Reny, YuliNur (2011) Identifikasi penyebaran gas pada reservoir karbonat formasi Baturaja menggunakan metode AVO (Amplitude Variation with Offset) dari data seismik 3D lapangan ren cekungan Sumatera Selatan. Sarjana thesis, Universitas Brawijaya.
Abstract
Penelitian ini bertujuan untuk mengidentifikasi penyebaran gas pada sumur R-1, R-10, R-4, R-5 dan R-8 apakah terdapat zona anomali AVO atau tidak. Kelima sumur tersebut terletak antara Inline 2800-2974 dan X-line 10453-10833 pada lapangan Ren cekungan Sumatera Selatan. Target penelitian difokuskan pada formasi Baturaja yang terdiri dari sub formasi reef, baturaja, platform, konglomerat dan basement. Lapangan Ren tersusun atas batuan karbonat yang kompak dan diendapkan pada masa Miocene awal melalui pengendapan system megacycle transgression. Penelitian ini menggunakan metode AVO (Amplitude Variation with Offset) yang didasarkan atas refleksi dan transmisi gelombang P, koefisien refleksi akan berubah seiring dengan bertambahnya offset. Offset akan berhubungan langsung dengan sudut datang gelombang yang akan mereprentasikan anomali AVO. Metode AVO yang digunakan antara lain pemodelan AVO ke depan (forward modeling), analisa AVO dari data seismik 3D serta horizon slice dari hasil crossplot antara intercept dan gradient. Berdasarkan hasil pemodelan AVO dan analisa AVO dari data seismik 3D diketahui konsistensi sebaran gas antara time window 952 ms-988 ms pada sumur R-1 formasi Baturaja. Sebaran gas diketahui muncul antara time window 1030 ms-1054 ms pada sumur R-10 juga. Berdasarkan penelitian, didapatkan respon anomali AVO kelas 3. Sedangkan untuk ketiga sumur R-4, R-5 dan R-8 tidak terdapat sebaran gas. Secara kualitatif, hasil horizon slice dengan menggunakan attribut crossplot intercept dan gradient, memperlihatkan bahwa pola penyebaran anomali AVO mengelilingi sumur R-1 yang menyebar kearah tenggara dari sumur R-10 dan terletak di daerah reef yang built up.
English Abstract
This study is conducted to identify gas distribution at the R-1, R-10, R-4, R-5 and R-8 wells whether there are AVO anomalies or not. These five wells are located between 2800-2974 Inline and 10453-10833 X-line on the Ren field in South Sumatera basin. The research is focused on the Baturaja formation consisting of reef, baturaja, platform, conglomerate and basement sub formation. Ren field consists of tight carbonates rock and deposited during the early Miocene through the system megacycle transgression deposition. This research use AVO (Amplitude Variation with Offset) methods which is based on reflection and transmission of P-Wave. The reflection coefficient will change with increasing of offset. Offset, which is directly related with angle of incident wave, would represent the AVO anomaly. The AVO methods used are forward modeling AVO, AVO analysis of 3D seismic data and horizon slice from the crossplot between intercept and gradient. Based on the result of AVO modeling and AVO analysis of 3D seismic data, there is consistency of gas distribution in the time window 952 ms-988 ms Baturaja formation. For the gas distribution is resulted between time window 1030 ms-1054 ms. Based on the responses, the class 3 AVO anomaly is obtained in this analysis, whereas, for wells R-4, R-5 and R-8 there are no gas distribution. The identification results for distributing gas in Ren field are conducted by using AVO attributes. The result of horizon slice using crossplot intercept and gradient attributes showed that qualitatively distribution of AVO anomaly pattern around the R-1 wells spread towards southeast to the R-10 wells, located in a built up area of reef.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/MIPA/2010/349/051100553 |
| Subjects: | 500 Natural sciences and mathematics > 530 Physics |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika |
| Depositing User: | Unnamed user with email repository.ub@ub.ac.id |
| Date Deposited: | 10 Aug 2011 13:38 |
| Last Modified: | 22 Oct 2021 06:46 |
| URI: | http://repository.ub.ac.id/id/eprint/152485 |
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