Pendekatan Geomekanika 3d Untuk Memprediksi Pore Pressure Dan Penilaian Integritas Lapisan Caprock Untuk Penyimpanan Co₂ Pada Lapangan Smeaheia

Algusfa, Mochammad Thoriq (2026) Pendekatan Geomekanika 3d Untuk Memprediksi Pore Pressure Dan Penilaian Integritas Lapisan Caprock Untuk Penyimpanan Co₂ Pada Lapangan Smeaheia. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini mengevaluasi integritas caprock dan menentukan batas tekanan injeksi aman untuk penyimpanan CO₂ di Lapangan Smeaheia, Laut Utara, menggunakan pendekatan geomekanika 3D pada dua sumur (32/2-1 dan 32/4-1) serta data seismik post-stack 3D. Prediksi tekanan pori 1D dengan metode Eaton menunjukkan gradien hidrostatik rata-rata 8,95 ppg, dengan anomali overpressure pada kedalaman 1060-1160 m dan underpressure hingga 5 ppg pada Formasi Lista (700-820 m), serta faktor regangan tektonik terkalibrasi sebesar 1,0 dan 1,2 pada masing-masing sumur. Model 3D hasil inversi impedansi akustik memetakan gradien overburden 12,00-15,50 ppg, tekanan pori 8,50-10,50 ppg, Shmin 13,00-15,25 ppg, dan SHmax 14,00-16,25 ppg, dengan Formasi Krossfjord mencatat nilai tertinggi di seluruh lapangan. Evaluasi Mohr-Coulomb pada lima Formasi menunjukkan bahwa tekanan injeksi sebesar 10,45-14,34 MPa masih berada di bawah nilai Maximum Allowable Injection Pressure (MAIP) sebesar 12,13-15,21 MPa. Formasi Draupne, Sognefjord, dan Heather berstatus aman dengan Safety Factor vertikal 1,44-1,64 dan Safety Factor sesar 1,80-2,87, namun Formasi Fensfjord berada tepat pada ambang kritis (SF vertikal = 1,00) dan Formasi Krossfjord menunjukkan indikasi kegagalan geser dengan SF vertikal 0,95 dan SF sesar 0,96. Hasil ini menegaskan bahwa Formasi Krossfjord menjadi faktor pembatas utama dalam penentuan batas operasi aman penyimpanan CO₂ jangka panjang di Lapangan Smeaheia.
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This study evaluates the integrity of the caprock and determines the safe injection pressure limits for CO₂ storage in the Smeaheia Field, North Sea, using a 3D geomechanical approach on two wells (32/2-1 and 32/4-1) as well as 3D post-stack seismic data. 1D pore pressure predictions using the Eaton method indicate an average hydrostatic gradient of 8.95 ppg, with overpressure anomalies at depths of 1060–1160 m and underpressure of up to 5 ppg in the Lista Formation (700–820 m), as well as calibrated tectonic strain factors of 1.0 and 1.2 for each well, respectively. The 3D model resulting from acoustic impedance inversion maps overburden gradients of 12.00–15.50 ppg, pore pressures of 8.50–10.50 ppg, Shmin of 13.00–15.25 ppg, and SHmax of 14.00–16.25 ppg, with the Krossfjord Formation recording the highest values across the entire field. Mohr-Coulomb evaluations of the five formations indicate that injection pressures of 10.45–14.34 MPa remain below the Maximum Allowable Injection Pressure (MAIP) range of 12.13–15.21 MPa. The Draupne, Sognefjord, and Heather formations are considered safe, with vertical safety factors of 1.44–1.64 and fault safety factors of 1.80–2.87, however, the Fensfjord Formation is exactly at the critical threshold (vertical SF = 1.00), and the Krossfjord Formation shows indications of shear failure with a vertical SF of 0.95 and a fault SF of 0.96. These results confirm that the Krossfjord Formation is the primary limiting factor in determining the safe operating limits for long-term CO₂ storage at the Smeaheia Field.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CCS, Tekanan Pori, Geomekanika, Caprock Integrity, Mechanical Earth Model, Smeaheia. CCS, Pore Pressure, Geomechanics, Caprock Integrity, Mechanical Earth Model, Smeaheia
Subjects:	Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE539.2 Seismic traveltime inversion Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport. Erosion.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Mochammad Thoriq Algusfa
Date Deposited:	20 Jul 2026 06:43
Last Modified:	20 Jul 2026 06:43
URI:	http://repository.its.ac.id/id/eprint/135521

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