Petrophysical analysis of well logs for reservoir evaluation: a case study of “Kadanwari” gas field, middle Indus basin, Pakistan

  • Muhammad Ali
  • Muhammad Jahangir KhanEmail author
  • Mubarik Ali
  • Shaista Iftikhar
Original Paper


Our study focuses on the interpretation of wire-line logs to evaluate the hydrocarbons potential of sandstone reservoir in the Kadanwari gas field, Sindh, Pakistan. We have considered wire-line logs of four drilled wells (K-01, K-03, K-10, and K-11) in the research area and interpreted 13 reservoir zones. Analytical reservoir analysis includes the shale content (Vsh), effective porosity (Øeff), hydrocarbon and water saturation (Shc and Sw), and net pay thickness variations. Hydrocarbon-bearing zone characterized by high resistivity values, porosity high, permeability high, saturation of water low, and less Vsh suggest clean sand. The petrophysical analysis revealed the hydrocarbon potential of lower Goru sandstone packages at different levels (2886–3797 m). The petrophysical parameters of sub-reservoirs were carefully analyzed which are ranked as good quality sand reservoirs with average effective porosities ranging from 0.11–0.44%, average water saturation ranging from 0.18–0.45%, hydrocarbon saturation averaging between 0.59–0.86%, and permeability ranging from 10.539 to 477.76 m Darcy. Water saturation for heterogeneous shaly sand reservoirs was successfully tested by Indonesian model which suggests that Sw in each well is fewer than 60% therefore over all the region bearing good quality of hydrocarbon potential of the targeted formation and selected zones. The vertical and horizontal variations of reservoir parameters are studied through constructing the litho-saturation cross-plots and isoparametric maps of the petrophysical parameters, respectively. The isoparametric maps help to visualize the geographical distribution of reservoir configuration in the subsurface. The petrophysical estimates of this study appraise the national conventional fuel treasure of lower Goru formation in Kadanwari gas fields and suggest new prospects to drill more wells on the central portion of the southwestern part of the study area. The neighboring area to the south of Kadanwari-01 is economically viable for hydrocarbon exploration. The northeastern side of the study area is avoided due to the high concentration of water and excessive shale content.


Well log evaluation Kadanwari-01 Kadanwari-03 Kadanwari-10 Kadanwari-11 Hydrocarbons 



The authors acknowledge the professional help of geologist/petrophysicist of the Pakistan Petroleum Limited, Karachi. The authors are thankful to the potential reviewers for their critical insight and positive criticism. The authors utilized the resources of Digital Geophysical Data Lab (founded by Professor Mubarik Ali as PPL Chair), at Bahria Uni., Karachi Campus.


  1. Ahmad N, Chaudhry S (2002) Kadanwari gas field, Pakistan: a disappointment turns into an attractive development opportunity. Pet Geosci 8(4):307–316CrossRefGoogle Scholar
  2. Ahmad N, Fink P, Sturrock S, Mahmood T, Ibrahim M (2004) Sequence stratigraphy as predictive tool in lower Goru fairway, lower and middle Indus platform, Pakistan: In: PAPG, Annual Technical Conference, pp 85–104Google Scholar
  3. Ahmad N, Spadini G, Palekar A, Subhani MA (2007) Porosity prediction using 3D seismic inversion Kadanwari gas field, Pakistan. Pak J Hydrocarb Res 17:95–102Google Scholar
  4. Asquith G, Krygowski D (1982) Basic well log analysis. 2nd ednGoogle Scholar
  5. Asquith GB, Krygowski D, Gibson CR (2004) Basic well log analysis. American Association of Petroleum Geologists, TulsaGoogle Scholar
  6. Azeem T, Chun WY, Lisa M, Khalid P, Qing LX, Ehsan MI, Munawar MJ, Wei X (2017) An integrated petrophysical and rock physics analysis to improve reservoir characterization of cretaceous sand intervals in Middle Indus Basin, Pakistan. J Geophys Eng 14:212–225CrossRefGoogle Scholar
  7. Baig MO, Harris N, Ahmed H, Baig M (2016) Controls on reservoir diagenesis in the lower Goru sandstone formation, Lower Indus basin, Pakistan. J Pet Geol 39(1):29–47CrossRefGoogle Scholar
  8. Cudjoe S, Vinassa M, Gomes JH, Barati R (2016). A comprehensive approach to sweet-spot mapping for hydraulic fracturing and CO2 huff-n-puff injection in Chattanooga shale formation. In Press, Journal of Natural Gas Science & Engineering, March 2016Google Scholar
  9. Dolan P (1990) Pakistan: a history of petroleum exploration and future potential. In: Brooks J (ed) Classic petroleum provinces. Geological Society, London, Special Publications, 50, pp 503–524Google Scholar
  10. Kadri IB (1995) Petroleum geology of Pakistan. Pakistan Petroleum Limited, KarachiGoogle Scholar
  11. Kazmi AH, Jan MQ (1997) Geology and tectonics of Pakistan. Graphic Publ., KarachiGoogle Scholar
  12. Khan MJ, Khan HA (2018) Petrophysical logs contribute in appraising productive sands of lower Goru formation, Kadanwari concession, Pakistan. J Pet Explor Prod Technol 8:1089–1098. CrossRefGoogle Scholar
  13. Khan MJ, Ali M, Khan M (2017) Gamma ray-based facies modelling of lower Goru formation: a case study in Hakeem Daho Well Lower Indus Basin Pakistan. Bahria Univ Res J Earth Sci 2:40–45Google Scholar
  14. Mahbaz S (2011) Optimization of reservoir cut-off parameters: a case study in SW Iran. Pet Geosci 17:335–363CrossRefGoogle Scholar
  15. Milan, G. and Rodgers, M. 1993. Stratigraphic evolution and play possibilities in the Middle Indus area, Pakistan. Paper presented at the SPE Pakistan Seminar, Islamabad, January 19Google Scholar
  16. Nazeer A, Abbasi SA, Solangi SH (2016) Sedimentary facies interpretation of gamma ray (GR) log as basic well logs in Central and Lower Indus Basin of Pakistan. Geodesy and Geodynamics 7:432e443–432e443. CrossRefGoogle Scholar
  17. Olurotimi J (2013) Petrophysical properties evaluation for reservoir characterisation of SEYI oil field (Niger-Delta). Int J Innov Appl Stud 3(3):765–773Google Scholar
  18. Poupon A, Leveaux J (1971) Evaluation of water saturation in shaly formations. In: Proceedings SPWLA 12th Annual Logging Symposium, Society of Petrophysicists and Well-Log AnalystsGoogle Scholar
  19. Rider MH (1990) Gamma-ray log shape used as a facies Indicator critical analysis of an over simplified methodology. In: Hurst A, Lovell MA, Morton AC (eds) Geological applications of wireline logs. Geological Society of London Special publication, London, p 406 ISBN: 090331780XGoogle Scholar
  20. Vinassa, M., Cudjoe, S. E., Gomes, J. H. B., & Ghahfarokhi, R. B. (2015). A comprehensive approach to sweet-spot mapping for hydraulic fracturing and CO2 huff-n-puff injection in Chattanooga shale formation. Society of Petroleum Engineers

Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Muhammad Ali
    • 1
  • Muhammad Jahangir Khan
    • 1
    Email author
  • Mubarik Ali
    • 1
  • Shaista Iftikhar
    • 1
  1. 1.Department of Earth & Environmental SciencesBahria University (Karachi Campus)KarachiPakistan

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