Abstract:

The Salawati Basin is located at the Bird's head of the Papua Island, Eastern Indonesia. The Miocene Kais carbonate in the Salawati Basin is one of the classic targets of the Tertiary in Southeast Asia. The reefs of the Kais Formation are the main producing reservoirs. By study on the basic petroleum geology, especially on the sedimentary characteristics and the Kais carbonate combined with recent new data from the PetroChina International Companies in Indonesia, the sedimentary characteristics of the lagoon facies in the Miocene are further studied, and the types of reefs and traps of the Kais Formation are systematically studied and divided. Four reef traps are classified, and the Kais carbonate can be divided into two parts in framework. There are permeable channels in the lower part of Kais carbonate, which contain steady reefal sediments and can act as migration paths of hydrocarbons. It is very important to recognize the characteristics of the reef traps correctly for further petroleum exploration in the basin。

Key words: Indonesia, Tertiary, lagoon, reef trap, sedimentary facies