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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
  • 34 Downloads

Abstract

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.

Keywords

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

Notes

Acknowledgments

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.

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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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