Publications

The Arun gas field was discovered in late 1971. It is located on the northern coast of Aceh Province, North Sumatra, about 230 kilometres northwest of Medan. The reservoir is a north-south trending reefal complex, approximately 18.5 by 5 kilometres in size. The discovery well, Arun-Al, encountered 1080 feet of gas-bearing limestones of Lower-Middle Miocene.The purpose of this study was to establish a detailed reservoir decription of the Arun Limestone for reserves redetermination and reservoir depletion simulation. It was found that the Arun Limestone can be subdivided into three major facies: Reef, Near-Reef andLagoonal. These facies were mapped from core and log data throughout the reef complex in the field area, and the resulting model was superimposed on a 12-layer log zonation of the rock body. Reservoir property maps werethen generated for each layer. The new geological model produced was the key part of the successful reserve redetermination and reservoir simulation study.