Karakterisasi Reservoir Berbasis Hydraulic Flow Unit (HFU) dan Estimasi Kapasitas Penyimpanan CO₂ pada Lapangan SAS, Cekungan Asri

Anggrayni, Sasmitha (2026) Karakterisasi Reservoir Berbasis Hydraulic Flow Unit (HFU) dan Estimasi Kapasitas Penyimpanan CO₂ pada Lapangan SAS, Cekungan Asri. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Lapangan minyak dan gas bumi yang telah mengalami penurunan produksi (depleted reservoir) memiliki potensi sebagai media penyimpanan geologi CO₂ karena telah terbukti mampu menyimpan fluida dalam jangka waktu yang lama. Penelitian ini bertujuan untuk mengevaluasi karakteristik reservoir, mengidentifikasi zona injeksi potensial, serta mengestimasi kapasitas penyimpanan CO₂ pada interval lower TAF di Lapangan SAS, Cekungan Asri. Analisis dilakukan menggunakan data log petrofisika, data core, dan analisis petrografi pada lima sumur, yaitu WD-1, WD-10, WD-A1, WD-B10, dan WD-E1. Karakterisasi reservoir dilakukan menggunakan metode Hydraulic Flow Unit (HFU) untuk menentukan distribusi rock type berdasarkan hubungan porositas dan permeabilitas. Estimasi kapasitas penyimpanan CO₂ dihitung menggunakan metode volumetrik United States Department of Energy (US-DOE). Hasil analisis menunjukkan bahwa interval lower TAF memiliki karakteristik reservoir yang sangat baik dengan rata-rata porositas sebesar 33.12%, permeabilitas sebesar 4132.19 mD, ketebalan net reservoir sebesar 59.41 m, serta kedalaman reservoir sekitar ±1400 m. Interval seal memiliki ketebalan gross sebesar 118.93 m dengan permeabilitas rendah sehingga mampu berfungsi sebagai batuan penutup yang efektif. Berdasarkan klasifikasi HFU, reservoir diklasifikasikan menjadi empat rock type (RT-1 hingga RT-4), di mana RT-4 menunjukkan kualitas reservoir terbaik dengan karakter clean sandstone, konektivitas pori sangat baik, dan permeabilitas tinggi. Zona 35-2 Sand diinterpretasikan sebagai zona injeksi paling potensial karena didominasi RT-4 dengan porositas sebesar 32.16%, permeabilitas sebesar 6367.47 mD, dan volume shale sebesar 4.95%. Estimasi kapasitas penyimpanan CO₂ pada zona 35-2 Sand menunjukkan kapasitas teoritis sebesar 94.11 juta ton dan kapasitas efektif sebesar 47.05–84.7 juta ton CO₂ berdasarkan variasi faktor efisiensi penyimpanan. Hasil penelitian menunjukkan bahwa reservoir lower TAF di Lapangan SAS memiliki tingkat kesesuaian yang sangat baik (highly suitable) sebagai media penyimpanan geologi CO₂ dan prospektif untuk pengembangan teknologi Carbon Capture and Storage (CCS).
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Depleted oil and gas reservoirs have significant potential for geological CO₂ storage because they have proven capable of trapping fluids over long geological periods. This study aims to evaluate reservoir characteristics, identify potential injection zones, and estimate CO₂ storage capacity within the lower TAF interval of the SAS Field, Asri Basin. The analysis was conducted using petrophysical log data, core data, and petrographic analysis from five wells, namely WD-1, WD-10, WD-A1, WD-B10, and WD-E1. Reservoir characterization was carried out using the Hydraulic Flow Unit (HFU) method to determine rock type distribution based on the porosity–permeability relationship. CO₂ storage capacity was estimated using the volumetric method proposed by the United States Department of Energy (US-DOE). The results indicate that the lower TAF interval possesses excellent reservoir characteristics, with an average porosity of 33.12%, permeability of 4132.19 mD, net reservoir thickness of 59.41 m, and reservoir depth of approximately ±1400 m. The seal interval has a gross thickness of 118.93 m with low permeability, indicating its effectiveness as a caprock. Based on HFU classification, the reservoir was divided into four rock types (RT-1 to RT-4), where RT-4 represents the best reservoir quality, characterized by clean sandstone, excellent pore connectivity, and high permeability. The 35-2 Sand zone was identified as the most prospective injection interval because it is dominated by RT-4, with porosity of 32.16%, permeability of 6367.47 mD, and shale volume of 4.95%. The estimated CO₂ storage capacity in the 35-2 Sand zone shows a theoretical capacity of 94.11 million tons and an effective storage capacity ranging from 47.05 to 84.7 million tons of CO₂ based on variations in storage efficiency factors. The results indicate that the lower TAF reservoir in the SAS Field has a highly suitable classification for geological CO₂ storage and is prospective for the development of Carbon Capture and Storage (CCS) technology.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Analisis Petrofisika, Hydraulic Flow Unit (HFU), Carbon Capture and Storage (CCS), Kapasitas Penyimpanan CO₂, Formasi Talang Akar, Cekungan Asri,Petrophysical Analysis, Hydraulic Flow Unit (HFU), Carbon Capture and Storage (CCS), CO₂ Storage Capacity, Talang Akar Formation, Asri Basin
Subjects:	Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Sasmitha Anggrayni
Date Deposited:	20 Jul 2026 01:42
Last Modified:	20 Jul 2026 01:42
URI:	http://repository.its.ac.id/id/eprint/134964

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