Integrasi Data Log Sumur Dan Seismik Untuk Inversi Impedansi Akustik Pada Formasi Minahaki, Cekungan Banggai-Sula, Sulawesi Tengah

Yunita, Oktaviani Dwi Rahma (2025) Integrasi Data Log Sumur Dan Seismik Untuk Inversi Impedansi Akustik Pada Formasi Minahaki, Cekungan Banggai-Sula, Sulawesi Tengah. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk mengkarakterisasi struktur dan reservoar pada interval karbonat Formasi Minahaki di Lapangan OKT, Cekungan Banggai–Sula, melalui integrasi data seismik 3D PSTM (Post-Stack Time Migration) dan data dua sumur (OKT-1 dan OKT-2). Studi dilakukan secara tidak langsung menggunakan data sekunder berupa well log, marker stratigrafi, dan checkshot. Proses penelitian meliputi interpretasi horizon, pembuatan peta struktur waktu dan kedalaman, konversi waktu ke kedalaman dengan regresi non-linear hasil kalibrasi checkshot, analisis ketebalan interval, serta karakterisasi reservoar menggunakan crossplot parameter petrofisika (porositas, gamma ray, dan impedansi akustik). Model awal impedansi bawah permukaan dikembangkan sebagai dasar inversi model-based untuk memperoleh visualisasi distribusi lateral dan vertikal properti batuan secara detail. Hasil penelitian menunjukkan bahwa integrasi data seismik dan log sumur pada sumur OKT-1 dan OKT-2 berhasil dilakukan dengan korelasi tinggi (0,93 dan 0,95), memungkinkan identifikasi horizon top Minahaki dan top Matindok secara presisi. Peta struktur waktu, kedalaman, dan ketebalan berhasil disusun, dengan zona antiklin di barat–utara teridentifikasi sebagai area prospektif, serta ketebalan maksimum interval >400 ft di timur–tenggara. Inversi impedansi akustik model-based menunjukkan nilai IA rendah ±25.000–35.000 g·ft/(cm³·s) pada interval target, dengan relative misfit –12,77 dB dan error energi 5,28%, mengindikasikan akurasi tinggi dan potensi zona berpori sebagai reservoar.
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This research aims to characterize the structure and reservoir properties within the carbonate interval of the Minahaki Formation at the OKT Field, Banggai–Sula Basin, through the integration of 3D PSTM (Post-Stack Time Migration) seismic data and data from two wells (OKT-1 and OKT-2). The study utilizes secondary data sources, including well logs, stratigraphic markers, and checkshot data, without direct field measurements. The methodological workflow comprises horizon interpretation, construction of time and depth structure maps, time-to-depth conversion using non-linear regression functions calibrated to checkshot data, interval thickness analysis, and reservoir characterization via crossplots of petrophysical parameters (porosity, gamma ray, and acoustic impedance). An initial subsurface impedance model was developed as the basis for model-based inversion, enabling detailed visualization of lateral and vertical variations in rock properties. The results of this study indicate that seismic and well log integration at wells OKT-1 and OKT-2 was successfully performed through a well-seismic tie, achieving high correlation values of 0.93 and 0.95, respectively. This enabled precise identification of the Top Minahaki and Top Matindok horizons. Time structure, depth structure, and isochore maps were generated, with a structural high (anticline) in the northwest identified as the most prospective area for hydrocarbon accumulation, and maximum interval thickness exceeding 400 ft in the southeast. Model-based acoustic impedance inversion revealed low IA values ±25,000–30,000 g·ft/(cm³·s) within the target interval, with a relative misfit of –12.77 dB and energy error of 5.28%, indicating high accuracy and the presence of porous zones with reservoir potential.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Formasi Minahaki, Inversi, Reservoir, Seismik, Sumur, Inversion, Minahaki Formation, Reservoir, Seismic, Well
Subjects:	Q Science > QE Geology > QE539.2 Seismic traveltime inversion Q Science > QE Geology > QE539.2.S4 Seismic models
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Oktaviani Dwi Rahma Yunita
Date Deposited:	24 Jul 2025 06:30
Last Modified:	24 Jul 2025 06:30
URI:	http://repository.its.ac.id/id/eprint/121212

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