Creep behavior of Bure clayey rock

Gasc‐Barbier, Muriel; Chanchole, S.; Bérest, Pierre

doi:10.1016/j.clay.2003.12.030

Cited by 137 publications

(58 citation statements)

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“…Few data exist on creep behavior of Opalinus clay (Naumann et al, 2007), Boom clay (Yu et al, 2015) and Callovia-Oxfordian Bure Clay (Gasc-Barbier et al, 2004) and other argillaceous rocks (Fabre and Pellet, 2006;Zhang and Rothfuchs, 2004). These studies show that even under low differential stress (< 16 MPa) the apparent steady creep rate increases with stress nonlinearly.…”

Section: Effect Of Stress Pressure and Temperature On Secondary Creepmentioning

confidence: 99%

“…Few data exist dealing with the creep behavior of Opalinus clay (Naumann et al, 2007), Boom clay (Yu et al, 2015), Callovia-Oxfordian Bure Clay (Gasc-Barbier et al, 2004), and other argillaceous rocks (Zhang and Rothfuchs, 2004;Fabre and Pellet, 2006). Creep experiments on shales focus on compaction and consolidation (Cogan, 1976;de Waal and Smits, 1988;Dudley et al, 1998), the effect of adsorption and swelling on creep (Heller and Zoback, 2011;Hol and Zoback, 2013) and on viscoelastic or viscoplastic creep of shales in response to nanoindentation (Mighani et al, 2015) and applied differential stresses at elevated confining pressures (Almasoodi et al, 2014;Zoback, 2009, 2010;Chong et al, p [5] creep is enhanced at high differential stress, high clay content, in the presence of water and if loaded normal to bedding orientation.…”

Section: Introductionmentioning

confidence: 99%

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Creep of Posidonia Shale at Elevated Pressure and Temperature

et al. 2017

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The economic production of gas and oil from shales requires repeated hydraulic fracturing operations to stimulate these tight reservoir rocks. Besides simple depletion, the often observed decay of production rate with time may arise from creep-induced fracture closure.We examined experimentally the creep behavior of an immature carbonate-rich Posidonia shale, subjected to constant stress conditions at temperatures between 50° and 200°C and confining pressures of 50 to 200 MPa, simulating elevated in-situ depth conditions. Samples showed transient creep in the semibrittle regime with high deformation rates at high differential stress, high temperature, and low confinement. Strain was mainly accommodated by deformation of the weak organic matter and phyllosilicates and by pore space reduction.The primary decelerating creep phase observed at relatively low stress can be described by an empirical power law relation between strain and time, where the fitted parameters vary with temperature, pressure and stress. Our results suggest that healing of hydraulic fractures at low stresses by creep-induced proppant embedment is unlikely within a creep period of several years. At higher differential stress, as may be expected in situ at contact areas due to stress concentrations, the shale showed secondary creep, followed by tertiary creep until failure. In this regime, microcrack propagation and coalescence may be assisted by stress corrosion.Secondary creep rates were also described by a power law, predicting faster fracture closure rates than for primary creep, likely contributing to production rate decline. Comparison of our data with published primary creep data on other shales suggest that the long-term creepbehavior of shales can be correlated to their brittleness estimated from composition. Low creep strain is supported by a high fraction of strong minerals that can build up a load-bearing framework.

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Section: Effect Of Stress Pressure and Temperature On Secondary Creepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Creep of Posidonia Shale at Elevated Pressure and Temperature

et al. 2017

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“…According to other studies (Zhang and Rothfuchs, 2007), some clayey rocks exhibited a significant creep capacity even at low stresses of 0.7 to 1 MPa and the steady state creep rates observed varied in a range of 10 −11 /s to 10 −10 /s. At the same time, temperature and saturation effects on clayey rocks were examined by a series of creep tests when samples were submitted to multistep deviatoric stresses of 2, 5, 10, 15 or 20 MPa (Gasc-Barbier et al, 2004). Their results showed that the argillite creep response was sensitive to the loading history, saturation degree as well as the temperature, but no clear conclusions were identified due to the variability of tested samples used in their tests.…”

Section: Introductionmentioning

confidence: 97%

Effects of deviatoric stress and structural anisotropy on compressive creep behavior of a clayey rock

Liu

Xie

Shao

et al. 2015

Applied Clay Science

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“…The COX formation is characterized by a low hydraulic conductivity of the order of 10 212 m s 21 consistently over the region investigated (Distinguin & Lavanchy 2007), a good homogeneity with virtually no tectonic-induced features such as fractures or joints, and a mineralogical composition that ensures high retention capacity and chemical stability (Gaucher et al 2004). From the mechanical viewpoint, the presence of quartz and carbonates in the rock composition gives the rock a reasonably high mechanical strength (Naumann et al 2007), whereas the clays and especially the swelling properties of smectite make the COX argillite easily deformable with a high potential to creep (Gasc-Barbier et al 2004;Zhang & Rothfuchs 2004;Fabre & Pellet 2006).…”

Section: Repositories In Soft Rock Formationsmentioning

confidence: 99%

Rock physics and geomechanics in the study of reservoirs and repositories

David

Ravalec-Dupin

2007

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Reservoir management for hydrocarbon extraction and repositories design for radioactive waste storage are two different areas in which rock physics and geomechanics provide valuable information. Although the targets and objectives are different, similar approaches and common attributes exist in both fields: safety assessment, short-to long-term prediction, integration of various scales of investigation, and remote monitoring, among others. Nevertheless, there are also important differences: reservoirs at depth are investigated through remote geophysical studies, well-logging and/or core samples retrieval, whereas direct access to repositories is possible through excavation in the host formation in which underground research laboratories can be constructed. We review a number of studies focusing on geomechanics and rock physics applied to the characterization of reservoirs and repositories, including laboratory experiments and predictive models, at different scales.Reservoir management and assessment of repository performance require the integration of different fields in Earth sciences, including geochemistry, geophysics, structural geology, and, in the case of interest here, rock physics and geomechanics. We present recent advances in the studies of reservoirs and repositories with the aim of emphasizing how rock physics and geomechanics help to obtain a better insight into important issues linked to reservoir management for exploitation of natural resources, and to repository safety assessment for hazardous waste storage in the geological environment.In the area of reservoir management, the importance of geomechanics in problems such as wellbore stability, hydraulic fracturing and subsidence is well known. Recently, there has been a growing interest in the development of a link between fluid flow simulators and geomechanical models. Several approaches have been proposed to incorporate the correct physics and to account for physical phenomena usually neglected in reservoir simulation. New techniques developed in laboratory studies provide relevant data for this integration. The approaches differ in the degree of coupling. The stronger the coupling, the more computationally demanding the simulation. Numerical experiments showed that coupling is of interest for poorly consolidated reservoirs such as chalk reservoirs. In other cases, one may wonder whether a more accurate modelling of production processes justifies the required computation cost. Complementary sensitivity studies have to be performed to better estimate the conditions in which the coupling is worthwhile.In the area of underground waste storage, the key issue is to design a repository as safe as possible for human activity and for the environment at the near surface, on time scales of the order of hundreds of years. This challenging task requires us to identify favourable geological targets for the storage, and to develop extensive scientific research in different fields, so as to obtain eventually a predictive model of the repository evolu...

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Creep behavior of Bure clayey rock

Cited by 137 publications

References 1 publication

Creep of Posidonia Shale at Elevated Pressure and Temperature

Creep of Posidonia Shale at Elevated Pressure and Temperature

Effects of deviatoric stress and structural anisotropy on compressive creep behavior of a clayey rock

Rock physics and geomechanics in the study of reservoirs and repositories

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