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All Journal Berita Sedimentologi
Wulandari, Diah Retno
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Earth & Planetary Sciences

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East Java Basin Carbonate Reservoirs: Time Control on Reservoir Character Darman, Herman; Abigail, Stevany; Lamba, Lisa Christi; Wulandari, Diah Retno; Ascaria, Alit; Prasetya, Lilik
Berita Sedimentologi Vol 51, No 1 (2025)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2025.51.1.462

Abstract

The East Java Basin, a prolific back-arc basin in Indonesia, hosts significant hydrocarbon accumulations within Cenozoic carbonate reservoirs. This study explores the link between carbonate age, fossil assemblages, and reservoir characteristics. The oldest reservoir, the Ngimbang Formation, dominated by large foraminifera and interbedded shale, exhibits limited vertical growth potential. Conversely, the Oligo-Miocene Kujung Formation, rich in coral reefs, boasts the basin's highest hydrocarbon content. Pliocene Globigerina sands offer excellent reservoir quality due to both inter- and intra-granular porosity, but their distribution is restricted. This work analyzes the variations in reservoir properties (porosity and permeability) influenced by these distinct fossil assemblages across the formations. Additionally, comparisons of formation geometries and their impact on hydrocarbon trapping are addressed. By understanding these factors, the paper explores the potential for identifying hidden reservoirs within the basin for future exploration.
Co-Authors Abigail, Stevany Alit Ascaria, Alit Darman, Herman Lamba, Lisa Christi Prasetya, Lilik