Saturation of porous rock and measurement of the B coefficient

Published on Dec 1, 2013
Roman Y. Makhnenko12
Estimated H-index: 12
(UMN: University of Minnesota),
Joseph F. Labuz32
Estimated H-index: 32
(UMN: University of Minnesota)
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Abstract
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#1R. M. Makhnenko (UMN: University of Minnesota)H-Index: 1
#2Joseph F. LabuzH-Index: 32
The unjacketed bulk modulus of sandstone, Ks′, is often considered to be equal to the bulk modulus of quartz, the main mineral which forms it. However, preliminary tests and some other works show that for Berea sandstone this assumption might be violated. Three different types of laboratory experiments were
10 CitationsSource
#1David J. HartH-Index: 11
#2Herbert F. Wang (UW: University of Wisconsin-Madison)H-Index: 33
Gassmann’s original equation provides a means to relate bulk elastic parameters of a porous material with the compressibility of the pore fluid. The original analysis assumed microhomogeneity and isotropy, which assumed that pore compressibility was equal to grain compressibility. Although subsequent theoretical arguments have shown that Gassmann’s original assumption is violated for most rocks and that pore compressibility need not equal grain compressibility, few experimental studies have comp...
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#1Siavash Ghabezloo (ENPC: École des ponts ParisTech)H-Index: 20
#2Jean Sulem (ENPC: École des ponts ParisTech)H-Index: 34
Abstract For evaluation of the undrained thermo-poro-elastic properties of saturated porous materials in conventional triaxial cells, it is important to take into account the effect of the dead volume of the drainage system. The compressibility and the thermal expansion of the drainage system, along with the dead volume of the fluid filling this system, influence the measured pore pressure and volumetric strain during an undrained thermal or mechanical loading in a triaxial cell. The correction ...
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11 CitationsSource
#1Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
#2Shongtao Dai (UMN: University of Minnesota)H-Index: 10
Last. Euripides PapamichosH-Index: 22
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A new apparatus for determining the constitutive response of rock and concrete, named the University of Minnesota Plane-Strain Apparatus, was designed and built on a passive stiff-frame concept. The biaxial device, with U.S. Patent number 5,063,785, is unique, because it allows the failure plane to develop and propagate in an unrestricted manner, as opposed to conventional systems where the material is constrained by the testing apparatus. By placing the upper platen on a low friction linear bea...
77 CitationsSource
#1P.A. Berge (LLNL: Lawrence Livermore National Laboratory)H-Index: 1
#2Herbert F. Wang (UW: University of Wisconsin-Madison)H-Index: 33
Last. B.P. Bonner (LLNL: Lawrence Livermore National Laboratory)H-Index: 3
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Abstract We present laboratory measurements of Skempton's pore pressure buildup coefficient B for synthetic and natural sandstones, and use our results to estimate the unjacketed pore compressibility 1/Ko. Measured values of B are always near unity for differential pressures below ∼2 MPa, regardless of porosity, grain composition, or the presence of small amounts of clay in the samples. We observed B near 0.7–0.8 for differential pressures of about 8–21 MPa in a clay-free synthetic sandstone. Si...
35 CitationsSource
#1Emmanuel M Detournay (UMN: University of Minnesota)H-Index: 60
#2Alexander H.-D. Cheng (UD: University of Delaware)H-Index: 62
Publisher Summary This chapter focuses on fundamentals of poroelasticity. The presence of a freely moving fluid in a porous rock modifies its mechanical response. Two mechanisms play a key role in the interaction between the interstitial fluid and the porous rock: (i) an increase of pore pressure induces a dilation of the rock; and (ii) compression of the rock causes a rise of pore pressure, if the fluid is prevented from escaping the pore network. These coupled mechanisms bestow an apparent tim...
763 CitationsSource
#1Jean-Pierre Bardet (SC: University of Southern California)H-Index: 25
#2H. Sayed (SC: University of Southern California)H-Index: 1
Abstract Based on the two-phase theory of Biot, we present exact and approximate expressions for the velocity and attenuation of compressional waves within nearly saturated poroelastic media. We use the approximate solutions to model the low-frequency compressional waves within nearly saturated soils. The model accounts for the effective stress, degree of saturation, and void ratio, and is capable of describing experimental results on Ottawa sand. The three-phase theory of Vardoulakis and Beskos...
