| NIM | H1C016005 |
|---|
| Namamhs | LARASATI PINANJAR PUTRI |
|---|
| Judul Artikel | PEMODELAN STRUKTUR GEOLOGI BERDASARKAN DATA SEISMIK 3D DAN WELL: STUDI KASUS GJØA FIELD, NORTH SEA |
|---|
| Abstrak (Bhs. Indonesia) | Lapangan Gjøa terletak di Laut Utara Norwegia, dengan luas wilayah penelitian 306,25 km2. Lapangan ini berada pada area Horda Platfrom yang menunjukkan sejarah struktural kompleks akibat multi-phase rifting yang terjadi selama zaman Permian – Triasik Akhir (fase rifting 1) dan zaman Jurasik (fase rifting 2). Penelitian ini bertujuan untuk mengetahui kondisi geologi daerah penelitian, meliputi stratigrafi, potensi hidrokarbon, model struktur geologi serta evolusi model pengendapan sedimen dan struktur geologi pada daerah penelitian. Objek penelitian terletak pada interval formasi Statfjord dengan fokus penelitian berada di sumur 35/9-2. Data yang digunakan terdiri dari data seismik 3D dan data sumur. Metode yang digunakan dalam penelitian ini yakni analisis evaluasi formasi, analisis seismik, pemodelan struktur geologi, analisis ketebalan dan rekontruksi palinspatik. Stratigrafi daerah penelitian termasuk ke dalam Formasi Statfjord, terdiri dari litologi Batupasir dan Serpih. Struktur geologi bawah permukaan ditentukan berdasarkan analisis dari data seismik xline berarah Barat – Timur. Interpretasi data seismik dan log menunjukkan daerah penelitian memiliki struktur sesar-sesar normal yang berarah Utara – Selatan dan Timur Laut – Barat Daya sebagai produk dari multi-phase rifting pada zaman Triasik hingga Jurasik. Berdasarkan hasil analisis palinspatik didapatkan nilai strain pada zaman Triasik Akhir (Statfjord Group) yakni 5,59%, Jurasik Awal (Dunlin Group) 3,92%, Jurasik Tengah (Brent Group) 3,72%, Jurasik Akhir (Viking Group) 2,75%, Kapur Awal (Cromer Knoll Group) 0,13%, Kapur Akhir (Shetland Group) 0,10%, Tersier (Hordaland Group) 0,09% serta Tersier Akhir – Kuarter (Nordland Group) 0,06%. Berdasarkan hasil analisis strain tersebut diinterpretasikan pada zaman Triasik Akhir merupakan aktifitas rifting dengan fasa pemanjangan yang paling signifikan. Kemudian nilai strain yang rendah diinterpretasikan sebagai efek dari proses thermal subsidence. |
|---|
| Abtrak (Bhs. Inggris) | Gjøa field is located in Norwegian North Sea, with research area of 306.25 km2. This field is located in Horda Platfrom area which shows a complex structural history due to multi-phase rifting that occurred during Permian – Late Triassic period (rifting phase 1) and Jurassic period (rifting phase 2). This study aims to determine the geological conditions of the research area, including stratigraphy, hydrocarbon potential, geological structure models and evolution of sedimentary depositional models and geological structures in research area. The object of this research is located at interval of Statfjord formation with the focus of research being at the 35/9-2 well. The data used consists of 3D seismic data and well data. The methods used in this research are formation evaluation analysis, seismic analysis, geological structure modeling, thickness analysis and palinspathic reconstruction. The stratigraphy of research area belongs to Statfjord Formation, consisting of Sandstone and Shale lithology. The subsurface geological structure was determined based on the analysis of xline seismic data in the West – East direction. Interpretation of seismic data and logs shows that the study area has normal fault structures with a North – South and North East – Southwest trending as a product of multi-phase rifting in the Triassic to Jurassic epochs. Based on the results of the palinspathic analysis, the strain values in Late Triassic (Statfjord Group) were 5.59%, Early Jurassic (Dunlin Group) 3.92%, Middle Jurassic (Brent Group) 3.72%, Late Jurassic (Viking Group) 2 .75%, Early Cretaceous (Cromer Knoll Group) 0.13%, Late Cretaceous (Shetland Group) 0.10%, Tertiary (Hordaland Group) 0.09% and Late Tertiary – Quarter (Nordland Group) 0.06%. Based on the results of the strain analysis, it can be interpreted that the Late Triassic period was the rifting activity with the most significant elongation phase. Then the low strain value is interpreted as the effect of the thermal subsidence process. |
|---|
| Kata kunci | Lapangan Gjøa, Seismik 3D, Pemodelan Struktur Geologi, Analisis Palinspatik. |
|---|
| Pembimbing 1 | Dr. Ir. Asmoro Widagdo, S.T., M.T |
|---|
| Pembimbing 2 | Maulana Rizki Aditama, S.Si., M.Sc |
|---|
| Pembimbing 3 | |
|---|
| Tahun | 2021 |
|---|
| Jumlah Halaman | 13 |
|---|
| Tgl. Entri | 2021-07-19 13:12:13.208731 |
|---|