Stress magnitudes across UK regions: New analysis and legacy data across potentially prospective unconventional resource areas

Fellgett, Mark; Kingdon, Andrew; Williams, John; Gent, C.

doi:10.1016/j.marpetgeo.2018.06.016

Cited by 14 publications

(11 citation statements)

References 27 publications

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“…Stephansson (1989) collected data from Fennoscandia in the Fennoscandian Rock Stress Data Base (FRSDB). Herget (1974) analysed stress data from Canada, Worotnicki and Denham (1976) data from Australia, Fellgett et al (2018) from the UK, and Brown and Hoek (1978) and Breckels and Van Eekelen (1982) compared data from different parts of the world. Another global stress magnitude database was published by Ranalli and Chandler (1975), who also gathered some specified values of principal horizontal stress magnitudes.…”

Section: Introductionmentioning

confidence: 99%

An open-access stress magnitude database for Germany and adjacent regions

Morawietz

Heidbach

Reiter³

et al. 2020

Geotherm Energy

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Knowledge of the crustal stress state is important for the assessment of subsurface stability. In particular, stress magnitudes are essential for the calibration of geomechanical models that estimate a continuous description of the 3-D stress field from pointwise and incomplete stress data. Well established is the World Stress Map Project, a global and publicly available database for stress orientations, but for stress magnitude data only local data collections are available. Herein, we present the first comprehensive and open-access stress magnitude database for Germany and adjacent regions, consisting of 568 data records. In addition, we introduce a quality ranking scheme for stress magnitude data for the first time.

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Section: Introductionmentioning

confidence: 99%

An open-access stress magnitude database for Germany and adjacent regions

Morawietz

Heidbach

Reiter³

et al. 2020

Geotherm Energy

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“…Cuss et al (2003) looked at the effects of porosity in sandstones on the mode of breakout formation whereas Nelson et al (2006) examined the occurrence of breakouts in cemented sandstone units in a sandstone-shale sequence. Occurrence of breakouts has also been linked to changes in the tectonic stress regime (Ask et al, 1996;Mariucci and Müller, 2003) although there is no evidence of any stress field inversions in the area shown in Figure 1 (Kingdon et al, 2016;Fellgett et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Lithological Constraints on Borehole Wall Failure; a Study on the Pennine Coal Measures of the United Kingdom

et al. 2019

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Stress-related borehole deformation features have been documented across the United Kingdom, most commonly as borehole breakouts and drilling induced tensile fractures (DIFs). Recent studies using borehole imaging have allowed more detailed investigation of these features and the processes that control their formation. Within the Pennsylvanian Pennine Coal Measures Group (PCM) of the United Kingdom borehole imaging has highlighted a disproportionately high number of breakouts occurring within paleosols located immediately below coal seams. To understand the processes controlling breakout formation, a 10.5 m section of core from the Melbourne 1 borehole, incorporating a typical coal seam / paleosol sequence, was analyzed using multiple techniques including: scanning electron and optical microscopy, X-Ray Fluorescence (XRF), X-ray radiography, Point Load testing, wireline petrophysics and track-based core scanning for physical properties. Strength measurements highlight that breakouts form preferentially in poorly consolidated sediments, with low tensile strength, cross-cut by listric surfaces. The formation and termination of breakouts also corresponds to zones of diagenetic iron mineral growth with a lower propensity to fail. These coincide with greater preservation of sedimentary structures and an increase in the rock's tensile strength; this intra-unit variation in tensile strength constrains breakout length. This demonstrates that secondary diagenetic processes, including the growth of iron minerals impose, lithological controls on the formation and length of borehole breakouts within the United Kingdom PCM.

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“…There are no published geomechanical analyses for the variation of stress with depth for either of these two areas. To constrain the depth dependence of stress, we have used larger scale syntheses of stress for onshore UK produced by the BGS (e.g., Kingdon et al, 2016;Fellgett et al, 2018). The stress-depth plot in Figure 15a has been constructed using the data shown in Fellgett et al (2018), and shows that, in general, a strike-slip fault regime with  =  Hmax is most likely.…”

Section: Coalfields In South Wales and Greater Manchester Ukmentioning

confidence: 99%

“…To constrain the depth dependence of stress, we have used larger scale syntheses of stress for onshore UK produced by the BGS (e.g., Kingdon et al, 2016;Fellgett et al, 2018). The stress-depth plot in Figure 15a has been constructed using the data shown in Fellgett et al (2018), and shows that, in general, a strike-slip fault regime with  =  Hmax is most likely. However, given the known uncertainties in the data, a normal fault regime (1 = V) cannot be ruled out, especially at depth.…”

Section: Coalfields In South Wales and Greater Manchester Ukmentioning

confidence: 99%

De-risking the energy transition by quantifying the uncertainties in fault stability

Healy¹,

Hicks²

2022

Preprint

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The operations needed to decarbonise our energy systems increasingly involve faulted rocks in the subsurface. To manage the technical challenges presented by these rocks and the justifiable public concern over induced seismicity, we need to assess the risks. Widely used measures for fault stability, including slip and dilation tendency and fracture susceptibility, can be combined with Response Surface Methodology from engineering and Monte Carlo simulations to produce statistically viable ensembles for the analysis of probability. In this paper, we describe the implementation of this approach using custom-built open source Python code (pfs – probability of fault slip). The technique is then illustrated using two synthetic datasets and two case studies drawn from active or potential sites for geothermal energy in the UK, and discussed in the light of induced seismicity focal mechanisms. The analysis of probability highlights key gaps in our knowledge of the stress field, fluid pressures and rock properties. Scope exists to develop, integrate and exploit citizen science projects to generate more and better data, and simultaneously include the public in the necessary discussions about hazard and risk.

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Stress magnitudes across UK regions: New analysis and legacy data across potentially prospective unconventional resource areas

Cited by 14 publications

References 27 publications

An open-access stress magnitude database for Germany and adjacent regions

An open-access stress magnitude database for Germany and adjacent regions

Lithological Constraints on Borehole Wall Failure; a Study on the Pennine Coal Measures of the United Kingdom

De-risking the energy transition by quantifying the uncertainties in fault stability

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