The Ketzin pilot site, led by the GFZ German Research Centre for Geosciences, is Europe's longest-operating on-shore CO2 storage site with aim of increasing understanding geological in saline aquifers. Located near Berlin, an situ laboratory anticlinal structure Northeast Basin. Starting research within framework EU project CO2SINK 2004, Germany's first and fully use since injection began June 2008. After 39 months operation, about 53,000 tonnes have been stored 630–650 m deep sandstone...

Underground coal gasification (UCG) allows for the utilization of reserves not exploitable due to unfavorable geology and economic boundary conditions. The present study examines underground economics converting deep-situated coals into a high-calorific UCG synthesis gas. Utilizing gas fuel combined cycle turbine (CCGT) considering CO2 capture its subsequent storage (CCS) in voids resulting from consumption, coupled process offers an low carbon option fired power generation area Bulgaria....

At Ketzin, located west of Berlin, the GFZ German Research Centre for Geosciences operates Europe's longest- running on-shore CO2 storage site. The Ketzin pilot site has been developed since 2004 and comprises three wells to depths 750 m 800 one shallow observation well, an injection facility permanently installed monitoring devices. Since June 2008, is injected into 630 650 deep sandstone units (Upper Triassic Stuttgart Formation) in anticlinal structure Northeast Basin. Until mid May 2012,...

Numerical simulations of CO2 migration for the period June 2008–December 2011 were performed based on a unique data set including recently revised static geological 3D model reservoir formation Ketzin pilot site in Brandenburg, Germany. We applied industrial standard ECLIPSE 100 and scientific TOUGH2-MP simulators this task implemented workflow to allow integration complex geometries from Petrel software package into TOUGH2-MP. Definition near- far-field well area allowed us apply suitable...

A coupled thermo-mechanical model has been developed to assess permeability changes in the vicinity of an underground coal gasification (UCG) reactor resulting from excavation and effects. Thereto, we consider a stepwise UCG based on pre-defined consumption rate dynamic thermal boundary conditions. Simulation results demonstrate that rock behavior is mainly driven by expansion coefficient, conductivity, tensile strength elastic modulus surrounding rock. comparison between...

This study examines the socio-technical challenges and public acceptance of hybrid pumped-hydropower storage (HPHS) technology within broader context energy transition in two European coal-mining regions: Western Macedonia, Greece, Łódzkie Region, Poland. These regions, deeply rooted lignite mining, face profound socio-economic transformations driven by EU Green Deal its commitment to achieving net-zero emissions 2050. The from coal dependency renewable represents not only a critical...

The need for the modelling framework is based on being able to make a statement as whether operation of Pumped Hydropower Storage (PHS) facility in former open-pit lignite mine can have negative impact water quality lower reservoir and associated aquifers. research question arises since flooded mines are often with acidification and/or increased sulphate metal concentrations [1-2]. Thus, software package allows geochemical processes during PHS mines.A new has been set-up [3]: reaction path...

GEOMODELATOR is a Python-based Open Source software package for translation of static geologic models into regular structured simulation grids considering element partitioning by complex model geometries (Nakaten, 2024; Nakaten and Kempka, 2023). In view the vast legacy data available from hydrocarbon exploration, it provides basis site-specific assessments subsurface utilisation in terms risk assessments, as well operational design optimisation.We have further developed to fit modular...

Large-scale methane releases from geological hydrocarbon seepage and the dissociation of subseafloor gas hydrates under shallow waters are important drivers atmospheric concentration increases global warming. However, processes, timescales, fluxes involved in such emissions remain insufficiently constrained. In this study, we redeploy historic oil industry datasets—including well logs, seismic data, as reservoir temperature pressure data—to reveal reservoir-scale leakage,...

Waiwera is a small coastal village with 50 °C warm geothermal reservoir of 400 metres thickness directly underneath [1-2]. Hydrogeological models support water management by providing insights into sustainable extraction from the reservoir. We analysed system in several studies over past decades, mainly last ten years [3-12].Geothermal waters at originate rainwater percolating downward and heating background gradient. The fed along fault zone located base New radiocarbon...

Pore pressure variation resulting from geological CO2 storage may compromise reservoir, caprock and fault integrity. Therefore, we investigate the mechanical impact of industrial-scale at a prospective Danish site by coupled 3D hydro-mechanical simulations carried out two independent modelling groups. Even though chosen strategies are not identical, simulation results demonstrate that integrity is maintained any time. Vertical displacements mainly determined hydraulic conductivity...

To assess the long-term reservoir stabilisation at Ketzin pilot site (Germany), contribution of four CO2 trapping mechanisms (structural, residual, dissolution and mineralisation trapping) was determined by numerical modelling. In first step, dynamic flow simulations were undertaken using a simulator. The second step comprised batch applying geochemical Coupling between both simulators achieved time-step dependent integration water saturation calculated in simulations. After simulation time...

Demonstrating conformity between observed and simulated plume behaviour is one of the main high-level requirements, which have to be fulfilled by an operator a CO2 storage site in order assure safe operations able transfer liability public after closure. The derived from geophysical and/or geochemical monitoring. Repeated 3D seismic observations proven provide most comprehensive image various projects such as Sleipner, Weyburn, or Ketzin. reservoir simulation using model calibrated with...

Power-to-gas (PtG) stores chemical energy by converting excess electrical from renewable sources into an energy-dense gas. Due to its higher available capacity compared surface-based storage technologies, subsurface in geological systems is the most promising approach for efficient and economic realization of PtG system's component. For this purpose, methane (CH4) produced methanation means hydrogen (H2) carbon dioxide (CO2) stored a reservoir until required further use. In context, CO2 used...

This paper presents a series of surface experimental simulations methane-oriented underground coal gasification using hydrogen as medium. The main aim the experiments conducted was to evaluate feasibility methane-rich gas production through in situ hydrogasification process. Two multi-day trials were carried out large scale facilities designed for ex (UCG) different coals investigated: "Six Feet" semi-anthracite (Wales) and "Wesoła" hard (Poland). samples extracted directly from respective...

Planned decommissioning of coal-fired plants in Europe requires innovative technical and economic strategies to support coal regions on their path towards a climate-resilient future. The repurposing open pit mines into hybrid pumped hydro power storage (HPHS) excess energy from the electric grid, renewable sources will contribute EU Green Deal, increase value, stabilize regional job market supply security. This study aims present preliminary phase geospatial workflow used evaluate land...

Deep un-mineable coal deposits are viable reservoirs for permanent and safe storage of carbon dioxide (CO2) due to their ability adsorb large amounts CO2 in the microporous structure. A reduced amount released into atmosphere contributes turn mitigation climate change. However, there a number geomechanical risks associated with commercial-scale CO2, such as potential fault or fracture reactivation, microseismic events, cap rock integrity ground surface uplift. The present study assesses...