Geothermie Neubrandenburg GmbH GTN

Neubrandenburg, Germany

Geothermie Neubrandenburg GmbH GTN

Neubrandenburg, Germany
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Budach I.,Geothermie Neubrandenburg GmbH GTN | Moeck I.,Leibniz Institute for Applied Geophysics | Luschen E.,Leibniz Institute for Applied Geophysics | Wolfgramm M.,Geothermie Neubrandenburg GmbH GTN
International Journal of Earth Sciences | Year: 2017

The structural evolution of faults in foreland basins is linked to a complex basin history ranging from extension to contraction and inversion tectonics. Faults in the Upper Jurassic of the German Molasse Basin, a Cenozoic Alpine foreland basin, play a significant role for geothermal exploration and are therefore imaged, interpreted and studied by 3D seismic reflection data. Beyond this applied aspect, the analysis of these seismic data help to better understand the temporal evolution of faults and respective stress fields. In 2009, a 27 km2 3D seismic reflection survey was conducted around the Unterhaching Gt 2 well, south of Munich. The main focus of this study is an in-depth analysis of a prominent v-shaped fault block structure located at the center of the 3D seismic survey. Two methods were used to study the periodic fault activity and its relative age of the detected faults: (1) horizon flattening and (2) analysis of incremental fault throws. Slip and dilation tendency analyses were conducted afterwards to determine the stresses resolved on the faults in the current stress field. Two possible kinematic models explain the structural evolution: One model assumes a left-lateral strike slip fault in a transpressional regime resulting in a positive flower structure. The other model incorporates crossing conjugate normal faults within a transtensional regime. The interpreted successive fault formation prefers the latter model. The episodic fault activity may enhance fault zone permeability hence reservoir productivity implying that the analysis of periodically active faults represents an important part in successfully targeting geothermal wells. © 2017 The Author(s)

Agency: European Commission | Branch: H2020 | Program: IA | Phase: LCE-03-2015 | Award Amount: 25.07M | Year: 2016

DESTRESS is aimed at creating EGS (Enhanced geothermal systems) reservoirs with sufficient permeability, fracture orientation and spacing for economic use of underground heat. The concepts are based on experience in previous projects, on scientific progress and developments in other fields, mainly the oil & gas sector. Recently developed stimulation methods will be adapted to geothermal needs, applied to new geothermal sites and prepared for the market uptake. Understanding of risks in each area (whether technological, in business processes, for particular business cases, or otherwise), risk ownership, and possible risk mitigation will be the scope of specific work packages. The DESTRESS concept takes into account the common and specific issues of different sites, representative for large parts of Europe, and will provide a generally applicable workflow for productivity enhancement measures. The main focus will be on stimulation treatments with minimized environmental hazard (soft stimulation), to enhance the reservoir in several geological settings covering granites, sandstones, and other rock types. The business cases will be shown with cost and benefit estimations based on the proven changes of the system performance, and the environmental footprint of treatments and operation of the site will be controlled. In particular, the public debate related to fracking will be addressed by applying specific concepts for the mitigation of damaging seismic effects while constructing a productive reservoir and operating a long-term sustainable system. Industrial participation is particularly pronounced in DESTRESS, including large energy suppliers as well as SMEs in the process of developing their sites. The composition of the consortium involving major knowledge institutes as well as key industry will guarantee the increase in technology performance of EGS as well as an accelerated time to market.

PubMed | Geothermie Neubrandenburg GmbH GTN, BWG Geochemische Beratung GmbH and German Research Center for Geosciences
Type: Journal Article | Journal: Applied microbiology and biotechnology | Year: 2016

The microbial biocenosis in highly saline fluids produced from the cold well of a deep geothermal heat store located in the North German Basin was characterized during regular plant operation and immediately after plant downtime phases. Genetic fingerprinting revealed the dominance of sulfate-reducing bacteria (SRB) and fermentative Halanaerobiaceae during regular plant operation, whereas after shutdown phases, sequences of sulfur-oxidizing bacteria (SOB) were also detected. The detection of SOB indicated oxygen ingress into the well during the downtime phase. High 16S ribosomal RNA (rRNA) and dsrA gene copy numbers at the beginning of the restart process showed an enrichment of bacteria, SRB, and SOB during stagnant conditions consistent with higher concentrations of dissolved organic carbon (DOC), sulfate, and hydrogen sulfide in the produced fluids. The interaction of SRB and SOB during plant downtimes might have enhanced the corrosion processes occurring in the well. It was shown that scale content of fluids was significantly increased after stagnant phases. Moreover, the sulfur isotopic signature of the mineral scales indicated microbial influence on scale formation.

