Evolution of the elastic moduli of seismogenic Triassic Evaporites subjected to cyclic stressing

Trippetta, Fabio; Collettini, Cristiano; Meredith, P. G.; Vinciguerra, Sergio

doi:10.1016/j.tecto.2013.02.011

Cited by 71 publications

(33 citation statements)

References 53 publications

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“…The evolutions of the Young modulus and the Poisson's ratio are particularly investigated during damage-controlled tests. Contrary to constant amplitude tests, most of the tests describe a trend of decreasing Young modulus (up to one third of decrease) (Eberhardt et al 1999;Heap et al 2009Heap et al , 2010Kendrick et al 2013), while some others report increasing Young modulus (Trippetta et al 2013). The Young modulus is also reported as increasing for the first few cycles and decreasing afterwards (Yang et al 2015).…”

Section: Ae Energymentioning

confidence: 81%

“…In these studies, such kind of low-cycle test is used to correlate damage with variations in cohesion and mobilised friction. Some other authors investigate the evolution of the Young modulus and Poisson's ratio as representative of damage (Heap et al 2010;Trippetta et al 2013;Schaefer et al 2015;Yang et al 2015) or assess the stress history or a rock sample (Lavrov 2001). Finally, ramp signals are defined by a constant amplitude but an increasing mean stress, as represented in Fig.…”

Section: Loadingmentioning

confidence: 99%

“…The number of cycles applied is mostly low and varies between 5 and 50 (Eberhardt et al 1999;Heap et al 2010;Trippetta et al 2013;Schaefer et al 2015;Yang et al 2015). The increasing stress from one cycle to the other approaches a monotonic loading, although some differences are noted, especially a slight decrease in strength (Yang et al 2015).…”

Section: Stress-strain Curvesmentioning

confidence: 99%

“…The number of cycles of this phase obviously depends on the stress amplitude increments. Stage II corresponds to material degradation where the Young modulus decreases and Poisson's ratio increases slightly (Yang et al 2015), or are almost constant (Trippetta et al 2013). Finally, at failure (Stage III) Poisson's ratio increases sharply and Young modulus decreases.…”

Section: Deformation Evolutionmentioning

confidence: 99%

“…Microscale fractures emit a large number of acoustic signal with a low amplitude, while macrocracks are characterised by few events of large amplitude. On the contrary, pore compaction is not expected to generate AE and friction between rough contact only induces lowamplitude AE (Trippetta et al 2013). Prikryl et al (2003) study the relations between acoustic emissions and the rock fabric.…”

Section: Crack Development and Measurementmentioning

confidence: 99%

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Section: Ae Energymentioning

confidence: 81%

Section: Loadingmentioning

confidence: 99%

Section: Stress-strain Curvesmentioning

confidence: 99%

Section: Deformation Evolutionmentioning

confidence: 99%

Section: Crack Development and Measurementmentioning

confidence: 99%

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Diagenetic compaction experiments on simulated anhydrite fault gouge under static conditions

2014

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Faults that crosscut subsurface CO 2 storage systems offer potential leakage pathways, especially if fault reactivation and dilation occur. After reactivation, however, newly formed fault gouge is expected to gradually compact and seal as a function of time. To estimate the time scale on which this occurs, the processes that control compaction must be understood. We performed uniaxial compaction experiments on simulated anhydrite fault gouge to investigate the deformation mechanisms that operate under postslip conditions in faulted anhydrite caprocks. This involved constant stress (5-12 MPa) and stress stepping experiments (5/7.5/10 MPa) performed at 80°C, under dry and wet conditions, on fault gouge samples prepared from crushed natural anhydrite sieved into different grain size fractions in the range 20-500 μm. Dry samples showed little to no compaction creep, whereas wet samples (i.e., flooded with presaturated CaSO 4 solution) showed rapid compaction. Our mechanical data and microstructural observations on wet samples suggest that for fine grain sizes (<50 μm) and low stresses, gouge compaction is controlled by diffusion-controlled pressure solution. With increasing grain size and stress, fluid-assisted subcritical microcracking becomes dominant. Pressurizing solution-flooded samples with CO 2 (15 MPa) led to no significant effect on compaction rates in fine-grained material, but it decreased compaction rates in coarse samples. Since fine grain sizes are expected in reactivated faults, we infer that pressure solution will dominate in anhydrite (cap)rocks, with extrapolation of our lab data to reservoir conditions suggesting sealing time scales of a few decades.

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Tectonic control on the petrophysical properties of foredeep sandstone in the Central Apennines, Italy

et al. 2014

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Petrophysical properties of rocks and their applicability at larger scale are a challenging topic in Earth sciences. Petrophysical properties of rocks are severely affected by boundary conditions, rock fabric/microstructure, and tectonics that require a multiscale approach to be properly defined. Here we (1) report laboratory measurements of density, porosity, permeability, and P wave velocities at increasing confining pressure conducted on Miocene foredeep sandstones (Frosinone Formation); (2) compare the laboratory results with larger-scale geophysical investigations; and (3) discuss the effect of thrusting on the properties of sandstones. At ambient pressure, laboratory porosity varied from 2.2% to 13.8% and P wave velocities (V p ) from 1.5 km/s to 2.7 km/s. The P wave velocity increased with confining pressure, reaching between 3.3 km/s and 4.7 km/s at 100 MPa. In situ V p profiles, measured using sonic logs, matched the ultrasonic laboratory measurement well. The permeability varied between 1.4 × 10 À15 m 2 and 3.9 × 10 À15 m 2 and was positively correlated with porosity. The porosity and permeability of samples taken at various distances to the Olevano-Antrodoco fault plane progressively decreased with distance while P wave velocity increased. At about 1 km from the fault plane, the relative variations reached 43%, 65%, and 20% for porosity, permeability, and P wave velocity, respectively. This suggests that tectonic loading changed the petrophysical properties inherited from sedimentation and diagenesis. Using field constraints and assuming overburden-related inelastic compaction in the proximity of the fault plane, we conclude that the fault reached the mechanical condition for rupture in compression at differential stress of 64.8 MPa at a depth of 1500 m.

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Evolution of the elastic moduli of seismogenic Triassic Evaporites subjected to cyclic stressing

Cited by 71 publications

References 53 publications

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

Diagenetic compaction experiments on simulated anhydrite fault gouge under static conditions

Tectonic control on the petrophysical properties of foredeep sandstone in the Central Apennines, Italy

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