Arabian Journal for Science and Engineering

, Volume 44, Issue 1, pp 409–416 | Cite as

Rock Physics Relations Derived from Petrophysical Logs for Indus Offshore Area, Pakistan

  • Anees Ahmad Bangash
  • Khalid Amin KhanEmail author
  • Gulraiz Akhter
Research Article - Earth Sciences


Conventional seismic interpretation provides subsurface geometric information, while quantitative seismic interpretation can provide lithologic and fluid information, including saturations, porosity, density, Poisson’s ratio and other elastic parameters. Rock physics is the main science behind quantitative interpretation and includes a number of transforms, in the form of empirical relations, for the computation of various rock properties. In addition, crossplot templates of these properties help in facies modeling and reservoir characterization. This paper presents rock physics transforms between compressional velocity, shear velocity, density, porosity, resistivity and gamma ray radiation for Cretaceous to Miocene strata in the Indus offshore area, Pakistan. These transforms are empirical relations established through regression analysis between various petrophysical parameters. Logs from twelve wells have been used in the analysis to give a good representation of rock properties in the area. Most of the relations have a linear correlation coefficient above 0.74 and therefore can be used reliably in quantitative interpretation of seismic data.


Petrophysical logs Regression analysis Correlation analysis Rock physics Quantitative interpretation 


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  1. 1.
    Castagna, J.P.; Batzle, M.L.; Eastwood, R.L.: Relationships between compressional-wave and shear-wave velocities in clastic silicate rocks. Geophysics 50, 571–581 (1985)CrossRefGoogle Scholar
  2. 2.
    Castagna, J.P.; Batzle, M.L.; Kan, T.K.: Rock physics—The link between rock properties and AVO response, in Offset dependent reflectivity—theory and practice of AVO analysis. In: Castagna, J.P., Backus, M. (eds.) Investigations in Geophysics, No. 8, Society of Exploration Geophysics, pp. 135–171. Tulsa, Oklahoma (1993)Google Scholar
  3. 3.
    Lee, M.W.: Predicting S-wave velocities for unconsolidated sediments at low effective pressure. U.S. Geological Survey Scientific Investigations Report 2010–5138, p. 13 (2010)Google Scholar
  4. 4.
    Faust, L.Y.: A velocity function including lithologic variation. Geophysics 18, 271–288 (1953)CrossRefGoogle Scholar
  5. 5.
    Gardner, G.H.F.; Gardner, L.W.; Gregory, A.R.: Formation velocity and density—the diagnostic basics for stratigraphic traps. Geophysics 39, 770–780 (1974)CrossRefGoogle Scholar
  6. 6.
    Gombos, A.M.; Powell Jr., N.I.: The tectonic evolution of western India and its impact on hydrocarbon occurrences; an overview, in Selected topics relating to the Indian Ocean basins and margins. In: Davies, T.A., Coffin, M.F., Wise, S.W. (eds.) Sedimentary Geology, vol. 96, pp. 119–129 (1995)Google Scholar
  7. 7.
    Edwards, R.A.; Minshull, T.A.; White, R.S.: Extension across the Indian–Arabian plate boundary: the murray ridge. Geophys. J. Int. 142, 461–477 (2000)CrossRefGoogle Scholar
  8. 8.
    Gaedicke, C.; Schluter, H.U.; Roeser, H.; Prexl, A.; Schreckenberger, B.; Meyer, H.; Reichert, C.; Clift, P.; Amjad, S.: Origin of the northern indus fan and murray ridge. Northern Arabian Sea: interpretation from seismic and magnetic imaging. Tectonophysics 355, 127–143 (2002)CrossRefGoogle Scholar
  9. 9.
    Carmichael, S.M.; Akhter, S.; Bennett, J.K.; Fatimi, M.A.; Hosein, K.; Jones, R.W.; Longacre, M.B.; Osborne, M.J.; Tozer, R.S.J.: Geology and hydrocarbon potential of the offshore Indus Basin, Pakistan. Pet. Geosci. 15, 107–116 (2009)CrossRefGoogle Scholar
  10. 10.
    Keller, G.; Adatte, T.; Gardin, S.; Bartolini, A.; Bajpai, S.: Main Deccan volcanism phase ends near the K-T boundary: evidence from the Krishna–Godavari Basin, India. Earth Planet. Sci. Lett. 268, 293–311 (2008)CrossRefGoogle Scholar
  11. 11.
    Lippert, P.C.; Dupont-Nivet, G.; van Hinsbergen, D.J.J.; Zhao, X.; Coe, R.S.; Kapp, P.: The Paleogene latitude of Asia and the Proto-Tibetan plateau. In: Leech, M.L., et al. (eds.) Proceedings for the 25th Himalaya–Karakoram–Tibet Workshop. U.S. Geological Survey, Open-File Report 2010-1099 (2010)Google Scholar
  12. 12.
    Najman, Y.; Appel, E.; Boudagher-Fadel, M.; Bown, P.; Carter, A.; Garzanti, E.; Godin, L.; Han, J.; Liebke, U.; Oliver, G.; Parrish, R.; Vezzoli, G.: The age of India-Asia Collision: biostratigraphic, sediment logical and pale magnetic constraints. In: Leech, M.L., et al. (eds.) Proceedings for the 25th Himalaya–Karakoram–Tibet Workshop. U.S. Geological Survey, Open-File Report 2010-1099 (2010)Google Scholar
  13. 13.
    Dasgupta, S.; Mukhopadhyay, B.; Mukhopadhyay, M.; Nandy, D.R.: Role of transverse tectonics in the Himalayan collision: further evidences from two contemporary earthquakes. J. Geol. Soc. India 81, 241–247 (2013)CrossRefGoogle Scholar
  14. 14.
    Khan, K.A.; Akhtar, G.; Ahmed, Z.; Khan, M.A.; Naveed, A.: Wavelets—a computer based training tool for seismic signal processing. Pak. J. Hydrocarb. Res. 16, 37–43 (2006)Google Scholar
  15. 15.
    Khan, K.A.; Akhtar, G.: Computer-based experiments for learning seismic signal processing concepts. Comput. Appl. Eng. Educ. 23, 959–966 (2015)CrossRefGoogle Scholar
  16. 16.
    Mavko, G.; Mukerji, T.; Dvorkin, J.: The Rock Physics Handbook—Tools for Seismic Analysis of Porous Media, 2nd edn. Cambridge University Press, Cambridge (2009)CrossRefGoogle Scholar
  17. 17.
    Young, H.D.: Statistical Treatment of Experimental Data. McGraw-Hill, New York (1962). 172 pGoogle Scholar
  18. 18.
    McCloskey, D.N.; Ziliak, S.T.: The standard error of regressions. J. Econ. Lit. 34, 97–114 (1996)Google Scholar

Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • Anees Ahmad Bangash
    • 1
  • Khalid Amin Khan
    • 2
    Email author
  • Gulraiz Akhter
    • 1
  1. 1.Department of Earth SciencesQuaid-i-Azam UniversityIslamabadPakistan
  2. 2.K-tron Research Inc.RawalpindiPakistan

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