Fadhilah, Adinda Rana (2025) Analisis Tekanan Pori dan Mekanisme Overpressure di Lapangan “R” Cekungan Asri serta Evaluasi Kelayakan Formasi Talang Akar sebagai Lokasi Penyimpanan Karbon. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini bertujuan untuk menghitung log tekanan pori, menganalisis mekanisme overpressure, dan membuat model distribusi tekanan pori di Lapangan “R” Cekungan Asri sebagai masukan dalam perencanaan pengeboran. Berdasarkan ketiga tujuan tersebut, akan diketahui kelayakan reservoir Talang Akar sebagai lokasi penyimpanan karbon. Perhitungan tekanan pori dilakukan menggunakan metode Eaton pada zona shale berdasarkan data log sumur dengan validasi oleh data tes tekanan dan mudweight. Tekanan fraktur juga dihitung menggunakan metode Eaton. Data log sumur, output log tekanan pori, dan data geokimia (BHT, Tmax, Ro, dan XRD) diintegrasikan dalam analisis mekanisme overpressure. Model distribusi tekanan pori dibuat melalui inversi seismik post-stack model-based berdasarkan data seismik, log, checkshot, top marker, dan horizon. Hasil menunjukkan bahwa Formasi Baturaja hingga Formasi Talang Akar (Lower Zelda) memiliki tekanan pori normal. Overpressure mulai muncul pada Formasi Talang Akar (LL. Zelda) yang mendekati Banuwati Shale. Adapun overpressure masif terjadi pada Formasi Banuwati hingga Basement. Mekanisme overpressure dominan di Lapangan “R” adalah unloading tipe kematangan hidrokarbon dan diagenesis mineral lempung yang terjadi signifikan pada interval LL. Zelda hingga Banuwati Clastic. Sementara overpressure dengan mekanisme loading terjadi pada interval Lower Zelda hingga LL. Zelda dan interval mendekati Basement. Adapun tekanan pori tertinggi terpusat pada bagian central (rendahan). Area flank (kemiringan struktur) bagian barat memiliki tekanan pori lebih tinggi daripada bagian utara. Sementara area crestal (tinggian) memiliki tekanan pori terendah. Reservoir Talang Akar sebagai target penyimpanan karbon dinilai layak karena memiliki tekanan normal, dimana penilaian tersebut hanya terbatas pada aspek tekanan pori. Untuk menghindari drilling event, kegagalan injeksi, dan kebocoran karbon dioksida maka disarankan untuk menghindari area central dan maksimal zona dilakukannya penyimpanan karbon adalah Lower Zelda (tidak mencapai LL. Zelda).
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This study aims to calculate pore pressure logs, analyze overpressure mechanisms, and develop a pore pressure distribution model in the “R” Field, Asri Basin, as input for drilling planning. Based on these objectives, the feasibility of the Talang Akar reservoir as a potential carbon storage site can be evaluated. Pore pressure was calculated using the Eaton method in shale zones based on well log data, validated with pressure test and mud weight data. Fracture pressure was also estimated using the Eaton method. Well log data, pore pressure log outputs, and geochemical data (BHT, Tmax, Ro, and XRD) were integrated to analyze the overpressure mechanism. The pore pressure distribution model was developed through post-stack model-based seismic inversion using seismic data, well logs, checkshots, top markers, and interpreted horizons. The results show that the Baturaja Formation to the Talang Akar Formation (Lower Zelda) exhibits normal pore pressure. Overpressure begins to develop within the Talang Akar Formation (LL. Zelda), approaching the Banuwati Shale. Massive overpressure is observed from the Banuwati Formation down to the Basement. The dominant overpressure mechanism in the “R” Field is unloading, associated with hydrocarbon maturation and clay mineral diagenesis, significantly occurring within the LL. Zelda to Banuwati Clastic intervals. Meanwhile, loading-related overpressure occurs in the Lower Zelda to LL. Zelda intervals and near the Basement. The highest pore pressure is concentrated in the central (structural low) area, while the western flank (structural slope) has higher pressure than the northern flank. The crestal (structural high) area exhibits the lowest pore pressure. The Talang Akar reservoir is considered suitable for carbon storage due to its normal pore pressure condition, although this assessment is limited to the pore pressure aspect. To avoid drilling incidents, injection failure, and potential CO₂ leakage, it is recommended to avoid the central area and limit the carbon storage zone to the Lower Zelda interval (doesn’t reach LL. Zelda).
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Eaton, Inversi Model-Based, Mekanisme Overpressure, Penyimpanan Karbon, Tekanan Pori, Carbon Storage, Model-Based Inversion, Overpressure Mechanism, Pore Pressure |
| Subjects: | Q Science Q Science > QE Geology Q Science > QE Geology > QE539.2.S4 Seismic models |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Adinda Rana Fadhilah |
| Date Deposited: | 30 Jul 2025 04:12 |
| Last Modified: | 30 Jul 2025 04:12 |
| URI: | http://repository.its.ac.id/id/eprint/123143 |
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