Seismic signatures of reservoir transport properties and pore fluid distribution

  title={Seismic signatures of reservoir transport properties and pore fluid distribution},
  author={N. Akbar and G. Mavko and A. Nur and J. Dvorkin},
We investigate the effects of permeability, frequency, and fluid distribution on the viscoelastic behavior of rock. The viscoelastic response of rock to seismic waves depends on the relative motion of pore fluid with respect to the solid phase. Fluid motion depends, in part, on the internal wave‐induced pore pressure distribution that relates to the pore micro‐structure of rock and the scales of saturation. We consider wave‐induced squirt fluid flow at two scales: (1) local microscopic flow at… Expand
Elastic wave velocities in partially saturated rocks: Saturation hysteresis
An effective medium approach (differential self-consistent scheme) has been used to calculate elastic wave velocities in rocks containing spherical pores and ellipsoidal cracks with two fluid phases.Expand
Computational rock physics: wave propagation velocities in partially saturated rocks
Summary The effect of single-phase fluid saturation on the seismic bulk modulus of a rock is well understood; however, the behavior becomes more complex when multiple fluids are present. SeveralExpand
Bounds on low‐frequency seismic velocities in partially saturated rocks
The most common technique for estimating seismic velocities in rocks with mixed pore fluid saturations is to use Gassmann’s relations with an effective fluid whose density and compressibility areExpand
Effects of pore fluids in the subsurface on ultrasonic wave propagation
This thesis investigates ultrasonic wave propagation in unconsolidated sands in the presence of different pore fluids. Laboratory experiments have been conducted in the sub-MHz range using quartzExpand
Absorption of strain waves in porous media at seismic frequencies
An understanding of strain wave propagation in fluid containing porous rocks is important in reservoir geophysics and in the monitoring in underground water in the vicinity of nuclear and toxic wasteExpand
Pore-Scale Simulation Of Experimentally Realizable, Oscillatory Flow In Porous Rock
We report new simulations of oscillating flow in porous rock. Our goal is to better understand the frequency dependence of pore-scale fluid motion, which should ultimately help us to interpretExpand
Analysis of multiscale scattering and poroelastic attenuation in a real sedimentary rock sequence
  • Hackert, Parra
  • Geology, Medicine
  • The Journal of the Acoustical Society of America
  • 2000
The results suggest that a high permeability network of sediments or fractures in a lower permeability host rock may have a distinct separable attenuation signature, even if the overall volume of high permeable material is low. Expand
Impact of flow-simulation parameters on saturation scales and seismic velocity
Scales of fluid saturation below seismic resolution introduce uncertainties in the interpretation of seismic velocity. A “coarse‐scale” or “patchy” distribution always has a higher effective seismicExpand
Influence of fluid chemistry on shear-wave attenuation and velocity in sedimentary rocks
SUMMARY Measurements of shear-wave attenuation Qs−1 and velocity Vs were made in a sample of Massilon sandstone and a sample of Brauvilliers oolitic limestone in the kilohertz frequency rangeExpand
Elastic modeling of seismic wave propagation in partially saturated rocks
Summary The effect of single-phase fluid saturation on a rock’s bulk modulus is well understood using Gassmann’s equation. However when multiple fluids are involved the behaviour is not as wellExpand


The influence of saturation by water, oil, gas, and mixtures of these fluids on the densities, velocities, reflection coefficients, and elastic moduli of consolidated sedimentary rocks was determinedExpand
Pore fluids and frequency‐dependent wave propagation in rocks
Attenuation is the anelastic process which dissipates seismic energy by conversion to heat, thus decreasing the amplitude and modifying the frequency and phase content of a propagating wavelet.Expand
Dynamic poroelasticity: A unified model with the squirt and the Biot mechanisms
The velocities and attenuation of seismic and acoustic waves in rocks with fluids are affected by the two most important modes of fluid/solid interaction: (1) the Biot mechanism where the fluid isExpand
Seismic attenuation: Effects of pore fluids and frictional-sliding
Seismic wave attenuation in rocks was studied experimentally, with particular attention focused on frictional sliding and fluid flow mechanisms. Sandstone bars were resonated at frequencies from 500Expand
Estimating grain-scale fluid effects on velocity dispersion in rocks
The magnitude of the grain‐scale local flow effect on velocity dispersion in saturated rocks is quantified, by estimating the high‐frequency unrelaxed shear and bulk frame moduli, which are thenExpand
Viscoelastic properties of fluid-saturated cracked solids
The effective elastic moduli of a fluid-saturated solid containing thin cracks depend on the degree of interconnection between the cracks. Three separate regimes may be identified: (1) dry (drained),Expand
Sample boundary effect in acoustic attenuation of fluid‐saturated porous cylinders
It was shown previously, by using Biot theory, that there exists an attenuation in the low‐frequency elastic modulus measurement on fluid‐saturated porous rock cylinders caused by the open‐poreExpand
A laboratory study of the dependence of elastic wave velocities on pore scale fluid distribution
Laboratory data have been collected during a continuous imbibition/drainage experiment that show a clear dependence of elastic wave velocities on the details of the pore scale distribution of waterExpand
Bulk elastic wave propagation in partially saturated porous solids
The linear equations of motion that describe the behavior of small disturbances in a porous solid containing both liquid and gas are solved for bulk wave propagation. The equations have beenExpand
Relationships among compressional wave attenuation, porosity, clay content, and permeability in sandstones
Anelastic attenuation is the process by which rocks convert compressional waves into heat and thereby modify the amplitude and phase of the waves. Understanding the causes of compressional waveExpand