36 CitationsSource
The pore pressure response of saturated porous rock subjected to undrained compression at low effective stresses are investigated theoretically and experimentally. This behavior is quantified by the undrained pore pressure buildup coefficient, B=(dPf/dPc)|dmf=0, where Pf is fluid pressure, Pc is confining pressure, and mf is the mass of fluid per unit bulk volume. The measured values for B for three sandstones and a dolomite arc near 1.0 at zero effective stress and decrease with increasing effe...
134 CitationsSource
#1Ioannis Vardoulakis (UMN: University of Minnesota)H-Index: 46
#2Dimitri E. Beskos (University of Patras)H-Index: 56
Abstract The field and constitutive equations expressing the dynamic behavior of a partially saturated porous medium considered as a solid-fluid-gas system are developed. The corresponding governing equations are then constructed and subsequently linearized to form a system of 11 partial differential equations with 11 unknowns. This system is reduced to 7 equations with 7 unknowns for the special case of the nearly saturated porous medium. The various phenomenological coefficients of the theory ...
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Cited By6
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#1Jean-Baptiste Tary (University of Los Andes)H-Index: 12
#2Louis Géli ('IFREMER': IFREMER)H-Index: 28
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Abstract The Sea of Marmara (SoM) is a marine portion of the North Anatolian Fault (NAF) and a portion of this fault that did not break during its 20th century earthquake sequence. The NAF in the SoM is characterized by both significant seismic activity and widespread fluid manifestations. These fluids have both shallow and deep origins in different parts of the SoM and are often associated with the trace of the NAF which seems to act as a conduit. On July 25th, 2011, a M w 5 strike-slip earthqu...
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#1Ludovic Räss (UNIL: University of Lausanne)H-Index: 8
#2Roman Y. Makhnenko (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
Last. Lyesse Laloui (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 52
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Abstract In the light of growing concerns for the climate change, it is of particular interest for governments to encourage efficient capture and safe storage of large amounts of carbon dioxide in the subsurface. In this perspective and in order to accurately predict the short and long-term response of the reservoir, a precise characterization of the geomechanical properties has to be carried out. In addition to the classical poroelastic properties, time-dependent deformation, such as viscous cr...
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#1Roman Y. Makhnenko (UMN: University of Minnesota)H-Index: 12
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
In situ rock is often saturated with fluid, the presence of which affects both elastic parameters and inelastic deformation processes. Techniques were developed for testing fluid-saturated porous rock under the limiting conditions of drained (long-term), undrained (short-term) and unjacketed (solid matrix) response in hydrostatic, axisymmetric and plane-strain compression. Drained and undrained poroelastic parameters, including bulk modulus, Biot and Skempton coefficients, of Berea sandstone wer...
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#1Roman Y. Makhnenko (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
The presence of pore fluid in rock affects both the elastic and inelastic deformation processes, yet laboratory testing is typically performed on dry material even though in situ the rock is often saturated. Techniques were developed for testing fluid-saturated porous rock under the limiting conditions of drained, undrained, and unjacketed response. Confined compression experiments, both conventional triaxial and plane strain, were performed on water-saturated Berea sandstone to investigate poro...
17 CitationsSource
th US Rock Mechanics / Geomechanics Symposium held in Minneapolis, MN, USA, 1-4 June 2014. This paper was selected for presentation at the symposium by an ARMA Technical Program Committee based on a technical and critical review of the paper by a minimum of two technical reviewers. The material, as presented, does not necessarily reflect any position of ARMA, its officers, or members. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the ...
#1R. M. Makhnenko (UMN: University of Minnesota)H-Index: 1
#2Joseph F. LabuzH-Index: 32
The unjacketed bulk modulus of sandstone, Ks′, is often considered to be equal to the bulk modulus of quartz, the main mineral which forms it. However, preliminary tests and some other works show that for Berea sandstone this assumption might be violated. Three different types of laboratory experiments were
10 CitationsSource