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The Gendalo field is located in the Makassar Strait, offshore from the eastern coast of the island of Borneo, East Kalimantan, Republic of Indonesia (Figure 1). The field lies approximately 60 km. southeast of the Mahakam Delta in 2,500 - 5,200 ft of water. The Gendalo structure is a broad, four-way dipping anticlinal structure covering an area of approximately 150 km2 or 37,000 acres. Miocene basin floor fan deposits are the primary pay sands within a structure that formed as a result of regional compression during Late Pliocene time. The Gendalo gas field is delineated by three-dimensional seismic, four wells, wireline logs, reservoir pressure data and 870 ft of core. The reservoir is characterized by thinbedded sand (most sand beds are less than 3 cm thick, though a few are 5-10 cm thick) and shale sequences. The depositional environment of these Miocene sands at Gendalo is turbidite deposition that ranges from channelized sequences to unconfined fan lobes.