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All Journal Phi : Jurnal Pendidikan Fisika dan Terapan
Abdillah, Hanif Ridho
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Earth & Planetary Sciences Education Engineering Physics Other

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Geomechanical Integrity Assessment in Field X of the Telisa Formation Caprock for CO₂ Storage in the Central Sumatra Basin Abdillah, Hanif Ridho; Aurell Alyya Charissa; Handoyo Handoyo; Samosir, Sondang
Jurnal Phi: Kurnal Pendidikan Fisika & Terapan Vol 12 No 2 (2026)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v12i2.34352

Abstract

Evaluating caprock integrity is essential to ensure the long-term security of geological CO₂ storage. This study assesses the elastic and geomechanical characteristics of the Telisa Formation in the Central Sumatra Basin as a potential caprock for Carbon Capture and Storage (CCS). The analysis integrates well log data from four wells (C-1, H-1, P-1, and T-1), including gamma ray, sonic, density, and predicted shear-wave velocity logs. Elastic parameters such as Young’s Modulus (1–15 GPa) and Poisson’s Ratio (0.3–0.5) were calculated and used to derive the Brittleness Index (0–1.5), while Unconfined Compressive Strength (35–65 MPa) was estimated to evaluate rock strength. The results indicate that the Telisa Formation is predominantly shale-dominated, characterized by high gamma ray values and low porosity, consistent with typical caprock properties. Acoustic Impedance, Young’s Modulus, and UCS generally increase with depth, reflecting progressive compaction and enhanced rock stiffness. Crossplot analyses reveal positive correlations between Acoustic Impedance, Young’s Modulus, Brittleness Index, and UCS, and a negative relationship between Poisson’s Ratio and stiffness-related parameters. Although localized less brittle-to-brittle intervals are identified, particularly in Well P-1, the formation overall exhibits ductile to less brittle behavior. These findings suggest that the Telisa Formation demonstrates favorable mechanical integrity for CO₂ containment, if injection pressures are carefully managed and structural discontinuities are properly evaluated to minimize leakage risk.
Screening Potential CO₂ Storage Reservoirs Basin Using Petrophysical Evaluation: Case Study in Field X, Central Sumatra Basin Charissa, Aurell Alyya; Abdillah, Hanif Ridho; Handoyo, Handoyo; Samosir, Sondang
Jurnal Phi: Kurnal Pendidikan Fisika & Terapan Vol 12 No 2 (2026)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v12i2.34353

Abstract

This study was conducted to evaluate the feasibility of the Menggala Formation in the Central Sumatra Basin as a potential Carbon Capture and Storage (CCS) reservoir candidate based on the analysis of key petrophysical parameters. Well log analysis was carried out by determining reservoir depth, effective thickness, effective porosity, and Net-to-Gross (NTG) as indicators of reservoir suitability. The results show that the reservoir depth ranges from 1662.48 to 1805.14 m, with an average of 1705.108 m, thereby meeting the requirement for CO₂ storage under supercritical conditions. The average effective porosity of 15.54%, effective thickness of 23.38 m, and NTG value of 0.595 indicate adequate reservoir quality at the initial screening stage. Although lateral variation exists among the wells, the Menggala Formation generally meets the criteria as a potential CO₂ injection site. However, further studies, including volumetric storage capacity estimation and caprock (seal) integrity evaluation, are required to ensure long-term reservoir feasibility.
Co-Authors Aurell Alyya Charissa Charissa, Aurell Alyya Handoyo Handoyo Handoyo Handoyo Samosir, Sondang