Detecting and characterizing fractures in sedimentary deposits with stoneley waves

  • Carlos Escandón Universidad Nacional de Colombia, Bogotá ,Colombia
  • Luis Montes Universidad Nacional de Colombia, Bogotá ,Colombia
Keywords: Deposits, Fractures, Waves, Permeability, Sonic log, Llanos foothills

Abstract

The naturally fractured reservoirs are attractive potential zones for a successful hydrocarbon prospecting, and the variable density logs (VDL) with Chevron patterns generated by Stoneley waves is a suited tool to characterize fractures. In this project, a simplified algorithm to evaluate fracture location using reflection coefficients and analysis of attenuation was implemented. It also uses a permeability indicator (Stoneley Slowness added by Permeability) to discriminate permeability in fractures.
The algorithm was tested in a foot hill well of the Colombian west range, detecting a previously known fractured sandstone zone and indicating its permeability. Besides, the algorithm detected other existent fractures zones with low permeability for production. Previous well flow evaluation of the localized fractures characterized them as low or no permeability fractures.

References

Biot, M. A. (1956). Theory of propagation of elastic waves in a fluid saturated porous solid. I. Low frequency range. J. of Accoustical Soc. of America, 28, 168-178.

Biot, M. A. (1962). Mechanics of deformation and acoustic propagation in porous media. J. of Applied Physics, 33, 1482-1498.

Brown, P., Batzle, M., Dey-Sakar, S., & Peeters, M. (2000). Shock Tube Experiments and observation of the slow Biot wave in natural rocks, SEG, 70th Annual
conference. Calgary. 6-11-August.

Chang, S. K., Liu, H. L., & Johnson, D. L. (1988). Low frequency tube waves in permeable rocks, Geophysics, 53, 519-527.

Cheng-Chuen, & Toksoz, M. (1981). Elastic wave propagation in a fluid filled borehole and synthetic acoustic logs, Geophysics, 46, 1042-1053.

Cheng, C. H., Zhang, J., & Burns, D. R. (1987). Effects of in situ permeability on the propagation of Stoneley wave in a borehole, Geophysics, 52, 1279-1289.

Endo, T., Ito, H., Brie, A., Badri, M., & El Sheikh, M. (1997). Fracture and permeability evaluation in a fault zone from sonic waveform data, in Transactions of the SPWLA (Society of Professional Well Log Analysts). Paper R. 13. Thirty-Eighth Annual Logging Symposium, Houston, Tex.: Society of Professional Well Log Analysts, June 15-18.

Hornby, B. E., Johnson, D. L., Winkler, K. W., & Plumb, R. A., (1989). Fracture evaluation using reflected Stoneley wave arrivals, Geophysics, 54, 1274-1289.

Kosteck ,S., Jonson, D. L.. Kenneth W. W., & Hormby, Br. (1988). The interaction of tube waves with borehole fractures. Part I: Numerical Models. Geophysics, 63, 800-808.

Latifa, Q., Tang X. M., & Kuijperl, A. (2001). Permeability determination from Stoneley waves in the Ara group carbonates, Oman. GeoArabia 6 (4): 649-666.

Paillet, F. L. & White, J. E. (1984). Acoustic modes of propagation in the borehole and their relationship to rock properties, Geophysics, 47, 1215-1228.

Rosenbaum, J. H. (1974). Synthetic micro seismograms: logging in porous formation: Geophyisics, 39, 14-39.

Tezuka, K., Endo, T., Miyairi, A., & Brie, H. (1995). Fast Stoneley modeling and its application for permeability fracture evaluation. Paper of First annual well logging
symposium of Japan. Chiba, September 21-22.

Tezuka, K., & Cheng, C. H. (1997). Modeling of low frequency Stoneley wave propagation in irregular borehole. Geophysics, 62, 1047-1058.

Williams, D. M., Zemanek, J., Angona, F. A, Denis, C. L., & Caldwell, R. L. (1984). Society of Professional Well Log Analysts Annual Logging Symposium 25th, New
Orleans. Transactions. p. T1-T16.

Wisse, C. J., Smeulders, D. M. J., & Dongen, M. E. H. (1998). Shock tube measurements on water-saturated porous cylinders, Paper presented at the 4th Biot Conference on Poromechanics, Louvain-la-Neuve, Belgium, September 14-16.
How to Cite
Escandón, C., & Montes, L. (2020). Detecting and characterizing fractures in sedimentary deposits with stoneley waves. CT&F - Ciencia, Tecnología Y Futuro, 4(2), 7-19. Retrieved from https://ctyf.journal.ecopetrol.com.co/index.php/ctyf/article/view/241

Downloads

Download data is not yet available.
Published
2020-04-15
Section
Scientific and Technological Research Articles

More on this topic