Combination of Core and Log Data for the Prediction of Compressional Wave Velocities in Carbonate Rocks

Document Type : Research Paper

Authors

Research Institute of Petroleum Industry (RIPI)

Abstract

The relation between compressional wave velocity and porosity depends on porosity, porosity type, mineralogy, saturation, and pressure in carbonate rock. Therefore, data points are scattered in a velocity-porosity cross plot. In this study, two methods of rock typing in carbonate rocks are analyzed to investigate the relation between compressional wave velocity and porosity. For this purpose, flow zone indicators and velocity deviation values are used. Flow zone indicators are determined from differences between sonic velocity and the velocity obtained from Wyllie time average equation using neutron porosity. The results show four hydraulic flow units with flow zone indicators from 2.23 to 19.95 and four rock types based on velocity deviation values from 139 to 1135 (m/s). Moreover, the results show that the rock typing based on velocity deviation values is more accurate than that obtained by flow zone indicators. The average value of correlation coefficient is 95% for grouping based on velocity deviation values, whereas this value is 67% for grouping based on flow zone indicators.

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References

منابع
[1]. Wyllie M. R. J., Gregory, A. R., and Gardner, L. W., “Elastic wave velocities in heterogeneous and porous media”, Geophysics, Vol. 21, pp. 41-70, 1956.
[2]. Pickett G.R., “Acoustic character logs and their application in formation evaluation”, Trans. AIME, Vol. 15, pp. 659-667, 1963.
[3]. Raiga-Clemenceau J., Martine J. P., and Nicoletis S., “The concept of acoustic formation factor for more accurate porosity determination from sonic transit time data”, The Log Analyst (Jan – Feb.), pp. 54-59, 1986.
[4]. Anselmetti F. S., and Eberli G. P., “Controls on sonic velocity in carbonate rocks”, Pure and Applied Geophysics, Vol. 141, pp. 287- 323, 1993.
[5]. Eberli G. P., Anselmetti F. S., and Incze M. L., Factors controlling elastic properties in carbonate sediments and rocks, The Leading Edge, pp. 654-660, 2003.
[6]. Walsh J., “The effect of cracks on the compressibility of rocks”, Geophysics Res., Vol. 70, pp. 381-389, 1965.
[7]. Amaefule J. O., Altunbay M., Tiab D., Kersey D.G., and Kedan D.k., “Enhanced reservoir description: Using core and log data to identify hydraulic (flow) unites and predict permeability in uncored intervals/wells”, SPE paper No. 26436, Presented at 68th Annual Technical Conference and Exhibition Houston, Tx., 1993.
[8]. Kozeny J., “Uber kapillare leitung des wassers im boden”, stiuzurgsberichte, Royal Academy od Science, Vienna, Proc. Class1, Vol. 136, pp. 271-306, 1927.
[9]. Carman P. C., “Fluid flow through granular beds”, Trans AICHE, Vol. 15, pp. 150-166, 1937.
Journal of Petroleum Research
Volume 22, Issue 71 - Serial Number 71
November and December 2012
Pages 57-65

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