Abnormal reverse faulting above a depleting reservoir

Odonne, Francis; Ménard, Isabelle; Massonnat, Gérard; Rolando, Jean-Paul

doi:10.1130/0091-7613(1999)027<0111:arfaad>2.3.co;2

Cited by 37 publications

(32 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Microseismic activities in the overburden have also been observed during reservoir pressure depletion associated with hydrocarbon production at some fields (Segall 1989;Odonne et al 1999). Note, however that all the injection induced microseismc events recorded at In Salah, Otway, Weyburn and Aneth to date are so small that they are only detectable using geophones.…”

Section: Coupled Flow and Geomechanical Models For Gcsmentioning

confidence: 98%

The Geomechanics of CO2 Storage in Deep Sedimentary Formations

2012

View full text Add to dashboard Cite

This paper provides a review of the geomechanics and modeling of geomechanics associated with geologic carbon storage (GCS), focusing on storage in deep sedimentary formations, in particular saline aquifers. The paper first introduces the concept of storage in deep sedimentary formations, the geomechanical processes and issues related with such an operation, and the relevant geomechanical modeling tools. This is followed by a more detailed review of geomechanical aspects, including reservoir stressstrain and microseismicity, well integrity, caprock sealing performance, and the potential for fault reactivation and notable (felt) seismic events. Geomechanical observations at current GCS field deploy-

show abstract

Section: Coupled Flow and Geomechanical Models For Gcsmentioning

confidence: 98%

The Geomechanics of CO2 Storage in Deep Sedimentary Formations

2012

View full text Add to dashboard Cite

show abstract

“…Over time, the extensional zones migrate further outward and compressive zones further down. Consequently, reverse faulting is favored above and below the reservoir, while normal faulting is favored along the flanks of the reservoir [38][39][40][41] (Figure 8). The normal fault associated to the M w 6.5 Botswana earthquake is located more than 20 km below the CBM reservoir, where the potential anthropogenic stress changes are compressive and thrust faulting is privileged with respect to normal faulting.…”

Section: Discussionmentioning

confidence: 99%

Did Anthropogenic Activities Trigger the 3 April 2017 Mw 6.5 Botswana Earthquake?

et al. 2017

View full text Add to dashboard Cite

Abstract:On 3 April 2017, a M w 6.5 earthquake occurred in Botswana, representing the secondstrongest earthquake registered since 1949. Such an intraplate event occurred in a low seismic hazard area and was suspected to be an artificial earthquake induced by nearby anthropogenic activities (gas extraction). The possible relation between anthropogenic activities and the earthquake occurrence has been qualitatively investigated. We estimated the geometric and kinematic characteristics of the causative fault from the modeling of Sentinel-1 InSAR interferograms. Our best-fit solution for the main shock is represented by a normal fault located at a depth greater than 20 km, dipping 65 • northeast, with a right-lateral component, and a mean slip of 2.7 m. The retrieved fault geometry and mechanism are incompatible with the hypothetical stress perturbation caused by the anthropogenic activities performed in the area. Therefore, the 3 April 2017 Botswana earthquake can be classified as a natural intraplate earthquake.

show abstract

“…A similar, smaller-scale natural phenomenon is sinkhole formation induced by karst-rock dissolution (Gutierrez et al, 2008). Man-made phenomena include ground subsidence or collapse induced by sub-surface mining (Walters, 1978;Whittaker and Reddish, 1989), water extraction (Arkin and Gilat, 2000) or hydrocarbon recovery (Nagel, 2001;Odonne et al, 1999). In all cases, removal of material from the sub-surface body causes deformation and stress changes within the surrounding host-rock.…”

Section: Introductionmentioning

confidence: 98%

Stress evolution during caldera collapse

Holohan

Schöpfer

Walsh

2015

Earth and Planetary Science Letters

View full text Add to dashboard Cite

8The dynamics of caldera collapse are subject of long-running debate. Particular uncertainties 9 concern how stresses around a magma reservoir relate to fracturing as the reservoir roof collapses, 10 and how roof collapse in turn impacts upon the reservoir. We used two-dimensional Distinct 11Element Method models to characterise the evolution of stress around a depleting sub-surface 12 magma body during gravity-driven collapse of its roof. These models illustrate how principal stress 13 directions rotate during progressive deformation so that roof fracturing transitions from initial 14 reverse faulting to later normal faulting. They also reveal four end-member stress paths to fracture, 15 each corresponding to a particular location within the roof. Analysis of these paths indicates that 16 fractures associated with ultimate roof failure initiate in compression (i.e. as shear fractures). We 17 also report on how mechanical and geometric conditions in the roof affect pre-failure unloading and 18 post-failure reloading of the reservoir. In particular, the models show how residual friction within a 19 failed roof could, without friction reduction mechanisms or fluid-derived counter-effects, inhibit a 20 return to the initial pre-collapse pressure in the magma reservoir. Many of these findings should be 21 Holohan et al -Stress evolution during caldera subsidence -EPSL -Rev. FinalPage 1

show abstract

Abnormal reverse faulting above a depleting reservoir

Cited by 37 publications

References 0 publications

The Geomechanics of CO2 Storage in Deep Sedimentary Formations

The Geomechanics of CO2 Storage in Deep Sedimentary Formations

Did Anthropogenic Activities Trigger the 3 April 2017 Mw 6.5 Botswana Earthquake?

Stress evolution during caldera collapse

Contact Info

Product

Resources

About