Temporal evolution of fault systems in the Upper Jurassic of the Central German Molasse Basin: case study Unterhaching

Budach, Ingmar; Moeck, Inga; Lüschen, E.; Wolfgramm, Markus

doi:10.1007/s00531-017-1518-1

Cited by 13 publications

(30 citation statements)

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“…Regarding the contemporary tectonic regime in the Bavarian Molasse Basin, older studies proposed that it is between strike-slip and thrust faulting (Illies and Greiner 1978;Lemcke 1988). More recent studies, however, favour normal faulting (Bachmann et al 1987;Drews et al 2018Drews et al , 2019Reinecker et al 2010), normal faulting to strike-slip (Budach et al 2017;Backers et al 2017) or strike-slip (Seithel et al 2015;Megies and Wassermann 2014).…”

Section: Geological Setting and Seismotectonics Of The Model Areamentioning

confidence: 99%

“…In Freiham and Geretsried (Backers et al 2017), Unterhaching (Budach et al 2017;Backers et al 2017), and Sauerlach (Seithel et al 2015), estimates on the magnitude of S Hmax and S hmin are available. Budach et al (2017) and Backers et al (2017) provide two completely different sets of stress magnitude data for either a strike-slip ( S Hmax > S v > S hmin ) or transtensional ( S Hmax = S v > S hmin , there called normal faulting) stress regime in Freiham, Geretsried, and Unterhaching. Due to the observed induced seismicity, Megies and Wassermann (2014), Budach et al (2017) and Backers et al (2017) prefer the strike-slip stress regime.…”

Section: Model Calibrationmentioning

confidence: 99%

“…Budach et al (2017) and Backers et al (2017) provide two completely different sets of stress magnitude data for either a strike-slip ( S Hmax > S v > S hmin ) or transtensional ( S Hmax = S v > S hmin , there called normal faulting) stress regime in Freiham, Geretsried, and Unterhaching. Due to the observed induced seismicity, Megies and Wassermann (2014), Budach et al (2017) and Backers et al (2017) prefer the strike-slip stress regime. In addition, the S hmin magnitude is constrained by two LOTs in Unterhaching (Drews et al 2019), a suspected LOT during an FIT in Sauerlach which is treated as an LOT (pers.…”

Section: Model Calibrationmentioning

confidence: 99%

“…In the Bavarian Molasse Basin, the stress regime is highly debated (Drews et al 2019;Reinecker et al 2010;Seithel et al 2015). Seithel et al (2015) assume a strike-slip stress regime but Budach et al (2017) and Backers et al (2017) provide magnitude estimations of S hmin and S Hmax for either a strike-slip or transtensional stress regime for three locations. The authors prefer a strike-slip tectonic regime due to the observed induced seismicity in the Molasse Basin of which the ones with focal mechanism solutions showed a strike-slip mechanism Wassermann 2014, 2017).…”

Section: Tectonic Stress Regimementioning

confidence: 99%

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The 3D stress state from geomechanical–numerical modelling and its uncertainties: a case study in the Bavarian Molasse Basin

Ziegler

Heidbach

2020

Geotherm Energy

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Knowledge of the undisturbed stress state is a key parameter for borehole stability, productivity and induced seismicity hazard assessment. Due to the sparse and incomplete availability of data records, 3D geomechanical–numerical modelling is applied to estimate the stress state in a volume. To assess the quality of the model results, the model uncertainties have to be quantified. We present an approach that provides the uncertainties of the six independent stress tensor components at each location in the model volume by an average value and its standard deviation. We explore the uncertainties introduced to the model results with respect to the stress magnitude data used for model calibration. We test our approach on a model of the Bavarian Molasse Basin which includes the area around Munich with many geothermal projects. In the test area, we find large uncertainties in the modelled magnitude of the maximum horizontal stress ($$\text{S}_\text {Hmax}$$SHmax) in the order of 15–30%. The uncertainties in the magnitude of the minimum horizontal stress ($$\text{S}_\text {hmin}$$Shmin) are smaller between 5 and 20%. In connection with an adequate failure criterion, we compare our model results to the seismological observations at two neighbouring geothermal projects. Whilst Aschheim/Feldkirchen/Kirchheim remained seismically quiet, induced seismicity was recorded in Poing. Our modelled undisturbed stress state was confirmed by these observations by showing in average a stable stress state in Aschheim/Feldkirchen/Kirchheim and a critical stress state in Poing. If the uncertainties in terms of two standard deviations are considered, this does not change. This demonstrates the increase in model significance when uncertainties are available.

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Section: Geological Setting and Seismotectonics Of The Model Areamentioning

confidence: 99%

Section: Model Calibrationmentioning

confidence: 99%

Section: Model Calibrationmentioning

confidence: 99%

Section: Tectonic Stress Regimementioning

confidence: 99%

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The 3D stress state from geomechanical–numerical modelling and its uncertainties: a case study in the Bavarian Molasse Basin

Ziegler

Heidbach

2020

Geotherm Energy

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“…Hitherto, the normal faults of the Upper Jurassic formations have been geometrically described as synand antithetic faults partly overprinted by wrench tectonics (Bachmann et al 1982, Bachmann et al 1987, Lüschen et al 2006 but their detailed tectono-genetic evolution is poorly understood (e.g. Budach et al 2017). Cacace et al (2013) mention the paradox of this normal fault-strike and dip because the faulting style does not reflect the present-day stress field, having possibly some effects on hydraulic properties.…”

Section: Introductionmentioning

confidence: 99%

Multiphase fossil normal faults as geothermal exploration targets in the Western Bavarian Molasse Basin: Case study Mauerstetten

Mraz¹,

Moeck²,

Bißmann³

et al. 2018

zdgg

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The Bavarian Molasse Basin represents a peripheral foreland basin hosting abundant hydrothermal resources in 3-5 km deep Upper Jurassic carbonate rocks. Faults and facies play a major role in targeting production wells; however the kinematic evolution of fault zones and the classification of carbonate facies of the Upper Jurassic are still debated. At the geothermal prospect Mauerstetten in the Western Bavarian Molasse Basin, a geothermal well and a side track are drilled along and about 650 m off an ENE-WSW striking normal fault. A stratigraphy related fault throw analysis of six 2D seismic sections crossing this fault evidences multiphase normal faulting from Cretaceous to Upper Miocene with a major activity phase in the Oligocene. This fault, inactive since Upper Miocene, is presumably a fossil normal fault in the present-day stress field that has a maximum horizontal stress direction in N-S. Analysis of carbonate facies by thin section petrography of drill cuttings and geophysical borehole logs lead to two major conclusions: (i) the reservoir rock represents low permeable platform limestones, reef detritus and dolostones of the Franconian facies, and (ii) the fault consists of multiple normal faulting steps with higher permeability than in intact rock. This observation suggests a fracture controlled reservoir with permeable damage zones in a tight rock mass along reactivated normal faults.

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Rock Mechanical Basics

Stockinger

2022

Fracturing in Deep Boreholes

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Temporal evolution of fault systems in the Upper Jurassic of the Central German Molasse Basin: case study Unterhaching

Abstract: 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.

Cited by 13 publications

References 33 publications

The 3D stress state from geomechanical–numerical modelling and its uncertainties: a case study in the Bavarian Molasse Basin

The 3D stress state from geomechanical–numerical modelling and its uncertainties: a case study in the Bavarian Molasse Basin

Multiphase fossil normal faults as geothermal exploration targets in the Western Bavarian Molasse Basin: Case study Mauerstetten

Rock Mechanical Basics

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