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2 Effects Of Pore Collapse And Grain Crushing On 3

2 effects of pore collapse and grain crushing on 3 ultrasonic velocities and vpvs 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

Pdf Experimental Results On The Combined Effects Of

Effects of pore collapse and grain crushing on ultrasonic velocities and vp vs article fulltext available a large mechanical decrease of porosity was observed that was due to pore collapse

Effects Of Pressure On Pore Characteristics And

The effective pressures in our experiments were too small to change the shapes of most grains and pores as grain crushing occurs only at pressures above effects of pore collapse and grain crushing on ultrasonic velocities and vpvs j geophys mechanisms affecting ultrasonic wave propagation in fluidcontaining sandstone under high

Elastic Wave Velocities And Permeability Evolution During

Oct 01 2005 on the one hand pore collapse and porosity reduction tend to increase the elastic wave velocities on the other hand elastic wave velocities were decreasing because of grain crushing which was observed to be the dominant factor for inelastic compactive strains smaller than 6

Shearbanding In Drained And Undrained Triaxial Tests On

Clues to understand the behaviour of rocks at large stress when pore collapse and grain crushing are important a challenging issue is the modelling of grain crushing phenomenon and its influence on the hydromechanical properties grain crushability can be included in the modelling procedure using discrete element analysis 18 19

Evolution Of Hydraulic And Elastic Properties Of Reservoir

May 01 2019 the ct values of individual pores indicate that the grayscale value changes gradually from the grain boundary to the pore center jiang and tsuji 2014 effects of pore collapse and grain crushing on ultrasonic velocities and vpvs j geophys res 112 2007 p b08207 1010292005jb004005

Pdf Experimental Investigation Of Elastic Weakening

Fortin j gu guen y and schubnel a 2007 effects of pore collapse and grain crushing on ultrasonic velocities and vpvs journal of geophysical research 112

A Simple Way To Model The Pressure Dependency Of Rock

Apr 22 2016 fig 2 gives an example showing the relationship between the calculated pwave velocity and the iteration number n for a hypothetical sandstone sample consisting of 2 pores ie pore 1 and pore 2 respectively with volume fractions of 01 and 002 and aspect ratios of 01 and 001 respectively the calculations at each iteration number are made using different mixing orders ie pore 1

Study Of Effects Of Weathering Factors On Internal

The paper addresses the use of laser ultrasonic structuroscopy to study how weathering affects the internal structure of rocks used for facing buildings for 1250 hours rock samples were subjected to 150 cycles of freezing at20 c and thawing in water at 20 c to determine their frost resistance also moistened every 30 minutes rock samples were exposed to thermal and ultraviolet

Characterizing The Nonlinear Interaction Of S And Pwaves

Jan 16 2015 the nonlinear elastic response of rocks is known to be caused by the rocks microstructure particularly cracks and fluids this paper presents a method for characterizing the nonlinearity of rocks in a laboratory scale experiment with a unique configuration this configuration has been designed to open up the possibility of using the nonlinear characterization of rocks as an

Damage And Changes In Mechanical Properties Of A Gabbro

Thermal loading of rocks at high temperatures induces changes in their mechanical properties in this study a hard gabbro was tested in the laboratory specimens were slowly heated to a maximum temperature of 1000 c subsequent to the thermal loading specimens were subjected to uniaxial compression a drastic decrease of both unconfined compressive strength and elastic moduli was

Fluidrock Interactions In Porous Carbonate Rocks An

Dec 28 2015 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

Digital Rock Physics For Fast And Accurate Special Core

May 06 2012 note that this assumes that the pore space and rock framework deforms without large microstructural changes such as pore collapse grain rotation and grain crushing figure 11 pwave velocity and stress for carbonate samples

Solidfluid Substitution Scheme Constrained By Porescale

To ensure gassmann consistency glubokovskikh et al modelled the compliant pores as graintograin contacts open into stiff pores compliant pores are modelled as thin circular disks with tractionfree edges the effects of pore collapse and grain crushing on ultrasonic velocities and vpvs j

Solidfluid Substitution Scheme Constrained By Porescale

To ensure gassmann consistency glubokovskikh et al modelled the compliant pores as graintograin contacts open into stiff pores compliant pores are modelled as thin circular disks with tractionfree edges the effects of pore collapse and grain crushing on ultrasonic velocities and vpvs j

Digital Rock Physics Numerical Prediction Of Pressure

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

Umd

Grain crushing and pore collapse as illustrated by the micrograph shown in fig 8 the pore collapse re sults in an overall reduction of permeability for flows in all directions however significant anisotro py in microcracking was evident in the deformed samples the density of microcracks aligned parallel

