Integration of sequence stratigraphy, rock physics and AI inversion to determine the prospective reservoir in the shelf environment of the Tarakan Basin, Indonesia

• Published in: IOP conference series. Earth and environmental science 2021-10, Vol.873 (1), p.12037
• Main Authors: Irsyad, M, Tampubolon, B T, Sukmono, S
• Format: Article
• Language: English
• Subjects: Acoustic impedance; Basins; Data analysis; Gamma rays; Integration; Inversion; Physics; Pliocene; Reservoirs; Rocks; Stratigraphy; Water wells; Well data
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/873/1/012037

The Tarakan Basin is one hydrocarbon basin in Indonesia with approximately 40 discoveries and more than 1000 MBOE reserves. This study discusses an approach to integrate the sequence stratigraphy, rock physics and acoustic impedance (AI) inversion analysis to determine the prospective reservoirs in the basin. PRG-1 well data is used in the sequence stratigraphy and rock physic analysis. The sequence stratigraphy analysis of PRG-1 shows that there are three system tracts: transgressive, low stand tract and high stand system tracts. The integration of sequence stratigraphy, rock physics and log data analysis show that the prospective reservoir interval in PRG-1 well is located at a depth of 4730-4780 feet. It is characterized by low gamma ray, low NPHI, low density and high resistivity. The prospective interval was deposited in early Pliocene as Tarakan Formation in the low stand system tract of shelf depositional environment. The AI map shows that the distribution of the prospective is around the PRG-1 and in the eastern part of the area.