Elastic parameters of rocks from well logging in near surface sediments

• Autorzy: Jarzyna J. , Bała M. , Cichy A.
• Języki publikacji: EN

Abstrakty

EN

Acoustic full waveforms recorded in wells are the simplest way to get the velocity of P, S, and Stoneley waves in situ. Processing and interpretation of acoustic full waveforms in hard formations does not generate problems with identification packets of waves and calculation of their slowness and arrivals, and determination of the elastic parameter of rocks. But in shallow intervals of wells, in soft formations, some difficulties arise with proper evaluation of the S-wave velocity due to the lack of refracted S wave in case when its velocity is lower than the velocity of mud. Dynamic approach to selection of a proper value of semblance to determine the proper slowness and arrival is presented. Correlation between the results obtained from the proposed approach and the theoretical modeling is a measure of the correctness of the method.

Słowa kluczowe

EN

acoustic full waveforms; velocity of elastic waves; rock formation in situ

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2010
• Tom: Vol. 58, no. 1
• Strony: 34--48
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Jarzyna J.

autor

Bała M.

autor

Cichy A.

• AGH University of Science and Technology, Faculty of Geology Geophysics and Environmental Protection, Kraków, Poland,

Bibliografia

• Bała, M., and A. Cichy (2007), Comparison of P- and S-waves velocities estimated from Biot Gassmann and Kuster–Toksöz models with results obtained from acoustic wavetrains interpretation, Acta Geophys. 55, 2, 222-230.
• Biot, M.A. (1962), Mechanics of deformation and acoustic propagation in Poros media, J. Appl. Phys. 33, 4, 1482-1498.
• Gassmann, F. (1951), Elastic waves through a pacing of spheres, Geophysics 16, 4, 673-685.
• Jarzyna, J., M. Bała, A. Cichy, W. Gądek, I. Gąsior, J. Karczewski, K. Marzencki, M. Stadtműller, W. Twaróg, and T. Zorski (2002), GeoWin – System for processing and interpretation of well logging. In: Proc. 8th Conference and Exhibition of EEGS-European Section, Aveiro, Portugal, Sept. 8-12, 2002 (CD only).
• Kimball, Ch.V., and T.L. Marzetta (1984), Semblance processing of borehole acoustic array data, Geophysics 49, 3, 247-281.
• Kuster, G.T., and M.N. Toksöz (1974), Velocity and attenuation of seismic waves in two-phase media. Part I: Theoretical formulations, Geophysics 39, 587-606.
• Liu, O.Y. (1984), Stoneley derived ΔT shear log. In: Proc. 25th Annual Logging Symposium of Society of Professional Well Log Analysts, Houston, TX, June 10-13, 1984, paper ZZ.
• Myśliwiec, M. (2004), The Miocene reservoir rocks of the Carpathian Foredeep, Prz. Geol. 52, 581-592 (in Polish with summary in English).