Permeability Estimation from Field Data
Name
1987.6 Burns et al.pdf
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Author(s)
Burns, D. R.
Cheng, C. H.
Schmitt, D. P.
Toksoz, M. N.
Date Issued
1987
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;1987-06
Abstract
Strong correlations exist between core measured permeability values and the phase velocity and attenuation of the tube wave obtained from full waveform acoustic logs.
A number of authors have applied the Biot theory to the borehole wave propagation
problem in order to explain the observed correlations with reasonably good success. In
this paper we present two methods of estimating the absolute in-situ permeability from
acoustic log data. Comparisons between measured tube wave velocity and attenuation
and model predictions indicate that the Rosenbaum formulation of the Biot model can
explain most of the tube wave attenuation data. Based on these findings, an inverse
problem is formulated to estimate in-situ permeability from tube wave attenuation measurements using the Biot-Rosenbaum model. Resulting permeability estimates from two
field data sets are in agreement with smoothed core permeability measurements. A second
estimation method is based on tube wave velocity measurements. By taking the
difference between the measured tube wave travel time and the calculated elastic travel
time, a new measure is obtained which is referred to as the AAT value. A cross plot
of logarithmic core permeability values versus AAT values for data from two different
lithologies gives an excellent linear trend for the permeability range of 0.1 to 2000
millidarcies.
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