Fernando, Muhammad Fiko (2025) Hubungan Fasies Seismik terhadap Persebaran Nilai Impedansi Akustik pada Reservoir Karbonat di Formasi Kujung, Lapangan KOH. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Formasi Kujung pada Lapangan KOH merupakan salah satu sistem reservoir karbonat yang ada di Cekungan Jawa Timur Utara. Reservoir karbonat sendiri dikenal memiliki tingkat heterogenitas yang tinggi akibat variasi litologi, porositas, dan pengaruh proses diagenesis, sehingga mempersulit proses karakterisasi menggunakan metode konvensional. Penelitian ini bertujuan untuk menganalisis hubungan antara fasies seismik berdasarkan konfigurasi internal dan amplitudo refleksi dengan sebaran nilai impedansi akustik hasil inversi seismik model-based pada Formasi Kujung, Lapangan KOH, di Cekungan Jawa Timur Utara. Data yang digunakan meliputi seismik 3D post-stack depth migration (PSDM), data empat sumur (KOH1, KOH2, KOH4, dan KOH5), serta data log seperti gamma ray, sonik, resistivitas, densitas, dan neutron. Inversi dilakukan menggunakan metode model-based untuk memperoleh peta distribusi impedansi akustik, sedangkan fasies seismik diinterpretasikan berdasarkan pola refleksi seperti parallel (platform), mounded, chaotic, inclined. dan parallel (basinal). Hasil analisis menunjukkan bahwa fasies mounded dan chaotic memiliki impedansi akustik paling rendah, fasies parallel (platform) memiliki nilai impedansi rendah, fasies inclined menunjukkan gradasi impedansi dari rendah ke tinggi, dan fasies parallel (basinal) memiliki nilai impedansi tertinggi.
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The Kujung Formation in Field KOH is one of the carbonate reservoir systems located in the North East Java Basin. Carbonate reservoirs are known for their high heterogeneity due to variations in lithology, porosity, and the effects of diagenetic processes, making characterization using conventional methods challenging. This study aims to analyze the relationship between seismic facies, interpreted from internal configuration and reflection amplitude, and the distribution of acoustic impedance derived from model-based seismic inversion in the Kujung Formation, Field KOH, within the North East Java Basin. The data utilized include 3D post-stack depth migration (PSDM) seismic data, four wells (KOH1, KOH2, KOH4, and KOH5), and well logs such as gamma ray, sonic, resistivity, density, and neutron. Acoustic impedance inversion was conducted using the model-based method to generate an acoustic impedance distribution map, while seismic facies were interpreted based on reflection patterns such as parallel (platform), mounded, chaotic, inclined, and parallel (basinal). The results show that mounded and chaotic facies are associated with relatively low acoustic impedance values, parallel (platform) facies exhibit intermediate impedance values, inclined facies show a gradation from low to high impedance, and parallel (basinal) display the highest acoustic impedance values.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Fasies Seismik, Inversi Model-Based, Reservoir Karbonat. Seismic Facies, Model-Based Inversion, Carbonate Reservoir. |
| Subjects: | Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE539.2 Seismic traveltime inversion |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Fiko Fernando |
| Date Deposited: | 30 Jul 2025 09:57 |
| Last Modified: | 30 Jul 2025 09:57 |
| URI: | http://repository.its.ac.id/id/eprint/122630 |
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