Fitri Rusmaladewi, 1115051016 (2016) KARAKTERISASI RESERVOAR KARBONAT FORMASI KUJUNG CEKUNGAN JAWA TIMUR UTARA MENGGUNAKAN METODE SEISMIK INVERSI IA PADA LAPANGAN “RUSMALA”. Fakultas Teknik, UNIVERSITAS LAMPUNG.
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Abstract
Formasi Kujung terbentuk akibat naiknya muka air laut dan penyusutan dari kondisi reef. Berdasarkan hasil interpretasi melalui penyelidikan geologi, dijumpai adanya terumbu karbonat yang terus tumbuh, maka diindikasikan terdapat reservoar hidrokarbon pada formasi ini. Metode seismik impedansi akustik dapat memberikan gambaran fisis batuan dalam karakterisasi reservoar hidrokarbon. Penelitian ini dilakukan pada Lapangan “RUSMALA”, Formasi Kujung, Cekungan Jawa Timur Utara menggunakan data seismik 3D PSTM dan sumur F-1, F-2, dan F-3 yang telah dilengkapi oleh beberapa data log, checkshot dan marker dengan tujuan untuk mengetahui nilai impedansi dan porositas berdasarkan hasil model inversi impedansi akustik menggunakan metode model based pada Lapangan tersebut. Uji sensitivitas dilakukan dengan melakukan crossplot terhadap P-Impedance dan porosity. Crossplot ini mampu memisahkan litologi karbonat dan batuserpih dengan baik pada zona target. Berdasarkan dari hasil penelitian, reservoar karbonat pada Lapangan “RUSMALA” merupakan low impedance dan high porosity, dengan high resistivity, low density, dan low gamma ray, yang menunjukan bahwa reservoar ini mengandung hidrokarbon. Berdasarkan analisis yang dilakukan terhadap peta struktur, peta impedansi akustik dan peta pesebaran porositas didapatkan bahwa zona target merupakan daerah yang masih bisa dikembangkan. Kata kunci : inversi, impedansi akustik, model based, porosity RESERVOIR CARBONATE CHARACTERIZATION KUJUNG FORMATION NORTH EAST JAVA BASIN USING SEISMIC INVERSION AI IN “RUSMALA” FIELD Kujung formation formed by the rising of sea levels and the depreciation of the reef condition. Based on the results of interpretation through geological investigation, it was founded that there is carbonate reef which keeps growing, so it is indicated that there is a hydrocarbons reservoir in this formation. Acoustic impedance seismic methods can provide a physical description of the rock in hydrocarbon reservoir characterization. This research was conducted at "RUSMALA" field, Kujung formation, North East Java basin using 3D PSTM seismic data and F-1, F-2 and F-3 well which have been supplemented by several log data, checkshot and marker in order to determine the impedance and porosity values based on the model of acoustic impedance inversion results with model based method of the field. Sensitivity test done by crossplot to the P-impedance and porosity. Crossplot can separate lithology of carbonate and shale in target zone. Based on the results of this research, carbonate reservoir in "RUSMALA" field is low impedance and high porosity, with high resistivity, low density, and low gamma ray, which showed that the reservoir contains hydrocarbons. Based on the analysis conducted to the structure map, the acoustic impedance maps and porosity spreading maps, it is found that the target zone is an area which can be developed more. Keywords: inversion, acoustic impedance, model based, porosity
| Item Type: | Other |
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| Subjects: | Teknologi (General) Teknologi > Teknologi (General) Teknologi > Teknologi (General) Teknologi > Teknik Pertambangan. metalurgi Teknologi > Teknik Pertambangan. metalurgi |
| Divisions: | Fakultas Teknik > Prodi Geofisika |
| Depositing User: | 1626168 . Digilib |
| Date Deposited: | 28 Jan 2016 02:59 |
| Last Modified: | 28 Jan 2016 02:59 |
| URI: | http://digilib.unila.ac.id/id/eprint/20671 |
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