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Title: Seismic signatures of reservoir transport properties and pore fluid distribution

Abstract

The authors 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. They consider wave-induced squirt fluid flow at two scales: (1) local microscopic flow at the smallest scale of saturation heterogeneity (e.g., within a single pore) and (2) macroscopic flow at a larger scale of fluid-saturated and dry patches. They explore the circumstances under which each of these mechanisms prevails. They examine such flows under the conditions of uniform confining (bulk) compression and obtain the effective dynamic bulk modulus of rock. The solutions are formulated in terms of generalized frequencies that depend on frequency, saturation, fluid and gas properties, and on the macroscopic properties of rock such as permeability, porosity, and dry bulk modulus. The study includes the whole range of saturation and frequency; therefore, the authors provide the missing link between the low-frequency limit and the high-frequency limit given by Mavko and Jizba. Further, they compare their model with Biot's theory and introduce a geometrical factor whose numeric value gives an indication as to whether local fluid squirt or global mechanismsmore » dominate the viscoelastic properties of porous materials. The important results of their theoretical modeling are: (1) a hysteresis of acoustic velocity versus saturation resulting from variations in fluid distributions, and (2) two peaks of acoustic wave attenuation--one at low frequency and another at higher frequency (caused by local flow). Both theoretical results are compared with experimental data.« less

Authors:
 [1]; ; ;  [2]
  1. Saudi Aramco, Dhahran (Saudi Arabia)
  2. Stanford Univ., CA (United States). Dept. of Geophysics
Publication Date:
OSTI Identifier:
7091430
Resource Type:
Journal Article
Journal Name:
Geophysics; (United States)
Additional Journal Information:
Journal Volume: 59:8; Journal ID: ISSN 0016-8033
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; 58 GEOSCIENCES; NATURAL GAS DEPOSITS; SEISMIC SURVEYS; PETROLEUM DEPOSITS; RESERVOIR ROCK; FLUID FLOW; MICROSTRUCTURE; DATA ANALYSIS; ELASTICITY; PERMEABILITY; POROSITY; RESPONSE FUNCTIONS; SEISMIC WAVES; FUNCTIONS; GEOLOGIC DEPOSITS; GEOPHYSICAL SURVEYS; MECHANICAL PROPERTIES; MINERAL RESOURCES; RESOURCES; SURVEYS; TENSILE PROPERTIES; 020200* - Petroleum- Reserves, Geology, & Exploration; 030200 - Natural Gas- Reserves, Geology, & Exploration; 580000 - Geosciences

Citation Formats

Akbar, N, Mavko, G, Nur, A, and Dvorkin, J. Seismic signatures of reservoir transport properties and pore fluid distribution. United States: N. p., 1994. Web. doi:10.1190/1.1443680.
Akbar, N, Mavko, G, Nur, A, & Dvorkin, J. Seismic signatures of reservoir transport properties and pore fluid distribution. United States. https://doi.org/10.1190/1.1443680
Akbar, N, Mavko, G, Nur, A, and Dvorkin, J. Mon . "Seismic signatures of reservoir transport properties and pore fluid distribution". United States. https://doi.org/10.1190/1.1443680.
@article{osti_7091430,
title = {Seismic signatures of reservoir transport properties and pore fluid distribution},
author = {Akbar, N and Mavko, G and Nur, A and Dvorkin, J},
abstractNote = {The authors 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. They consider wave-induced squirt fluid flow at two scales: (1) local microscopic flow at the smallest scale of saturation heterogeneity (e.g., within a single pore) and (2) macroscopic flow at a larger scale of fluid-saturated and dry patches. They explore the circumstances under which each of these mechanisms prevails. They examine such flows under the conditions of uniform confining (bulk) compression and obtain the effective dynamic bulk modulus of rock. The solutions are formulated in terms of generalized frequencies that depend on frequency, saturation, fluid and gas properties, and on the macroscopic properties of rock such as permeability, porosity, and dry bulk modulus. The study includes the whole range of saturation and frequency; therefore, the authors provide the missing link between the low-frequency limit and the high-frequency limit given by Mavko and Jizba. Further, they compare their model with Biot's theory and introduce a geometrical factor whose numeric value gives an indication as to whether local fluid squirt or global mechanisms dominate the viscoelastic properties of porous materials. The important results of their theoretical modeling are: (1) a hysteresis of acoustic velocity versus saturation resulting from variations in fluid distributions, and (2) two peaks of acoustic wave attenuation--one at low frequency and another at higher frequency (caused by local flow). Both theoretical results are compared with experimental data.},
doi = {10.1190/1.1443680},
url = {https://www.osti.gov/biblio/7091430}, journal = {Geophysics; (United States)},
issn = {0016-8033},
number = ,
volume = 59:8,
place = {United States},
year = {1994},
month = {8}
}