Indonesia's complex array of hydrocarbon-bearing situations comprises a major oil and gas province where commercial production dates from 1885.

Discovered reserves are discussed in terms of prospect concepts (exploration plays), a categorised integration of source, reservoir and trap requirements.

Functional stratigraphic and tectonic factors are thereby directly related to various plays, and these to quantity and quality of oil and gas discovered.

Recent exploration efforts are designed to fully assess Indonesia's petroleum potential within a climate determined by integrated national aims.


Le système complexe des gisements pétroliers indonésiens comprend une province majeure en exploitation depuis 1885.

Les réserves découvertes sont discutées selon le concept de prospects (modèles d'exploration), inté- grant les données nécessaires à l'existence d'un gisement: roche-mère, réservoir, piège. On lie directement des paramètres fonctionnels stratigraphiques et tectoniques aux différents modèles et ceux-ci à la quantité et à la qualité du pétrole et du gaz découverts.

Les efforts d'exploration récents sont conçus pour mieux définir les possibilités pétrolières de l'Indonésie dans un contexte déterminé par un but national global.


hydrocarbons. Six different play-types, each with their own unique exploration and hydrocarbon character, are recognised within Indonesia's Tertiary Basins. Empirically, based upon exploration to date, each play-type appears to have a different degree of hydrocarbon potential. An understanding of these productive play-concepts establishes a basic reference for analysis of present activity and future exploration prospects.

Oil production in Indonesia began in 1885, from the Telaga Said Field in the North Sumatra Basin. Today, oil is produced from more than sixty fields onshore and seven fields offshore, within fifteen Tertiary Basins in the archipelago. Average daily crude oil production was 1.34 million bd in 1973 and is expected to increase to 1.57 million bd in 1975.

Exploration in Indonesia has increased dramatically since late 1966, following implementation of production-sharing contracts by the national oil company,


This activity has resulted in numerous discoveries, laying the foundation for extensive future exploration. Cycles of sedimentary deposition In this paper, we analyse and categorise oil- and gas-producing situations in Indonesia by "exploration play concepts" or "play-types", comprising the combination of basic factors that control pooling of by R. A. SOEPARJADI, G. A. S. NAYOAN, Pertamina, 6 Jalan Perwira, Jakarta, Indonesia LESLIE R. BEDDOES, JR., Cities Service East Asia, Inc., Singapo

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