Jun 28, 2021· Fortin, J, Guéguen, Y, Schubnel, A. Effect of pore collapse and grain crushing on ultrasonic velocities and Vp/Vs. J Geophys Res 2007 ; 112: B08207 . Google Scholar | Crossref
May 14, 2013· Fortin, J., Y. Guéguen, and A. Schubnel (2007), Effects of pore collapse and grain crushing on ultrasonic velocities and vp/vs, Journal of geophysical research, 112, doi:10.129/2005JB004,005. Fortin J., Stanchits S., Vinciguerra S., Guéguen Y. (2011) Influence of thermal and mechanical cracks on permeability and elastic wave velocities in a ...
The wet samples were deformed in drained conditions with 10 MPa pore pressure at room temperature. Under hydrostatic condition, the onset of grain crushing and pore collapse P* occurred in the less porous material at an effective pressure of 41 MPa. Intense microcracking was observed in the deformed sample which failed by cataclastic flow.
Oct 18, 2013· Effect of pore collapse and grain crushing on ultrasonic velocities and Vp/Vs, 2007,. Journal of ... Frequency and pore fl uid e ffects on elastic properties : New laboratory measurements on Icelandic basalt and Fontainebleau sandstone. Proceedings of the 1st International Workshop on Rock Physics, 2011, Colorado School of Mines ...
Sep 10, 2014· Fortin J, Guéguen Y, Schubnel A (2007) Effects of pore collapse and grain crushing on ultrasonic velocities. J Geophys Res Solid Earth 112(B8):34–42. Article Google Scholar Gabet E, Mudd S (2006) The mobilization of debris flows from shallow landslides. Geomorphology 74(1–4):207–218
Abstract The variations of the static and dynamic moduli of porous rocks as a function of differential pressure have been described in terms of pore microstructure, i.e., the effects of cracks (soft pores) and intergranular (stiff) pores. Specifically, the first play a major role on the elastic properties of rocks. By using the Mori-Tanaka theory, this work relates rock elastic properties to ...
Pore collapse and grain crushing prevail in the process zone of sandstone and the amount of tensile cracks is much smaller than in granite. References. Glaser, S.D. & Nelson, P.P. 1992. Acoustic emissions produced by discrete fracture in rock. Part 2.
Such high levels of depletion can result in severe reservoir compaction and pore collapse, leading to a rapid loss in permeability, generation of fines as the byproducts of pore collapse and grain crushing, subsidence, wellbore instability, damage to well completion integrity, and loss of caprock containment.
At first, increase in hydrostatic pressure was 9 accompanied by a simultaneous increase of both Vp and Vs as expected. At a critical 10 effective confining pressure P*, a large mechanical decrease of porosity was observed that 11 was due to pore collapse and grain crushing.
Aug 20, 2007· 50 pore collapse and grain crushing (nonlocalized cataclastic 51 flow) [ Zhang et al., 1990; W ong et al., 1997]. 52 [ 3 ] Recent field [ Mollema and Anto nellini, 1996], and
An Integrated Mechanical, Ultrasonic and Microstructural Study Claudio Delle Piane1, Michael B. Clennell1, Jeremie Dautriat1, ... grain crushing and pore collapse . Weakening Water concentration Surface energy. Experimental values . Atomistic simulations . Røyne et al. (2011) Weakening
Jun 01, 2012· A hydrostatic compression test on Berea sandstone has shown that grain crushing and pore collapse occur at a critical pressure of P* around 390 MPa (Wong & Baud 1999). Figure 3 Open in new tab Download slide
Aug 21, 2007· [32] When pore collapse and grain crushing take place (at P = P*), the crack density ρ raises from 0 to a mean value of 0.1 (curve 3). An anomalous feature just beyond P * is that crack densities inferred from equations (8) and (9) become different: Inversion of G moduli gives a ρ value close to 0.2, whereas inversion of K moduli data gives a ...
Jan 09, 2020· Based on our long-term studies of ultrasonic grain refinement of light alloys 37,39,40,41,42, we employ high-intensity ultrasound to control the solidification and grain …
The pore distribution is bimodal: crack porosity is 1%, and equant pores porosity is 7%, ... Y. Gueguen, and A. Schubnel, Effect of pore collapse and grain crushing on ultrasonic velocities and VP/VS: Journal of Geophysical Research, 112, B08207, doi :10.1029/2005JB004005,2007.
2 Effects of pore collapse and grain crushing on 3 ultrasonic velocities and Vp/Vs . By Re Schubnel. Abstract. ... a large mechanical decrease of porosity was observed that 11 was due to pore collapse and grain crushing. Theoretically, two different processes are 12 affecting the elastic wave velocities in counteracting ways during cataclastic ...
byproducts of pore collapse and grain crushing, subsidence, wellbore instability, damage to well completion integrity, and loss of caprock containment. Rock mechanics data was needed to assess the possibility of pore collapse and to prevent and mitigate risks from adverse reservoir compaction. What Schlumberger recommended
Aug 01, 2007· At a critical effective confining pressure P*, a large mechanical decrease of porosity was observed that was due to pore collapse and grain crushing. Theoretically, two different processes are affecting the elastic wave velocities in counteracting ways during cataclastic compaction: cracking and porosity decrease.
Effects of pore collapse and grain crushing on ultrasonic velocities and V p/V s Je´roˆme Fortin,1 Yves Gue´guen,1 and Alexandre Schubnel2 Received 20 August 2005; revised 13 February 2007; accepted 6 June 2007; published 21 August 2007.
Fortin, J., Guéguen, Y. and Schubnel, A. [2007] Effects of pore collapse and grain crushing on ultrasonic velocities and Vp/Vs. Journal of Geophysical Research, 112 .
Mar 13, 2021· ultrasonic velocities and permeability of sandstone samples. (a) San-Andres 1 sample, pre-experimental. image. (b) San-Andres 1 sample, post- ... significant pore collapse and grain crushing.
Jun 25, 2015· Rock failure definition. Stress strain relationships in rocks examined the elastic behavior of rocks, which was largely reversible. Here we deal with permanent deformation. By rock failure, we mean the formation of faults and fracture planes, crushing, and relative motion of …
Evolution of stress-strain data, acoustic emission (AE) and ultrasonic characteristics were synchronously tested of granite under uniaxial compression by ultrasonic wave and AE sy
Grain crushing and pore collapse are the principal micromechanisms controlling the physics of compaction bands in porous rocks. Several constitutive models have been previously used to predict the formation and propagation of these bands. However, they do not account directly for the physical processes of grain crushing and pore collapse. The parameters of these previous models were …
In many reservoir engineering and tectonic problems, the ability to predict the occurrence and extent of inelastic deformation and strain localization hinges upon a fundamental understanding of the phenomenology and micromechanics of compaction in reservoir rock. This paper reviews recent research advances on inelastic compaction and strain localization in porous sandstone, with focus on the ...
Jun 25, 2015· Note that these relationships apply primarily to the brittle failure regime and cannot be used for grain crushing or pore collapse (as discussed in Compressive strength of rocks) or when substantial ductile or plastic deformation is involved. We will examine these proposed forms to interrelate terms and reduce unknowns to variables that can be ...
Effects of pore collapse and grain crushing on ultrasonic velocities and V p /V s J Fortin, Y Guéguen, A Schubnel Journal of Geophysical Research: Solid Earth 112 (B8), 2007
mechanics of compaction, such as bond/grain breakage and pore collapse. A notable exception is the work by Das et al. [16,21],inwhich the explicit incorporation of grain crushing allowed the authors to point out the importance of the rheological response on the simula-tion of both onset and propagation of compaction bands.