Hydraulic fracturing in unconventional gas reservoirs: risks in the geological system part 1

Lange, Torsten; Sauter, Martin; Heitfeld, Michael; Schetelig, Kurt; Brosig, Karolin; Jahnke, Wiebke; Kissinger, Alexander; Helmig, Rainer; Ebigbo, Anozie; Class, Holger

doi:10.1007/s12665-013-2803-3

Cited by 57 publications

(38 citation statements)

References 18 publications

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“…The lack of relevant data, such as 3D seismic surveys and pre-fracking hydraulic drill-hole tests, contrasts with the wide scientific activity initiated by the Damme 3 pilot fracking test and following public debate (Sauter et al 2012;Andruleit et al 2012;Meiners et al 2012;Gordalla et al 2013;Hammes et al 2013;Hübner et al 2013;Kerschke and Schulz 2013;Lange et al 2013;Olsson et al 2013).…”

Section: Model Site Geology and Hydrogeologymentioning

confidence: 99%

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Schwartz

2014

Environ Earth Sci

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The hypothetical leakage of methane gas caused by fracking a 1,000-m deep Cretaceous claystone horizon at Damme, Germany, is simulated in a TOUGH-REACT reactive-transport model with 5,728 elements. A hypothetical leakage zone connects the Cretaceous horizon with a Quaternary potable-water aquifer (q1). Methane gas rises up to the q1 horizon in less than 2 days in all calculated scenarios. The simulations include the major constituents of groundwater as well as the seven most hazardous trace components that are natural constituents of groundwater (As, Cd, Cr, Ni, Pb, Se and U). The general trend is characterised by depletion of the natural hazardous components with decreasing acidity and oxygen fugacity in the relevant pH range (7-9). Nevertheless, the concentrations of elements whose dominant aqueous species are negatively charged in this pH range (Cr and Se) rise against the general trend due to desorption reactions. Slight enhancement effects are produced by the dissolution of contaminant-bearing oxides such as Cr-bearing goethite. In summary, the geological risks of a fracking operation are minor. The technical risks are more important. This is especially the case when rising methane gas gets into contact with fracking fluid that accidentally escapes through faulty well seals.

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Section: Model Site Geology and Hydrogeologymentioning

confidence: 99%

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Schwartz

2014

Environ Earth Sci

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“…Among the impacts, the issues concerning well integrity, handling and depositing hazardous materials such as the fracturing fluids, as well as the treatment of the flowback water are challenging, however, they are well regulated by the industry. One of the main public and scientific concerns is the contamination of shallow groundwater aquifers with fugitive hydrocarbon gases and HF fluids (King, 2012;Lange et al, 2013;Sauter et al, 2012;US EPA, 2013;Vengosh et al, 2014). The contaminants may migrate to shallow aquifers if hydraulically induced fractures intercept the vicinity of fault zones and leaky abandoned wells (Brownlow et al, 2016;Taherdangkoo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Conceptual model development using a generic Features, Events, and Processes (FEP) database for assessing the potential impact of hydraulic fracturing on groundwater aquifers

et al. 2018

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Abstract. Hydraulic fracturing for natural gas extraction from unconventional reservoirs has not only impacted the global energy landscape but has also raised concerns over its potential environmental impacts. The concept of "features, events and processes" (FEP) refers to identifying and selecting the most relevant factors for safety assessment studies. In the context of hydraulic fracturing we constructed a comprehensive FEP database and applied it to six key focused scenarios defined under the scope of FracRisk project (http://www.fracrisk.eu, last access: 17 August 2018). The FEP database is ranked to show the relevance of each item in the FEP list per scenario. The main goal of the work is to illustrate the FEP database applicability to develop a conceptual model for regional-scale stray gas migration.

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“…Lange et al (2013) and Kissinger et al (2013) address the issue of hydraulic fracturing in unconventional gas reservoirs in two parts with special focus on the risks in the geological system. The next paper by Gordalla et al (2013) is addressing the question whether hydraulic fracturing is a toxicological threat for groundwater, whereas Olsson et al (2013) present a view on the Environ Earth Sci (2013) 70:3427-3431 3429 composition, treatment and concerns related to hydraulic fracturing wastewater.…”

Section: Unconventional Reservoirs and Hydraulic Fracturingmentioning

confidence: 99%

Geoenergy: new concepts for utilization of geo-reservoirs as potential energy sources

et al. 2013

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Hydraulic fracturing in unconventional gas reservoirs: risks in the geological system part 1

Cited by 57 publications

References 18 publications

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Conceptual model development using a generic Features, Events, and Processes (FEP) database for assessing the potential impact of hydraulic fracturing on groundwater aquifers

Geoenergy: new concepts for utilization of geo-reservoirs as potential energy sources

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