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STUDI KARAKTERISTIK OVERPRESSURE PADA LAPANGAN ANOA, CEKUNGAN NATUNA BARAT, KEPULAUAN RIAU

STUDY OF OVERPRESSURE CHARACTERISTIC IN ANOA FIELD, WEST NATUNA BASIN, RIAU ISLANDS

Undergraduate Theses from JBPTITBPP / 2018-07-13 15:03:48
Oleh : Nurul Isnania Putri (12013003), S1 - Geological Engineering-FITB
Dibuat : 2017-07-12, dengan 8 file

Keyword : Lapangan Anoa, Cekungan Natuna Barat, overpressure, mekanisme loading, diagenesa mineral lempung

Lapangan Anoa terletak di Cekungan Natuna Barat, di bagian barat Laut Natuna, yang dioperasikan oleh Premier Oil Natuna Sea B.V. Stratigrafi Lapangan Anoa terbagi atas enam formasi, yaitu Formasi Lama, Benua, Gabus Bawah, Keras, Gabus Atas, dan Muda. Penelitian ini dilakukan pada keenam formasi tersebut, yang berumur Eosen Akhir hingga Resen. Tujuan penelitian ini adalah untuk mengestimasi nilai tekanan pori, menentukan kedalaman puncak overpressure, menentukan mekanisme penyebab overpressure, dan menganalisis hubungan antara overpressure dengan kondisi geologi pada daerah penelitian. Penelitian dilakukan pada 2 sumur pemboran dengan menggunakan data log talikawat, data kecepatan interval seismik, data uji tekanan, data temperatur, laporan pengeboran, dan data geologi. Hasil analisis data menunjukkan bahwa kedua sumur yang diteliti mempunyai kondisi overpressure. Kedalaman overpressure berkisar antara 7.400 – 7.600 kaki di bawah permukaan air laut, dengan nilai tekanan pori sebesar 3.200 – 5.800 psi atau 8,2 – 10,4 ppg. Kedalaman puncak overpressure relatif mengikuti top Formasi Benua. Mekanisme utama penyebab terbentuknya overpressure pada Lapangan Anoa adalah mekanisme loading, yang disebabkan oleh pengendapan Formasi Muda. Mekanisme minor yang diduga juga berkontribusi terhadap pembentukan overpressure di daerah penelitian adalah diagenesa mineral lempung.

Deskripsi Alternatif :

The Anoa Field is located in the West Natuna Basin, in the western part of the Natuna Sea, operated by Premier Oil Natuna Sea B.V. The stratigraphy of the Anoa Field is divided into six formations, i.e. Lama, Benua, Lower Gabus, Keras, Upper Gabus, and Muda formations. The study is performed in these six formations, which are Late Eocene – Recent in age. The purpose of this study is to estimate pore pressure, determine the top of overpressure, determine the overpressure generating mechanism, and analyse the relationship between overpressure and geological condition in the study area. The study is performed in 2 drilling wells by using wireline log data, seismic interval velocity data, pressure test data, temperature data, well report, and geological data. The result of data analysis shows that both wells have overpressure condition. The top of overpressure varies from 7400 – 7600 ft TVDSS, with the magnitude of pore pressure is around 3200 – 5800 psi or 8.2 – 10.4 ppg. The top of overpressure relatively follows the top of the Benua Formation. The main overpressure generating mechanism in the Anoa Field is loading mechanism, which is caused by the deposition of the Muda Formation. The minor mechanism which is thought to be contributed to the overpressure generating mechanism in the study area is clay mineral diagenesis.


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  • Agus Mochamad Ramdhan, S.T., M.T., Ph.D., Editor: PKL-UIN-Raden Fatah

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