Putra, Jeremy Michael (2025) Karakterisasi Reservoir Resistivitas Rendah Berdasarkan Hasil Analisis Petrofisika Melalui Resistivity Correction Serta Identifikasi Rock Type Metode Hydraulic Flow Unit. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Lapangan “JM” merupakan salah satu lapangan appraisal yang berada di Cekungan Sumatra Selatan. Namun, dengan adanya kehadiran mineral konduktif, sepeti pyrite dan siderite, resistivitas reservoir dapat berkurang sebesar 50% terutama jika volumenya lebih dari 4%, sehingga zona interval hidrokarbon justru dikategorikan sebagai water-bearing zone. Penelitian ini bertujuan untuk mengoreksi resistivitas pada interval yang mengandung heavy mineral dan mengetahui ketebalan interval hidrokarbon sebenarnya, mengkarakterisasi interval reservoir dengan identifikasi rock type metode hydraulic flow unit (HFU), serta mengestimasi jumlah cadangan hidrokarbon pada interval reservoir Formasi Telisa. Hasil resistivity correction factor (Rcf) berbasis kandungan heavy mineral, menyatakan faktor pengali Rcf 1.63 pada zona 10SS dengan kandungan 14%, 1.23 pada zona 11A-SS dengan kandungan 6%, dan 1.75 pada zona 11B-SS dengan kandungan 16%, memungkinkan perhitungan water saturation yang lebih akurat sehingga memvalidasi ketebalan net pay sebenarnya sebesar 82.84m. Analisis rock type mengklasifikasikan tiga klaster, yaitu RT-3 sebagai rock type terbaik dengan porositas 0.199–0.221 v/v dan permeabilitas 17.8–21.6 mD, RT-2 sebagai rock type moderate dengan porositas 0.089–0.181 v/v dan permeabilitas 0.03–0.92 mD, serta RT-1 sebagai rock type terburuk dengan porositas 0.129 v/v dan permeabilitas 0.01 mD. Hasil prediksi permeabilitas HFU menghasilkan koefisien korelasi (R) sebesar 0.827 menyatakan Permeabilitas HFU lebih representatif terhadap data core daripada Permeabilitas Timur. Karakteristik interval reservoir formasi Telisa dinyatakan sebagai tight gas reservoir dengan hasil perhitungan initial gas in place terdistribusi di zona 10SS sebesar 46.39 BSCF, 11A-SS sebesar 66.39 BSCF, dan 11B-SS sebesar 41.01 BSCF, menghasilkan total cadangan sebesar 153.79 BSCF.
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The "JM" Field is one of the appraisal fields located in the South Sumatra Basin. However, the presence of conductive minerals such as pyrite and siderite reduces reservoir resistivity by up to 50%, especially when their volume exceeds 4%, causing hydrocarbon-bearing intervals to be misinterpreted as water-bearing zones. This study aims to correct resistivity in intervals containing heavy minerals to determine the true thickness of hydrocarbon intervals, characterize reservoir intervals through rock type identification using the hydraulic flow unit (HFU) method, and estimate hydrocarbon reserves in the Telisa Formation reservoir intervals. The resistivity correction factor (Rcf) based on heavy mineral content yielded multiplication factors of 1.63 for zone 10SS with 14% mineral content, 1.23 for zone 11A-SS with 6% mineral content, and 1.75 for zone 11B-SS with 16% mineral content, allowing a more accurate water saturation calculation thus validating the actual net pay thickness of 82.84m. Rock type analysis classified three clusters, which is RT-3 as the best rock type with porosity of 0.199–0.221 v/v and permeability of 17.8–21.6 mD, RT-2 as moderate with porosity of 0.089–0.181 v/v and permeability of 0.03–0.92 mD, and RT-1 as the poorest rock type with porosity of 0.129 v/v and permeability of 0.01 mD. The result of permeability prediction using HFU showed a correlation coefficient (R) of 0.827, indicating that permeability using HFU is more representative against core data than permeability using Timur. The reservoir interval of the Telisa formation is characterized as tight gas reservoir with results of the calculated initial gas in place distributed across zone 10SS amounting to 46.39 BSCF, 11A-SS amounting to 66.39 BSCF, and 11B-SS amounting to 41.01 BSCF, yielding a total reserve of 153.79 BSCF.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Cadangan Hidrokarbon, Hydraulic Flow Unit, Karakterisasi Reservoir, Net Pay, Resistivity Correction Factor, Hydrocarbon Reserves, Hydraulic Flow Unit, Reservoir Characterization, Net Pay, Resistivity Correction Factor |
| Subjects: | Q Science > QA Mathematics > QA278.55 Cluster analysis Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Jeremy Michael Putra |
| Date Deposited: | 30 Jul 2025 06:41 |
| Last Modified: | 30 Jul 2025 06:41 |
| URI: | http://repository.its.ac.id/id/eprint/123790 |
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