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STUDI KARAKTERISTIK OVERPRESSURE LAPANGAN THD, CEKUNGAN KUTAI BAWAH, KALIMANTAN TIMUR

STUDY OF OVERPRESSURE CHARACTERISTIC IN THD FIELD, LOWER KUTAI BASIN, EAST KALIMANTAN

Undergraduate Theses from JBPTITBPP / 2018-05-17 13:35:21
Oleh : ANTHEA PREVIANTI AMALIA (NIM : 12012082), S1 - Geological Engineering-FITB
Dibuat : 2016, dengan 8 file

Keyword : Cekungan Kutai Bagian Bawah, Delta Mahakam, tekanan pori, overpressure, nonloading

Lapangan THD terletak di Cekungan Kutai Bawah, di bagian batas timur Delta Mahakam Modern. Lapangan ini merupakan lapangan yang aktif menghasilkan hidrokarbon yaitu gas. Penelitian ini dilakukan pada Lapangan THD. Stratigrafi tidak resmi Lapangan THD terbagi menjadi dua zona yaitu Zona Utama dan Zona Dangkal. Penelitian ini dilakukan di Zona Utama. Zona ini terdiri dari Kelompok Kampung Baru dan Kelompok Balikpapan yang berumur Miosen Tengah - Miosen Akhir.

Tujuan penelitian ini adalah untuk mengestimasi besar tekanan pori dan menentukan kedalaman puncak overpressure, menganalisis mekanisme penyebab overpressure, serta menganalisis hubungan antara distribusi overpressure dengan kondisi geologi pada lokasi penelitian. Analisis dilakukan pada 21 sumur di Lapangan THD. Data yang digunakan dalam penelitian ini berupa log tali kawat (log sinar gamma, densitas, sonik, neutron, resistivitas), data tekanan dan temperatur, laporan pengeboran, serta data reflektansi vitrinit.

Hasil yang didapat dari penelitian ini adalah Lapangan THD memiliki puncak overpressure pada kedalaman 3500 – 4000 meter di bawah permukaan laut, dengan besar tekanan pori pada puncak overpressure sebesar 35 – 40 MPa. Mekanisme utama penyebab overpressure pada Lapangan THD adalah mekanisme nonloading akibat pematangan hidrokarbon. Distribusi kedalaman puncak overpressure pada daerah penelitian memiliki hubungan dengan rasio net-to-gross dimana semakin ke arah timur, kedalaman puncak overpressure akan semakin dangkal. Hal ini disebabkan oleh progradasi delta ke arah timur sehingga di bagian timur Lapangan THD di dominasi oleh serpih.

Deskripsi Alternatif :

The THD Field is located in the Lower Kutai Basin, in the eastern part boundary of the Modern Mahakam Delta. The study was performed in the central part of the THD Field. This field is actively producing hydrocarbon, i.e. gas. Unoficially, the stratigraphy in the THD Field is divided into two zones, i.e. Main Zone and Shallow Zone. This study is performed in the Main Zone. This zone belongs to Kampung Baru and Balikpapan groups, which are Middle – Late Miocene in age.

The purpose of this study is to estimate pore pressure, determine top of overpressure, analyse overpressure generating mechanism, and analyse the relationship between overpressure and geologic condition in the study area. The analyses were performed by processing the data from 21 wells in the study area. The data include wireline log (gamma ray, density, sonic, neutron, and resistivity), pressure and temperature data, well report, and vitrinite reflectance.

The result of this research shows that the top of overpressure in the study area is located at the depth around 3500 – 4000 m TVDSS, with the magnitude of pore pressure at the top of overpressure is around 35 – 40 MPa. The overpressure generating mechanism is non-loading due to hydrocarbon generation. The distribution of top of overpressure in the study area has a relation with net to gross, in which the top of overpressure is shallower to the east. This circumstance is caused by deltaic sediment progradation to the eastern part of the study area, and therefore, the more to the eastern part of the study area, the shallier the sediment.


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