Comparison of slowness estimation methods according to borehole acoustic waveform data

Authors: V.E. Kosarev, V.A. Gorgun, O.N. Sherstyukov (Kazan (Volga Region) Federal University, RF, Kazan), V.N. Gorbachev, M.L. Mikheev (TNG-Group LTD, RF, Bugulma)

Key words: acoustic logging, Semblance’s method, hodograph curve, dispersion, convergence, error in slowness determination

Methods for estimating the slowness of elastic waves according to a multi-element acoustic logging are discusses in the paper. Compare slowness curves of longitudinal and transverse waves for carbonate deposits is held. Interval times curves estimated by Semblance and dispersion methods have better convergence with each other. The reason for this is that these methods estimate the group velocity, as opposed to the hodograph method, which gives an estimate of the phase velocity. Convergence of slowness curves for the transverse wave is generally belter than convergence of curves for the longitudinal wave. All methods yield similar values slowness estimation errors.
References
1. URL: http://npf-geofizika.ru/?part_id=41,54,107& obj_id=481.
2. URL: http://www.slb.com/~/media/Files/evaluation/ product_sheets/wireline_ open_hole/petrophysics/acoustic/dsi.pdf.
3. Bulatova Zh.M., Volkova E.A., Dubrov E.F., Akusticheskiy karotazh (Fcoustic logging), Leningrad: Nedra Publ., 1970, 264 p.
4. Ellis D.V., Singer J.M.,Well logging for Earth scientists, Springer, 2008, 699 p.
5. Patent US 7,675,813 B2, Methods and systems for detecting arrivals of interest, Inventors: Valero H.-P., Kanagawa-Ken M.T, 2010.
6. Patent US 4,853,903, Method and apparatus for removing sinusoidal noise
from seismic data, Inventors: Linville A.F., Shirley T.E., Griffith P.G., 1988.
7. Kimball, C.V., Marzetta T.L., Semblance processing of borehole acoustic
array data, Geophysics, 1986, V. 49, pp. 274-281.
8. Tang X.M., Gheng A., Quantitative borehole acoustic methods, In:
Handbook of geophysical exploration: Seismic exploration (V. 24), Elsever,
2004, 255 p.
9. Gorgun V.A., Utemov E.V., Kosarev V.E., The dispersion method for determining the interval velocity according to a multielement wave acoustic logging (In Russ.), Georesursy = Georesources, 2011, no. 6 (42), pp. 44-47
10. Latysheva M.G., D'yakonova T.F., Tsirul'nikov V.P., Dostovernost' geofizicheskoy i geologicheskoy informatsii pri podschete zapasov nefti i gaza (The reliability of the geological and geophysical data in the calculation of oil and gas reserves), Moscow: Nedra Publ., 1986, 121 p.

Key words: acoustic logging, Semblance’s method, hodograph curve, dispersion, convergence, error in slowness determination

Methods for estimating the slowness of elastic waves according to a multi-element acoustic logging are discusses in the paper. Compare slowness curves of longitudinal and transverse waves for carbonate deposits is held. Interval times curves estimated by Semblance and dispersion methods have better convergence with each other. The reason for this is that these methods estimate the group velocity, as opposed to the hodograph method, which gives an estimate of the phase velocity. Convergence of slowness curves for the transverse wave is generally belter than convergence of curves for the longitudinal wave. All methods yield similar values slowness estimation errors.
References
1. URL: http://npf-geofizika.ru/?part_id=41,54,107& obj_id=481.
2. URL: http://www.slb.com/~/media/Files/evaluation/ product_sheets/wireline_ open_hole/petrophysics/acoustic/dsi.pdf.
3. Bulatova Zh.M., Volkova E.A., Dubrov E.F., Akusticheskiy karotazh (Fcoustic logging), Leningrad: Nedra Publ., 1970, 264 p.
4. Ellis D.V., Singer J.M.,Well logging for Earth scientists, Springer, 2008, 699 p.
5. Patent US 7,675,813 B2, Methods and systems for detecting arrivals of interest, Inventors: Valero H.-P., Kanagawa-Ken M.T, 2010.
6. Patent US 4,853,903, Method and apparatus for removing sinusoidal noise
from seismic data, Inventors: Linville A.F., Shirley T.E., Griffith P.G., 1988.
7. Kimball, C.V., Marzetta T.L., Semblance processing of borehole acoustic
array data, Geophysics, 1986, V. 49, pp. 274-281.
8. Tang X.M., Gheng A., Quantitative borehole acoustic methods, In:
Handbook of geophysical exploration: Seismic exploration (V. 24), Elsever,
2004, 255 p.
9. Gorgun V.A., Utemov E.V., Kosarev V.E., The dispersion method for determining the interval velocity according to a multielement wave acoustic logging (In Russ.), Georesursy = Georesources, 2011, no. 6 (42), pp. 44-47
10. Latysheva M.G., D'yakonova T.F., Tsirul'nikov V.P., Dostovernost' geofizicheskoy i geologicheskoy informatsii pri podschete zapasov nefti i gaza (The reliability of the geological and geophysical data in the calculation of oil and gas reserves), Moscow: Nedra Publ., 1986, 121 p.


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