advanced Database Systems and Queries
- Iron and Steelmaking Processes
- Catalysts for Methane Reforming
- Marine and environmental studies
- Climate change and permafrost
- Quantum, superfluid, helium dynamics
- Offshore Engineering and Technologies
GFZ Helmholtz Centre for Geosciences
2014-2024
Since huge amounts of CH4 are bound in natural gas hydrates occurring at active and passive continental margins permafrost regions, the production from hydrate-bearing sediments has become more interest. Three different methods to destabilize release discussed principle: thermal stimulation, depressurization chemical stimulation. This study focusses on stimulation using a counter-current heat-exchange reactor for situ combustion CH4. The principle as method hydrate bearing been introduced...
Natural gas hydrates are ice-like solids occurring worldwide on continental margins and in permafrost regions. Their high methane (CH4) content makes them a potential energy source, but also climate factor. Pressure temperature changes their environment may induce the decomposition of hydrates. Some hydrates, however, exhibit so-called self-preservation effect which delays process is not yet sufficiently understood. In present work, behavior simple mixed sI sII was studied via experiments (T...
In this study we present results of our investigations on simple CH4-hydrate and mixed hydrates during the initial steps hydrate formation process. situ Raman spectroscopy, microscopic observation in X-ray diffraction were used systematic studies. Although these techniques give only a limited view molecular level combined from experiments reported here indicate that labile cluster hypothesis can describe Specifically, guest molecules dissolve aqueous phase before they are encaged into single...
Abstract In 2012 the production of CH 4 from hydrate‐bearing sediments via CO 2 injection was conducted in framework Iġnik Sikumi Field Trial Alaska, USA. order to preserve injectivity by avoiding a formation hydrate near‐well region, mixture containing 77 mol% N and 23 chosen. The interpretation complex test results difficult, nature interaction between ‐CO initial could not be clarified. this study we present our experimental investigations simulating at different scales. We (1) situ Raman...
A study of methane hydrate dissociation under different temperature and pressure conditions combining in situ ex Raman spectroscopic measurements, confocal microscopic characterizations, powder X-ray diffraction molecular dynamics simulations was conducted. Both the experimental simulated data show that a distinction must be made between behavior above below freezing point water. During process at temperatures near or water, simple CH4 hydrates showed well-known self-preservation behaviors....
In this study we assess the present-day gas hydrate stability zone for Barents Sea and Kara region. Thereby, make use of a data-based 3D lithosphere-scale pressure thermal model. The resulting varies within >1km across area strongly correlates with local geological settings corresponding geothermal gradient. Gas hydrates containing hydrocarbons from thermogenic source (CH4+C2H3+C3H8) are potentially more widespread than previously assumed. feed may have derived leaking petroleum systems...
The "guest exchange" of methane (CH4) by carbon dioxide (CO2) in naturally occurring gas hydrates is seen as a possibility to concurrently produce CH4 and sequester CO2. Presently, process evaluation based on CH4–CO2 exchange yields small- or medium-scale laboratory experiments, mostly neglecting mass heat transfer processes. This work investigates efficiencies two large-scale experiments (210 L sample volume) using fully water-saturated, natural reservoir conditions hydrate saturation 50%....
Natural gas hydrates are ice-like solids composed of and water molecules. They found worldwide at all continental margins as well in permafrost regions. Depending on the source enclathrated molecules, natural may occur coexisting phases with different structures containing predominantly CH4, but also a variety hydrocarbons, CO2 or H2S. For better understanding these complex hydrate formation processes micrometer level, an experimental setup new high-pressure cell was developed, which can be...
The global occurrences of natural gas hydrates lead to the conclusion that tremendous amounts hydrocarbons are bonded in these hydrate-bearing sediments, serving as a potential energy resource. For release hydrate-bonded CH4 from reservoirs, different production methods have been developed during last decades. Among them, chemical stimulation via injection CO2 is considered carbon neutral on basis assumption replaced by CO2. investigation replacement process with µm-scale, we performed...
Natural gas hydrates are non-stoichiometric, crystalline solids composed of water and molecules. Dependent upon the source hydrate-forming gas, structure composition occurring natural may vary. In nature, existence I, II, H containing predominantly methane but also other hydrocarbons, H2S, or CO2 could be verified. Interestingly, number reports on coexisting hydrate phases with different structures compositions in reservoirs has increased recent years. However, it not yet been clearly...
Global compilations of geo- and cosmochemical data are increasingly leveraged to address exciting new research questions through data-analytics machine-learning approaches. These invaluable datasets maintained made accessible as synthesis databases, such GEOROC PetDB catering terrestrial igneous metamorphic rocks; AstroMat Data Synthesis encompassing diverse astromaterial samples; GeoReM a comprehensive resource for geochemical, environmental biological reference materials. The databases...
Abstract At the GFZ German Research Centre for Geosciences we have developed a safe and efficient method which allows decomposition of gas hydrates by supply heat inside reservoir. The is generated in situ catalytic combustion methane counter-current heat-exchange reactor. reactor that Rudy Rogers, Professor Emeritus Chemical Engineering at Mississippi State University, referred to as "Schicks Combustor" placed borehole such way hot reaction zone situated area hydrate layer. generates via...