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The Asri and Sunda Basin are located offshore Southeast Sumatra under the SE Sumatera Production Sharing Contract (PSC). Currently, Pertamina Hulu Energi OSES operates in the Asri and Sunda Basins, known as Southeast Sumatra (SES) Block. As one of Indonesian prime oil and gas producing area in the past 50 years, these basins have produced cumulativ...
Citations
... Objektif penelitian ini belum pernah diteliti secara detail oleh peneliti sebelumnya. Gambar 1. Lapangan Widuri dalam Cekungan Asri (Ralanarko, 2020) Penelitian dilakukan dengan melakukan analisis terhadap variasi fasies secara lateral maupun vertikal dan geometri reservoir produktif berumur Oligosen -Miosen, Formasi Talangakar, Lapangan Widuri, Cekungan Asri. Penelitian ini membangun model pengendapan reservoir dengan mengintegrasikan data deskripsi batuan inti, data petrografi, data log tali kawat, laporan biostratigrafi, data uji sumur, data seismik 3D, dan penelitian -penelitian sebelumnya. ...
... rift of Asri Basin (Young and Atkinson, 1993) is situated in Offshore Sumatra, Indonesia, and covers an area of approximately 3500 sq. km. It comprises thick sediment from Paleocene to Pleistocene up to 16,000 ft thickness. It is bordered by a downthrown to the west, N-S trending faults to the East, and an NW-SE trending wrench system to the south (Ralanarko et. al., 2020). ...
... Three major tectonics are recognized: pre-rift, synrift, post-rift, which affected the structural style and depositional systems in the Asri Basin (Ralanarko et. al., 2020). The basin acknowledged oil fields have a stratigraphic aspect that is influenced by moderate intrabasinal faulting and folding. Structural control on major axial drainage systems would exert tremendous influence on sand supply to any particular basin at any given time. Basin integration and its control on axial fluvial systems play an ...
... The Lower Zelda and Upper Gita Members are the main components of the Oligocene TAF (Armon et. al., 1995). In INTA/B Field, the Gita-33 series sand comprises the top sequence of Gita Member. One of those series is the Gita-33A sand consisting of sinuous meandering fluvial channel sandstones with northwest-southeast trending (Ralanarko et. al., 2020). A fault with a throw of around 150 ft in the northwest juxtaposes sand against shale. It was collected in the same channel system as VITA field Gita-33 sand during a similar time. ...
INTA/B Field is one of the most producing mature fields in Widuri Area, Asri Basin, Offshore SE Sumatera, Indonesia, therefore it is subjected to rejuvenation to enhance hydrocarbon production. INTA/B Field is distinguished from other fields from its featured anticlinal structures that have the northeast-southwest trending. This structure is heavily faulted mainly in the up-thrown south side of a major normal fault. Two structural configurations with various oil-water contact have successfully been identified within the field. The most of oil reserves are preserved in the western lobe in which Intan-1 sands. One of the most important reservoirs in this field is Talangakar (TAF) sand deposited as a meandering river system that streamed from the northwest to the southeast within the basin. Two main reservoirs, Gita-34A and Gita-34B are correlated throughout the field and interpreted as Miocene fluvio-channel sands. These two channels are thickened moderately from southwest to northeast which has descriptions as follows: fine- to-coarse grains, unconsolidated to friable, and low cementing materials.INTA/B Field has been produced for 25 years and currently undergoing a watered-out phase. Therefore, an integrated study is subjected to overcome this issue for mature field rejuvenation. The integrated study ranged from geology (e.g., depositional environment and facies analysis), geophysics (e.g., revisiting and reprocessing of seismic attributes), petrophysical calculation, and reservoir engineering (e.g., water conformance plot and volumetric calculation).This integrated study has successfully rejuvenated a mature field resulting and added a significant number in oil production with an average of 300 BPOD/well. The extended project is estimated to have a similar result to the forward pilot.
