Petroleum geology of South Sumatra, Indonesia
The South Sumatra basin resulted from horst-graben structures formed from the end of Cretaceous to the early Tertiary. During the Pliocene-Pleistocene orogeny, prominent northwest-trending folds and strike-slip faults were formed within the basin. The depositional history of South Sumatra is similar to the prolific Central Sumatra basin; however, the reservoir sandstone facies in South Sumatra are less well developed. Four major orogenic events resulted in the present framework of the South Sumatra basin. These events occurred during (1) a mid-Mesozoic orogeny which metamorphosed, faulted, and uplifted previously deposited sediments into blocks; (2) the Late Cretaceous-early Oligocene tectonic event with resultant horsts and grabens that controlled Eocene sedimentation; (3) the late Oligocene-Miocene, a period of isostatic subsidence until its tectonic quiescence was broken by middle Miocene diastrophism in the Barisan Mountains and by minor structural movements; and (4) the widespread Pliocene-Pleistocene orogeny reflected in the shallow structures in the Tertiary sediments. The southwestern part of Sumatra corresponds to the uplifted range that folded during the Miocene. Only the Tertiary Lahat (Lamat) and Talang Akar formations were deposited in rugged pre-Tertiary topography. The contact between the Sumatra block and the Sunda-Java block is a north-south-trending right-lateral wrench fault. The anticlines within the South Sumatra basin can be grouped into three groups of anticlinal features. The major anticlinora consist of over 150 individual anticlines. To date, about 50 of the 100 structures tested have proved production. Shales in the upper Oligocene-lower Miocene Talang Akar and lower-middle Miocene Gumai (Telisa) Formations show excellent potential for oil generation.
- OSTI ID:
- 5865703
- Report Number(s):
- CONF-870606-
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Vol. 71:5; ISSN AABUD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
ASIA
CENOZOIC ERA
CRETACEOUS PERIOD
DEVELOPING COUNTRIES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOLOGY
INDONESIA
ISLANDS
MESOZOIC ERA
MINERAL RESOURCES
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
RESERVOIR ROCK
RESOURCES
SEDIMENTARY BASINS
SOURCE ROCKS
TECTONICS
TERTIARY PERIOD