Lange, Torsten

[["dc.bibliographiccitation.firstpage","3839"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","ENVIRONMENTAL EARTH SCIENCES"],["dc.bibliographiccitation.lastpage","3853"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Lange, Torsten"],["dc.contributor.author","Sauter, Martin"],["dc.contributor.author","Heitfeld, Michael"],["dc.contributor.author","Schetelig, Kurt"],["dc.contributor.author","Brosig, Karolin"],["dc.contributor.author","Jahnke, Wiebke"],["dc.contributor.author","Kissinger, Alexander"],["dc.contributor.author","Helmig, Rainer"],["dc.contributor.author","Ebigbo, Anozie"],["dc.contributor.author","Class, Holger"],["dc.date.accessioned","2018-11-07T09:17:12Z"],["dc.date.available","2018-11-07T09:17:12Z"],["dc.date.issued","2013"],["dc.description.abstract","Hydraulic fracturing of unconventional gas reservoirs rapidly developed especially in the USA to an industrial scale during the last decade. Potential adverse effects such as the deterioration of the quality of exploitable groundwater resources, areal footprints, or even the climate impact were not assessed. Because hydraulic fracturing has already been practised for a long time also in conventional reservoirs, the expansion into the unconventional domain was considered to be just a minor but not a technological step, with potential environmental risks. Thus, safety and environmental protection regulations were not critically developed or refined. Consequently, virtually no baseline conditions were documented before on-site applications as proof of evidence for the net effect of environmental impacts. Not only growing concerns in the general public, but also in the administrations in Germany promoted the commissioning of several expert opinions, evaluating safety, potential risks, and footprints of the technology in focus. The first two publications of the workgroup \"Risks in the Geological System\" of the independent \"Information and Dialogue process on hydraulic fracturing\" (commissioned by ExxonMobil Production Deutschland GmbH) comprises the strategy and approaches to identify and assess the potential risks of groundwater contamination of the exploitable groundwater system in the context of hydraulic fracturing operations in the Munsterland cretaceous basin and the Lower Saxony Basin, Germany. While being specific with respect to local geology and the estimation of effective hydraulic parameters, generalized concepts for the contamination risk assessment were developed. The work focuses on barrier effectiveness of different units of the overburden with respect to the migration of fracking fluids and methane, and considers fault zones as potential fluid pathway structures."],["dc.identifier.doi","10.1007/s12665-013-2803-3"],["dc.identifier.isi","000327457600029"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28105"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1866-6299"],["dc.relation.issn","1866-6280"],["dc.title","Hydraulic fracturing in unconventional gas reservoirs: risks in the geological system part 1"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3"],["dc.bibliographiccitation.journal","International Journal of Greenhouse Gas Control"],["dc.bibliographiccitation.lastpage","23"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Niemi, Auli"],["dc.contributor.author","Bensabat, Jacob"],["dc.contributor.author","Shtivelman, Vladimir"],["dc.contributor.author","Edlmann, Katriona"],["dc.contributor.author","Gouze, Philippe"],["dc.contributor.author","Luquot, Linda"],["dc.contributor.author","Hingerl, Ferdinand"],["dc.contributor.author","Benson, Sally M."],["dc.contributor.author","Pezard, Philippe A."],["dc.contributor.author","Rasmusson, Kristina"],["dc.contributor.author","Liang, Tian"],["dc.contributor.author","Fagerlund, Fritjof"],["dc.contributor.author","Gendler, Michael"],["dc.contributor.author","Goldberg, Igor"],["dc.contributor.author","Tatomir, Alexandru"],["dc.contributor.author","Lange, Torsten"],["dc.contributor.author","Sauter, Martin"],["dc.contributor.author","Freifeld, Barry"],["dc.date.accessioned","2018-11-07T10:14:40Z"],["dc.date.available","2018-11-07T10:14:40Z"],["dc.date.issued","2016"],["dc.description.abstract","This paper provides an overview of the site characterization work at the Heletz site, in preparation to scientifically motivated CO2 injection experiments. The outcomes are geological and hydrogeological models with associated medium properties and baseline conditions. The work has consisted on first re-analyzing the existing data base from similar to 40 wells from the previous oil exploration studies, based on which a 3-dimensional structural model was constructed along with first estimates of the properties. The CO2 injection site is located on the saline edges of the Heletz depleted oil field. Two new deep (> 1600 m) wells were drilled within the injection site and from these wells a detailed characterization program was carried out, including coring, core analyses, fluid sampling, geophysical logging, seismic survey, in situ hydraulic testing and measurement of the baseline pressure and temperature. The results are presented and discussed in terms of characteristics of the reservoir and cap-rock, the mineralogy, water composition and other baseline conditions, porosity, permeability, capillary pressure and relative permeability. Special emphasis is given to petrophysical properties of the reservoir and the seal, such as comparing the estimates determined by different methods, looking at their geostatistical distributions as well as changes in them when exposed to CO2. (C) 2016 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.ijggc.2015.12.030"],["dc.identifier.isi","000378004200002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40662"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","1878-0148"],["dc.relation.issn","1750-5836"],["dc.title","Heletz experimental site overview, characterization and data analysis for CO2 injection and geological storage"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3855"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","ENVIRONMENTAL EARTH SCIENCES"],["dc.bibliographiccitation.lastpage","3873"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Kissinger, Alexander"],["dc.contributor.author","Helmig, Rainer"],["dc.contributor.author","Ebigbo, Anozie"],["dc.contributor.author","Class, Holger"],["dc.contributor.author","Lange, Torsten"],["dc.contributor.author","Sauter, Martin"],["dc.contributor.author","Heitfeld, Michael"],["dc.contributor.author","Kluenker, Johannes"],["dc.contributor.author","Jahnke, Wiebke"],["dc.date.accessioned","2018-11-07T09:17:12Z"],["dc.date.available","2018-11-07T09:17:12Z"],["dc.date.issued","2013"],["dc.description.abstract","Hydraulic fracturing is a method used for the production of unconventional gas resources. Huge amounts of so-called fracturing fluid (10,000-20,000 m(3)) are injected into a gas reservoir to create fractures in solid rock formations, upon which mobilised methane fills the pore space and the fracturing fluid is withdrawn. Hydraulic fracturing may pose a threat to groundwater resources if fracturing fluid or brine can migrate through fault zones into shallow aquifers. Diffuse methane emissions from the gas reservoir may not only contaminate shallow groundwater aquifers, but also escape into the atmosphere where methane acts as a greenhouse gas. The working group \"Risks in the Geological System\" as part of ExxonMobil's hydrofracking dialogue and information dissemination processes was tasked with the assessment of possible hazards posed by migrating fluids as a result of hydraulic fracturing activities. In this work, several flow paths for fracturing fluid, brine and methane are identified and scenarios are set up to qualitatively estimate under what circumstances these fluids would leak into shallower layers. The parametrisation for potential hydraulic fracturing sites in North Rhine-Westphalia and Lower Saxony (both in Germany) is derived from literature using upper and lower bounds of hydraulic parameters. The results show that a significant fluid migration is only possible if a combination of several conservative assumptions is met by a scenario."],["dc.identifier.doi","10.1007/s12665-013-2578-6"],["dc.identifier.isi","000327457600030"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28106"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1866-6299"],["dc.relation.issn","1866-6280"],["dc.title","Hydraulic fracturing in unconventional gas reservoirs: risks in the geological system, part 2"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]