Prerequisites to complex use of standard and acoustic logging for the forecast of a Poisson's ratio

UDK: 550.832
Authors: M.V. Chertenkov, L.M. Ruzin (LUKOIL-Engineering LLC, RF, Moscow)

Now more and more attention is paid to creation of geomechanical models, key parameter in model is Poisson's coefficient. There are several approaches to measurement of coefficient of Poisson: acoustic and mechanical core researches, acoustic well logging, seismic researches. Each of the listed methods has the advantages and disadvantages. Core researches have and disadvantages as the researched sample is taken from a natural environment and often there passes the considerable period of time between an extraction and a research. According to Authors the most representative for use in geomechanical model is acoustic borehole researches. In the conditions of a well the researched intervals are in the loaded condition close to a natural and acoustic researches can show change of physical parameters (speeds of waves). Acoustic researches of coefficient of Poisson have also errors as for its obtaining used reexact formulas, besides acoustic logging has the small depth of a research. In our opinion use of acoustic well logging will bring minimum of possible mistakes in determination of coefficient of Poisson.

However, realities are that that measurement of coefficient of Poisson by means of acoustic methods in the large volume of wells often isn't reasonable from the economic point of view. This article is devoted to approaches to forecasting of this parameter on the basis of a standard logging complex. As it was shown on the example of the Uryevskoye field use of the given approaches allows to obtain large volume of borehole data without obtaining to a big mistake in the determined parameters. Certainly, use of similar approaches can't replace large-scale acoustic researches.

References

1. Winkler K.W., Liu H.-L., Johnson D.L., Permeability and borehole Stoneley

waves: Comparison between experiment and theory, Geophysics, 1989,

V. 54,no. 1, pp. 66-75.

2. Norris A.N., Stoneley-wave attenuation and dispersion in permeable formations,

Geophysics, 1989, V. 54, no. 3, pp. 330-341.



Now more and more attention is paid to creation of geomechanical models, key parameter in model is Poisson's coefficient. There are several approaches to measurement of coefficient of Poisson: acoustic and mechanical core researches, acoustic well logging, seismic researches. Each of the listed methods has the advantages and disadvantages. Core researches have and disadvantages as the researched sample is taken from a natural environment and often there passes the considerable period of time between an extraction and a research. According to Authors the most representative for use in geomechanical model is acoustic borehole researches. In the conditions of a well the researched intervals are in the loaded condition close to a natural and acoustic researches can show change of physical parameters (speeds of waves). Acoustic researches of coefficient of Poisson have also errors as for its obtaining used reexact formulas, besides acoustic logging has the small depth of a research. In our opinion use of acoustic well logging will bring minimum of possible mistakes in determination of coefficient of Poisson.

However, realities are that that measurement of coefficient of Poisson by means of acoustic methods in the large volume of wells often isn't reasonable from the economic point of view. This article is devoted to approaches to forecasting of this parameter on the basis of a standard logging complex. As it was shown on the example of the Uryevskoye field use of the given approaches allows to obtain large volume of borehole data without obtaining to a big mistake in the determined parameters. Certainly, use of similar approaches can't replace large-scale acoustic researches.

References

1. Winkler K.W., Liu H.-L., Johnson D.L., Permeability and borehole Stoneley

waves: Comparison between experiment and theory, Geophysics, 1989,

V. 54,no. 1, pp. 66-75.

2. Norris A.N., Stoneley-wave attenuation and dispersion in permeable formations,

Geophysics, 1989, V. 54, no. 3, pp. 330-341.





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