Shear Enhanced Compaction Band Identification At The

Laboratory scale pore collapse grain crushing 9th euroconference on rock physics and geomechanics trondheim norway 1721 october 2011 introduction material methods results conclusions heterogeneity of the rock rearrangement of grains grain breakage narrow roughly planar zones of localised porosity loss reduced permeability

On The Porescale Mechanisms Leading To Brittle And

Various different ways to model pore collapse also have been proposed and among them wang et al 29 used grain shrinkage to simulate intragranular cracking and grain crushing processes in these models porosity is derived based on the spaces generated from the random assembly of the circular disks or spherical particles

Laboratory Measurements Of Low And Highfrequency

Ranges in which rocks are far from conditions of grain crushing and pore collapse currently their equipment is being modified to allow for torsional and flexural oscillation measurements jackson et al 2011 a complete set of elastic moduli youngs modulus and poissons ratio is measured on a dry and glycerinsaturated

Effect Of Loading Path And Porosity On The Failure Mode

The onset of grain crushing and pore collapse was marked by a surge in acoustic emission activity a hertzian fracture mechanics model was formulated to analyze the roles of porosity grain size and fracture toughness in controlling the onset of hydrostatic and shearenhanced compaction stereological measurements of the microcrack density show

Experimental Investigation On Static And Dynamic Bulk

Sep 29 2020 the induced grain cracking for bentheim sandstone under hydrostatic loading is not expected to occur because the corresponding critical pressure denoting the onset of grain crushing and pore collapse was experimentally found to be 440 mpa tembe et al 2008 far more than our applied maximum pressure hence the whole void space of bentheim

Influence Of Ultrasonic Melt Treatment On Microstructure

1 influence of ultrasonic melt treatment on microstructure and mechanical properties of alsi9cu3 alloy h puga a s costa a j barbosa a s ribeiro b m prokic c act2m centre for mechanical and materials technologies universidade do minho azur m 4800058 guimar es portugal bfeup departamento de eng metal rgica e de materiais 4200465 porto portugal

The Compressibility And Shear Characteristics Of Soils

Sep 10 2014 field and shuttle radar topographic mission data were used to create digital elevation model and geologic maps to study the roles of geology discontinuities elevation steep slopes deep valleys and drainage patterns on the frequent occurrence of longtravel landslides along the nigeriacameroon border the undrained shear behaviors of sandy specimens from two localities

Reservoir Quality Aapg Wiki

Jan 23 2019 compaction reduces the porosity and permeability of a rock by causing the following 1 grain rotation and rearrangement into a tighter packing configuration 2 plastic deformation of ductile grains that flow into adjacent pores and pore throats 3 fracturing and crushing of brittle grains and 4 pressure solution in the form of grain

Evolution Of Ultrasonic Velocity And Dynamic Elastic

May 10 2013 ultrasonic wave transmission has been used to investigate processes that influence frictional strength strain localization fabric development porosity evolution and friction constitutive properties in granular materials under a wide range of conditions we present results from a novel technique using ultrasonic wave propagation to observe the evolution of elastic properties during

Deformation Bands In Porous Carbonate Grainstones Field

Recent fieldbased studies documented deformation bands in porous carbonates these structures accommodate volumetric andor shear strain by means of pore collapse grain rotation andor sliding

Mechanical Compaction Of Porous Sandstone An

Mpa this critical stress state is associated with the onset of grain crushing zhang et al 1990 the grains are crushed and the pores collapse resulting in an overall decrease in porosity the sample deformed at an effective confining pressure of 10 mpa is representative of the brittle faulting regime figure 3b and 4b the differential

Effects Of Pressure On Pore Characteristics And

The effective pressures in our experiments were too small to change the shapes of most grains and pores as grain crushing occurs only at pressures above effects of pore collapse and grain crushing on ultrasonic velocities and vpvs j geophys mechanisms affecting ultrasonic wave propagation in fluidcontaining sandstone under high

Ultrasonic Investigation Of Granular Materials Subjected

Jul 01 2018 in other attempts variations in ultrasonic wave velocity were related to pore collapse and grain crushing in sand and sandstone materials these experimental works related the observed rate of variations in shear and compressional wave velocities during compression to a particle crushing and b porosity reduction 48

Grain Crushing Pore Collapse And Strain Localization In

Cite this chapter as wong t baud p 2009 grain crushing pore collapse and strain localization in porous sandstone in kolymbas d viggiani g eds mechanics of natural solids

Ultrasonic Sand Crushing Principle Mine Equipments

Effects of pore collapse and grain crushing on ultrasonic velocities principle of symmetry 67 microstructural observations that grain crushing in sand 84 stone is 200 of ultrasonic p and s velocities as well as local strains

