The influence of fluids on grain contact stiffness and frame moduli in sedimentary rocks

Tutuncu, Azra N.; Sharma, Mukul M.

doi:10.1190/1.1443225

Cited by 89 publications

(30 citation statements)

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“…To remedy this situation, a number of researchers [e.g., Stoll, 1983;Chotiros, 1995;Williams, 2001;Williams et al, 2002] have studied models based on the Biot theory of poroelasticity [Biot, 1956a[Biot, , 1956b. Extensions have been made to these models to account for grain contact [Biot, 1962;Tutuncu and Sharma, 1992], stick-slip phenomena [Buckingham, 1997[Buckingham, , 2005, and ''squirt flow'' [Murphy et al, 1986;Dvorkin and Nur, 1993]. While traditional acoustical methods have had difficulty distinguishing experimentally among the predictions of these competing theories, only poroelastic media are capable of generating a macroscopic, EK response.…”

Section: Introductionmentioning

confidence: 99%

Conductivity dependence of seismoelectric wave phenomena in fluid‐saturated sediments

Block¹,

Harris²

2006

J. Geophys. Res.

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[1] Seismoelectric phenomena in sediments arise from acoustic wave-induced fluid motion in the pore space, which perturbs the electrostatic equilibrium of the electric double layer on the grain surfaces. Experimental techniques and the apparatus built to study the conductivity dependence of the electrokinetic (EK) effect are described, and outcomes for studies in loose glass microspheres and medium-grain sand are presented. By varying the NaCl concentration in the pore fluid, we measured the conductivity dependence of two kinds of EK behavior: (1) the electric fields generated within the samples by the passage of transmitted acoustic waves and (2) the electromagnetic waves produced at the fluid-sediment interface by the incident acoustic wave. Both phenomena are caused by relative fluid motion in the sediment pores; this feature is characteristic of poroelastic (Biot) media but is not predicted by either viscoelastic fluid or solid models. A model of plane wave reflection from a fluid-sediment interface using EK-Biot theory leads to theoretical predictions that compare well to the experimental data for both loose glass microspheres and medium-grain sand.Citation: Block, G. I., and J. G. Harris (2006), Conductivity dependence of seismoelectric wave phenomena in fluid-saturated sediments,

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Section: Introductionmentioning

confidence: 99%

Conductivity dependence of seismoelectric wave phenomena in fluid‐saturated sediments

Block¹,

Harris²

2006

J. Geophys. Res.

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“…al. (1987), Tutuncu and Sharma (1992) Thermo-Relaxation Savage ( I 966), Kjartansson ( I 979), Amstrong ( I 980) Walsh (1968), Walsh (1969, O'Connell and Budiansky (1977) …”

Section: Proposed Attenuation Mechanisms In Granular Media and Associmentioning

confidence: 99%

“…The concept, however, has been used to successfully interpret laboratory results (Spencer, 1981;Winkler, 1985;Mavko and Jizba, 1991). Recent work by Tutuncu and Sharma (1992) has suggested that inclusion of fluid surface forces improves the estimation of attenuation.…”

Section: Squirt Fluid Flow Attenuationmentioning

confidence: 99%

Contact micromechanics in granular media with clay

Ita

1994

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“…Since the samples are dry, we know that the attenuation is not related to any wave-induced fluid motion, although it might be related in part to surface forces (see, for example, Tutuncu, -11 1992, andTutuncu andSharma, 1992). We suspect that scattering from the fractures is the dominant mechanism of the attenuation.…”

Section: A-10mentioning

confidence: 99%

Multi-Attribute Seismic/Rock Physics Approach to Characterizing Fractured Reservoirs

Mavko¹

2000

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JUSTIFICATIONDuring Phase I, we performed our rock physics, geologic, and seismic feasibility analysis for fracture characterization. We addressed the problem of seismic fracture detection and characterization, in general, and specifically at our field site in West Texas. In this analysis, we were able to implement a number of fracture modeling procedures and to quantitatively assess the theoretical detectability of reservoir fractures. This allowed us to identify which of the several seismic attributes are most likely to be useful for fracture detection at the site. One of our results showed that Thomsen's parameters should be very useful for indicating gas-filled fractures at the site. We also outlined Monte Carlo approaches that can be applied for feasibility analysis at any site.Prior to our study, most seismic fracture detection methods have focused on qualitatively detecting seismic anisotropy. While anisotropy is critical, when used alone it has left us with interpretation ambiguities and nonuniqueness. During Phase 1 of this project, we found that by statistically integrating geologic and seismic information we can develop nontraditional methods for fracture detection. For example, we found that quantifying the correlations between fracture occurrence and depositional environment, and between fracture spacing and layer thickness, we allow us to decrease the uncertainty of fracture interpretation using seismic anisotropy. One of the reasons for this is that different depositional environments (and rock facies) give rise to differences in their seismic signatures (impedances, velocities, and Poisson's ratio.Phase II will allow us to validate and improve these methodologies by carrying out a smallscale field pilot study. Taking methods to the field, always allows us to make them more applicable. In the field, we will be able to more accurately assess the uncertainties introduced by measurement noise, source and receiver response, coupling, and near surface acoustic properties. We can then more realistically develop ways to reduce the uncertainty, as well as to identify which aspects of the geology and fracture distribution we can characterize most robustly. The small-scale field study will also help us to establish empirical fracture parameters that are needed as inputs to rock physics models. For example, ALL of the effective medium models for fracture-induced anisotropy require fracture stiffness as inputs (these are sometimes characterized as moduli or aspect ratios). There is no realistic way to assign these values DOE FINAL TECHNICAL REPORT ON PHASE 4 theoretically, so being able to calibrate them in a small pilot will give us the critical inputs we need for interpreting the full scale seismic survey in phase III. Finally, the data from the pilot will allow us to add an aspect of "data mining" to the study. In Phase I, we have exploited our best theoretical tools, but the real field data will give us the opportunity to discover other, unpredicted, signatures of fractures that might prove valuable.Our a...

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The influence of fluids on grain contact stiffness and frame moduli in sedimentary rocks

Cited by 89 publications

References 0 publications

Conductivity dependence of seismoelectric wave phenomena in fluid‐saturated sediments

Conductivity dependence of seismoelectric wave phenomena in fluid‐saturated sediments

Contact micromechanics in granular media with clay

Multi-Attribute Seismic/Rock Physics Approach to Characterizing Fractured Reservoirs

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