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Potential hydrocarbon zone identification: a case study

  • Mehedi HasanEmail author
  • Sigma Akter
  • Kamrul Islam
  • Hossain Al Tanjil
Original Paper
  • 52 Downloads

Abstract

Formation depiction is the progression that describes both physical and chemical properties of rocks and fluids through the exploitation of available log or core data. Geologic formations are generally heterogeneous in nature. Different types of well logs like caliper, SP, resistivity, gamma, sonic, neutron, and density logs are used to characterize formations. Formation temperature (Tf), porosity (Φ), permeability (k), formation water resistivity (Rwf), formation water saturation (Sw), etc. are the main characteristics of a reservoir. In this study, a gas field located in Brahmanbaria district, Bangladesh, with latitude 24° 00′ 58.6″ N and longitude 91° 07′ 14.4″ E is examined. The geothermal temperature gradient was 0.00735 °C/m with a temperature of 43.33 °C at depth of 3535 m. Four sand zones (identified as B, D, F, and H), four shale zones (identified as A, C, E, and G), and four sand mixed with shale zones (specified as I, J, K, and L) were mapped between depth 2800 and 3557 m. The average porosities (combining sonic, neutron, and density porosities) of zones B, D, F, and H were 25.5%, 26.2%, 23.95%, and 20.65%, respectively, with permeabilities of 84.26 mD, 49.64 mD, 35.01 mD, and 296.38 mD. Considering all the parameters (porosity, permeability, resistivity, and formation water saturation), it is shown that zone H (3036–3186 m) is a more effective gas production zone.

Keywords

Sonic log Neutron log Density log Formation porosity Potential zone Titas gas field 

Notes

Acknowledgements

The authors are very much grateful to the Chairman of Petrobangla, Bangladesh, for his kind permission to use the necessary data for this research.

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Mehedi Hasan
    • 1
    • 2
    Email author
  • Sigma Akter
    • 1
  • Kamrul Islam
    • 1
  • Hossain Al Tanjil
    • 1
  1. 1.Department of Petroleum and Mining EngineeringJashore University of Science and TechnologyJashoreBangladesh
  2. 2.Clean Energy and Carbon Dioxide Capture Lab, Department of Petroleum and Mining EngineeringJashore University of Science and TechnologyJashoreBangladesh

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