Pdf Co 2 Brine Substitution Effects On Ultrasonic Wave

Two modeling scenarios for pore fluid distribution uniformly u with patch parameter q 1 and patchy p with q 02 at frequencies 1 0027 2 017 and 3 10725

Simulation Of Localized Compaction In Highporosity

Mechanics of compaction such as bondgrain breakage and pore collapse a notable exception is the work by das et al 1621inwhich the explicit incorporation of grain crushing allowed the authors to point out the importance of the rheological response on the simulation of both onset and propagation of compaction bands

Us4439497a Ultrasonic Sound Absorber Google Patents

Us4439497a us06382535 us38253582a us4439497a us 4439497 a us4439497 a us 4439497a us 38253582 a us38253582 a us 38253582a us 4439497 a us4439497 a us 4439497a authority us united states prior art keywords sound sound absorbing fluid adsorber waves prior art date 19820527 legal status the legal status is an assumption and is not a legal conclusion

Frequency And Fluid Effects On Elastic Properties Of

Jan 27 2010 the entrance pore radius is directly derived from the intrusion mercury pressure by the washburn law the open porosity is 793 the bulk density is 277 300 for skeletal density and the average pore diameter is 019 m the pore distribution is clearly bimodal one peak is around 01 m and an other one around 100 m they can be

Estimation Of Pore Microstructure By Using The Static And

Jan 01 2019 experimental measurements of the static and dynamic bulk compressibilities of the two sandstones are shown in fig 4as discussed in section 22 if the relation between stress and strain or wave velocities is known the expressions of the static dynamic bulk compressibility can be derivedthe fit is shown in table 1for navajo sandstone the estimated crack porosity is 0079 by using the

Sun Chao Phd Student Geologie Researchgate

A saturated bleurswiller sandstone of 25 porosity was compacted by increasing the confining pressure over the critical pressure p which characterizes the onset of pore collapse and grain crushing

Adnoc Offshore Conducts Rock Mechanics Tests To Predict

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

2 Effects Of Pore Collapse And Grain Crushing On 3

2 effects of pore collapse and grain crushing on 3 ultrasonic velocities and vpvs 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

44 Compression Failure Pore Collapse Github Pages

4 4 compression failure pore collapse if compression stresses are high enough grains can crush filling the pore space pore collapse may happen in nature due to rock burial and also in petroleum engineering during reservoir depletion in both cases effective stresses increase in all directions

Rock Failure Relationships Petrowiki

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

Aug 21 2007 32 when pore collapse and grain crushing take place at p p the crack density raises from 0 to a mean value of 01 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 value close to 02 whereas inversion of k moduli data gives a value closer to 005

Effects Of Pore Collapse And Grain Crushing On Ultrasonic

S during pore collapse and grain crushing is not straightforward indeed elastic wave velocities can be affected by two distinct and competitive mechanisms 1 cracking and 2 porosity reduction in the first case it is well known that elastic wave velocities may be reduced substantially during triaxial compression experiments in the

Effects Of Pore Collapse And Grain Crushing On Ultrasonic

Aug 21 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

Pdf Effects Of Pore Collapse And Grain Crushing On

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

Effects Of Pore Collapse And Grain Crushing On Ultrasonic

2 effects of pore collapse and grain crushing on 3 ultrasonic velocities and v pv s 4 je rome fortin1 yves gue guen1 and alexandre schubnel2 5 received 20 august 2005 revised 13 february

Effects Of Pore Collapse And Grain Crushing On Ultrasonic

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

Effect Of Pore Collapse And Grain Crushing On The

Jul 29 2020 abstract a saturated bleurswiller sandstone of 25 porosity was compacted by increasing the confining pressure over the critical pressure p which characterizes the onset of pore collapse and grain crushing the frequencydependence of youngs moduli were measured before and after the compaction using forcedoscillation method in a triaxial cell

Ultrasonic Investigation Of Granular Materials Subjected

Jul 01 2018 in other attempts variations in ultrasonic wave velocity were related to pore collapse and grain crushing in sand and sandstone materials these experimental works related the observed rate of variations in shear and compressional wave velocities during compression to a particle crushing and b porosity reduction

Pdf Comparative Study On Damage Characterization And

Effects of pore collapse and grain crushing on ultrasonic velocities and vp vs article fulltext available a large mechanical decrease of porosity was observed that was due to pore collapse

Seismic Velocities Poissons Ratios And Potential Auxetic

Sep 05 2019 the critical pressure p indicates the transition from elastic compaction to cataclastic compaction ie pore collapse and grain crushing note that p depends on the porosity pore size grain size graincorner cracks and modal composition of the rock ultrasonic velocity measurements in volcanic rocks correlation with microstructure

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