Franz M.,TU Bergakademie Freiberg | Nowak K.,Geothermie Neubrandenburg GmbH GTN | Berner U.,BRG | Berner U.,Statoil | And 4 more authors.
Global and Planetary Change | Year: 2014

The deposition of the Stuttgart Formation ('Schilfsandstein'), commonly considered as a type-example of the Carnian Pluvial Event, was controlled by high frequent 4th order sequences that resulted in pre-, intra- and post-Schilfsandstein transgressions from Tethyan waters into the epicontinental Central European Basin (CEB). The pre-Schilfsandstein transgression flooded the CEB trough gates to the Southeast and resulted in a wide-spread inland sea that was characterised by increased biological productivity, predominantly oxic conditions and enabled the immigration of euryhaline marine fauna with plankton, ostracodes, fishes, bivalves and the gastropods Omphaloptychia suebica n. sp. and Settsassia stuttgartica n. sp. The rather short-term intra- and post-Schilfsandstein transgressions flooded the CEB from the Southwest and Southeast and established a shallow brackish inland sea that stretched up to North Germany. Both, the 4th and 3rd order sequences derived from the succession in the CEB correlate well with those derived from successions of Tethyan shelfs. Therefore pronounced circum-Tethyan eustatic cycles are evidenced and may have had considerable impact on prominent middle Carnian events: Reingraben turnover, Carnian Pluvial Event, Carnian Crisis and Mid Carnian Wet Intermezzo. The broad circum-Tethyan evidence of 106-year scale cycles suggests glacioeustatic sea-level changes even in the Triassic Greenhouse period. © 2014 Elsevier B.V.

Lerm S.,Helmholtz Center Potsdam | Alawi M.,Helmholtz Center Potsdam | Miethling-Graff R.,Johann Heinrich Von Thunen Institute | Wolfgramm M.,Geothermie Neubrandenburg GmbH GTN | And 3 more authors.
Grundwasser | Year: 2011

In this study, the operation of a cold store, located in 30-60 m depth in the North German Basin, was investigated by direct counting of bacteria and genetic fingerprinting analysis. Quantification of microbes accounted for 1 to 10·105 cells per ml fluid with minor differences in the microbial community composition between well and process fluids. The detected microorganisms belong to versatile phyla Proteobacteria and Flavobacteria. In addition to routine plant operation, a phase of plant malfunction caused by filter clogging was monitored. Increased abundance of sulfur-oxidizing bacteria indicated a change in the supply of electron acceptors, however, no changes in the availability of electron acceptors like nitrate or oxygen were detected. Sulfur- and iron-oxidizing bacteria played essential roles for the filter lifetimes at the topside facility and the injectivity of the wells due to the formation of biofilms and induced mineral precipitations. In particular, sulfur-oxidizing Thiothrix generated filamentous biofilms were involved in the filter clogging. © 2011 Springer-Verlag.

Alawi M.,Helmholtz Center Potsdam | Lerm S.,Helmholtz Center Potsdam | Vetter A.,Helmholtz Center Potsdam | Wolfgramm M.,Geothermie Neubrandenburg GmbH GTN | And 2 more authors.
Grundwasser | Year: 2011

Enhanced process understanding of engineered geothermal systems is a prerequisite to optimize plant reliability and economy. We investigated microbial, geochemical and mineralogical aspects of a geothermal groundwater system located in the Molasse Basin by fluid analysis. Fluids are characterized by temperatures ranging from 61°C to 103°C, salinities from 600 to 900 mg/l and a dissolved organic carbon content (DOC) between 6.4 to 19.3 mg C/l. The microbial population of fluid samples was analyzed by genetic fingerprinting techniques based on PCR-amplified 16S rRNA- and dissimilatory sulfite reductase genes. Despite of the high temperatures, microbes were detected in all investigated fluids. Fingerprinting and DNA sequencing enabled a correlation to metabolic classes and biogeochemical processes. The analysis revealed a broad diversity of sulfate-reducing bacteria. Overall, the detection of microbes known to be involved in biocorrosion and mineral precipitation indicates that microorganisms could play an important role for the understanding of processes in engineered geothermal systems. © 2011 Springer-Verlag.

Zimmermann J.,TU Bergakademie Freiberg | Franz M.,TU Bergakademie Freiberg | Wolfgramm M.,Geothermie Neubrandenburg GmbH GTN
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2014

The Late Aalenian (earliest Middle Jurassic) Polyplocussandstein Formation in the vicinity of Wolfsburg (SE Lower Saxony, Germany) was deposited on the progradational lower delta plain of a large fluvial-dominated delta system. Detailed lithofacies analyses on several outcrops point to five associations of eight lithofacies types: i) point bar sheets, ii) chute channels, iii) natural levees, iv) crevasse splay sheet sandstones and v) interdistributary bays and, combined with published well data, enable a more detailed palaeogeographic reconstruction than previously available. Palaeohydraulic analysis on lateral shifting point bar sheets of a subsidiary distributary channel enable the reconstruction of an up to 45 m wide and 4 m deep meandering channel of high sinuosity (P 1.8) and mean transport direction towards 298. The meander belt was at maximum 350 m wide (Wm) and characterised by an annual discharge of up to 17 m/s (Qm) and mean flood discharge of up to 210 m/s (Qma). Discharge varied only slightly between stages of bankfull and low depth but resulted locally in crevassing of natural levees and formation of crevasse splays. Crevasse splays were transported towards northwestern and northeastern direction and are characterised by tabular sand sheets of aggradational architecture. Their propagation is indicated by downstream accreting cross-bedded bedforms and their termination by down-current directed thinning and rapid facies transitions to clayey lithologies of interdistributary bays. However, dark clays of interdistributary bays are slightly enriched in organic carbon but redox indices (Ni/Co, U/Th) indicate deposition under oxic conditions.©2014 E. Schweizerbartsche Verlagsbuchhandlung, Stuttgart, Germany.

