Acoustic Properties of Carbonate: An Experimental and Modelling Study
- Murtada Elhaj (Memorial University of Newfoundland) | Osman Abdullatif (King Fahd University of Petroleum and Minerals) | Abdulazeez Abdulraheem (King Fahd University of Petroleum and Minerals) | Amjed Hassan (King Fahd University of Petroleum and Minerals) | Abdullah Sultan (King Fahd University of Petroleum and Minerals)
- Document ID
- Society of Petroleum Engineers
- SPE Middle East Oil and Gas Show and Conference, 18-21 March, Manama, Bahrain
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 5 Reservoir Desciption & Dynamics, 5.1 Reservoir Characterisation, 0.2.2 Geomechanics, 0.2 Wellbore Design
- porosity, Acoustics, petrophysics, geology, geomechanics
- 11 in the last 30 days
- 12 since 2007
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The science of Acoustics deals with the propagation of mechanical waves in the three phases of materials, solids, liquids, and gases. In exploration and reservoir engineering, acoustic wave velocities play an essential role in reservoir description. The primary challenge in the initial evaluation and characterization of reservoirs is related to the understanding of its geology, petrophysics, and geomechanics. Therefore, an accurate estimation of acoustic wave velocities and rock porosity is essential for better reservoir description and performance as well as a better forecast of seismic properties. In this reseach, the primary objective is to analyze the texture, mineralogy, porosity and permeability data of outcrop carbonate rock samples to study the impact of confining pressure on wave velocities. Furthermore, an empirical correlation is proposed for relating porosity with acoustic properties.
Ninety outcrops samples are collected from Dam Formation in Al-Lidam area in Eastern Province, Saudi Arabia to develop a correlation. The carbonate samples varies from mudstone to grainstone facies. The samples are collected, prepared, and tested for this experimental study based on API standards. Compressional and shear wave velocities of carbonate rocks are measured under dry and fully brine-saturated conditions for 5 to 25 MPa effective confining pressures at room temperature. Moreover, porosity and permeability are measured using three different techniques, viz., AP-608 Automated Porosimeter-Permeameter, Helium Porosimeter, and thin section technique. Finally, the results are compared with those from other studies related to the same area.
A state-of-the-art review is presented on seismic properties, relationship with porosity and acoustics in addition to the current trend and the future challenges in the area. The laboratory investigations for this study reveals that Al-Lidam area has different types of facies. The results also show that both compressional and shear wave velocities increase as the confining pressure on the dry samples increase. However, the compressional wave velocities increased and the shear wave velocities decreased with confining pressure under fully saturated conditions. A new correlation is presented for carbonate rocks to predict porosity from acoustic wave velocities.
This study will help in improving the exploration efforts as well as give a better explanation for reservoir characterization, facies recognition, geophysical interpretation, and engineering calculations. This attempt will open a new research area for engineers and scientists to study the effect of variation in different properties on wave velocities.
|File Size||1 MB||Number of Pages||15|
Abdelkarim,Abdallah A,Abdullatif,Osman M,. Babalola,Lamidi O. 2018. High-resolution lithofacies and porosity modeling of the mixed siliciclastic– carbonate deposits of the Burdigalian Dam Formation, Eastern Saudi Arabia. International Journal of Earth Sciences. Vol. (9), pp 1–18. Springer Berlin Heidelberg. https://doi.org/10.1007/s12517-017-3244-1
Anselmetti, F. S. E.,Gregor P. 1993. Controls on sonic velocity in carbonates. Pure and Applied Geophysics PAGEOPH. Vol. (141), pp. 287–323. https://doi.org/10.1007/BF00998333
Bernabe, U. M. Y., and B. Evans 2003. Permeability-porosity Relationships in Rocks Subjected to Various Evolution Processes. Pure and Applied Geophysics PAGEOPH. Vol. (160), pp. 937–960. https://doi.org/10.1007/PL00012574
De-Hua, H., and A. Nur 1986. The Effects of Porosity and Clay Content on Wave Velocities in Sandstones. 51(11), pp. 2093–2107. https://doi.org/10.1190/1.1442062
Gassmann, F. 1951. Elastic waves through a packing of spheres. Society of Exploration Geophysicists. Vol (16), pp. 673–685. https://doi.org/10.1190/1.1437718
Klaas Verwer, H. B., and Jeroen A. M. Kenter 2008. Case History Acoustic properties of carbonates: Effects of rock texture and implications for fluid substitution. Society of Exploration Geophysicists. Vol (73), pp. B51–B65. https://doi.org/10.1190/1.2831935
Murphy, W. F. 1982. Effects of partial water saturation on attenuation in sandstones. The Acoustical Society of America. Vol. (71), pp. 1458–1468. https://doi.org/10.1121/1.387843
Nur, A. M.,Walls, J. D.,Winkler, K.. 1980. Effects of Fluid Saturation on Waves in Porous Rock and Relations to Hydraulic Permeability. Society of Petroleum Engineers Journal. Vol (20), pp. 450–458. SPE-8235-PA. https://doi.org/10.2118/8235-PA
Thierry Bourbie, B. Z. 1985. Hydraulic and acoustic properties as a function of porosity in Fontainebleau sandstone. Journal of Geophysical Research. Vol (90), pp. 1,524. https://doi.org/10.1029/JB090iB13p11524
Wyllie, M. R. J.,Gregory, A. R., and Gardner 1965. Elastic wave velocities in heterogeneous and porous media. Society of Exploration Geophysicists. Vol. (21), pp. 41–70. https://doi.org/10.1190/1.1438217