Fast Inversion Of Formation Permeability From Stoneley Wave Logs Using A Simplified Blot-Rosenbaum Model
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1994.8 Tang_Cheng.pdf
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Author(s)
Tang, X. M.
Cheng, C. H.
Date Issued
1994
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;1994-08
Abstract
This paper describes a fast algorithm for estimating formation permeability from Stoneley
wave logs. The procedure uses a simplified Biot-Rosenbaum model formulation. The
input to the inversion is the Stoneley wave spectral amplitudes at each depth and receiver, the borehole fluid properties (velocity and density), the borehole caliper log,
the formation density and porosity (from log data), and the compressional and shear
velocities for the interval of interest. The model uses the borehole caliper and elastic
properties to compute the Stoneley wave excitation (that is, predicted amplitude without
permeability effects) as a function of frequency, and the porosity and permeability
to compute the fluid flow amplitude reduction. This method also uses a reference depth
of known permeability and compares amplitude variations at other depths relative to
the reference depth. The permeability value obtained from the inversion represents the
best fit over all receivers and all relevant frequencies. A processing example is shown
to demonstrate the ability of this technique to extract formation permeability from
Stoneley wave logs.
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