Lerm S.,Helmholtz Center Potsdam | Westphal A.,Helmholtz Center Potsdam | Miethling-Graff R.,Helmholtz Center Potsdam | Alawi M.,Helmholtz Center Potsdam | And 3 more authors.
Extremophiles | Year: 2013

The microbial diversity of a deep saline aquifer used for geothermal heat storage in the North German Basin was investigated. Genetic fingerprinting analyses revealed distinct microbial communities in fluids produced from the cold and warm side of the aquifer. Direct cell counting and quantification of 16S rRNA genes and dissimilatory sulfite reductase (dsrA) genes by real-time PCR proved different population sizes in fluids, showing higher abundance of bacteria and sulfate reducing bacteria (SRB) in cold fluids compared with warm fluids. The operation-dependent temperature increase at the warm well probably enhanced organic matter availability, favoring the growth of fermentative bacteria and SRB in the topside facility after the reduction of fluid temperature. In the cold well, SRB predominated and probably accounted for corrosion damage to the submersible well pump and iron sulfide precipitates in the near wellbore area and topside facility filters. This corresponded to lower sulfate content in fluids produced from the cold well as well as higher content of hydrogen gas that was probably released from corrosion, and maybe favored growth of hydrogenotrophic SRB. This study reflects the high influence of microbial populations for geothermal plant operation, because microbiologically induced precipitative and corrosive processes adversely affect plant reliability. © 2013 Springer Japan.

Vetter A.,Helmholtz Center Potsdam | Mangelsdorf K.,Helmholtz Center Potsdam | Schettler G.,Helmholtz Center Potsdam | Seibt A.,BWG Geochemische Beratung GbR | And 3 more authors.
Organic Geochemistry | Year: 2012

The efficient use of energy is an important issue of public interest. In the Neubrandenburg heat storage surplus heat from a gas and steam cogeneration plant is stored in an aquifer system for use of the stored energy during times of high heat demand. The reliability of such a plant can strongly be influenced by microbial communities. Therefore, biogeochemical monitoring of the heat storage of Neubrandenburg was conducted from March 2006 to January 2010 to characterize the natural variability of prokaryotic life by way of phospholipid fatty acid (PLFA) analysis and the availability of electron acceptors (e.g. sulfate) and donors [e.g. dissolved organic carbon (DOC)] under different operating modes of the plant. Analysis of the fluid chemistry showed that a sufficient amount of electron acceptors (sulfate ca 1. g/l) and donors (DOC up to 19. mg/l) for potential microbial respiration and energy consumption is present. Phospholipid analysis of filter samples from the heat storage revealed a viable microbial community in the plant with adaptation to changes in the operating mode (charge/discharge) and associated variation in temperature (45-73. °C). The PLFAs mainly influenced were saturated and branched FAs, most likely reflecting temperature adaptation by a variable microbial community in different parts of the heat storage. Furthermore, branched monoenoic FAs indicated the presence of sulfate-reducing bacteria within the plant. © 2012 Elsevier Ltd.

Vetter A.,Helmholtz Center Potsdam | Mangelsdorf K.,Helmholtz Center Potsdam | Wolfgramm M.,Geothermie Neubrandenburg GmbH GTN | Rauppach K.,Geothermie Neubrandenburg GmbH GTN | And 2 more authors.
Applied Geochemistry | Year: 2012

In order to monitor the operating mode of the cold storage of the German Parliament (North German Basin) the fluid chemistry and the phospholipid fatty acid (PLFA) composition of the indigenous microbial community have been monitored from August 2006 to August 2009. During this time two periods of reduced injection (clogging events) characterized by Fe precipitates and microbial biofilms in filters occurred in the injection wells impairing the operating state of the investigated cold storage. The fluid monitoring revealed the presence of sufficient amounts of potential C and energy sources (e.g. DOC and SO 4 2-) in the process water to sustain microbial life in the cold storage. In times of reduced injection the PLFA inventory of the microbial community differs significantly from times of normal operating phases indicating compositional changes in the indigenous microbial ecosystem. The most affected fatty acids (FAs) are 16:1ω7c (increase), 16:1ω7t (decrease) and 18:1ω7c (increase), interpreted to originate mainly from Fe and S oxidizers, as well as branched FA with 15, 16 and 17 C atoms (decrease) most likely representing sulfate-reducing bacteria (SRB). Based on this variability, PLFA ratios have been created to reflect the increasing dominance of biofilm forming S and Fe oxidizers during the disturbance periods. These ratios are potential diagnostic tools to assess the microbiological contribution to the clogging events and to find appropriate counteractive measures (e.g. mechanical cleaning vs disinfection). The correlation between changes in the PLFA composition and the operational state suggests that microbially mediated processes play a significant role in the observed clogging events in the investigated cold storage. © 2012 Elsevier Ltd.

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