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Rinaldo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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Journal : Journal of Geoscience, Engineering, Environment, and Technology

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The Influence of Pore Porosity on Overpressure Formation: A Case Study of Field X, Kutai Basin Dhiau Rahman Fikri; Abdul Haris; Rinaldo; Widi Atmoko
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.22308

Abstract

The Kutai Basin is a region with complex geological characteristics, which complicate formation pressure prediction and pose drilling risks such as overpressure. This study aims to analyze the relationship between porosity and overpressure using well log data, including sonic (DT), resistivity (ILD), neutron porosity (NPHI), and density (RHOB) logs. Overpressure is calculated based on the difference between actual pore pressure and normal hydrostatic pressure, supported by vertical stress estimation. The analysis results indicate that overpressure zones occur within specific intervals, particularly in the Pulau Balang Formation, which is dominated by impermeable shale lithology. These overpressure zones are characterized by high DT values, low ILD readings, and sustained high porosity despite increasing depth. This suggests that the overpressure is caused by undercompaction (Disequilibrium compaction), where rapid sedimentation rates hinder the expulsion of pore fluids. A Dutta crossplot confirms the dominance of smectite minerals that have not yet transformed into illite, reinforcing the indication that the rocks have not undergone significant chemical compaction. The correlation between preserved porosity and overpressure zones provides critical information for mitigating drilling risks and optimizing reservoir development.
Co-Authors A. Haris Abdul Haris Abdur Rohman Abdurrohman Ahmad Soderi Aminuyati Anggi, Michael Anjelis Ratu Wulan Anwar T Sitorus Arainy, Corizon Sinar Corizon Sinar Arainy Daniel Happy Putra Devi puspitasari, Devi Dewi, Ratna Kusuma Dhiau Rahman Fikri Diantoro, Karno Fitria Karno Diantoro Meutia, Kardinah Indrianna Muhammad Ikrar Yamin Nuraini Purwandari Rohman , Abdur Samroh Saromah Sinar, Corizon Sitorus, Anwar T Sitorus, Anwar T. Soderi, Ahmad Sucipto, Purwo Agus Sumaryanto, Agus Widi Atmoko Wulan, Anjelis Ratu Yamin, Muhammad Ikrar