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The basal wedge of Tertiary sediments in the South Sumatra Basin was deposited during a transgressive cycle that extended from Late Eocene to the Middle Miocene. These sediments were deposited in continental to fluviatile-shallow marine environments, on a surface of pre-Tertiary rock that had considerable topographic relief. The area of the basin discussed in the paper is shown on Figure 1. The western margin of the basin is structural and placed at the outcrop of the pre-Tertiary rocks along the edge of the Barisan Mountain Range. The eastern and southeastern margins are the depositional basin edges on the Sunda shield and the Lampung high. To the northwest the basin area is open ended and extends toward the Central Sumatra Basin. The amount of information available for this study ranges from reasonably complete geologic and geophysical coverage in the Stanvac blocks to sparse, reconnaissance information from the basin edge and from the areas operated by other companies. In addition, not many wells reached the pre-Tertiary section in the deeper parts of the basin. Hence, some of the interpretations presented here are speculative and subject to modification when new data become available.