The province contains the Lahat/Talang Akar-Cenozoic total petroleum system with one assessment unit, South Sumatra. The regional marine shale seal, deposited by a maximum sea level highstand in early middle Miocene time, was faulted during post-depositional folding allowing migration of hydrocarbons to reservoirs above the seal. Production is compartmentalized due to numerous intraformational seals. Stratigraphic trapping and faulting are important locally. Carbonate and sandstone reservoirs produce oil and gas primarily from anticlinal traps of Plio-Pleistocene age. Reserves of 4.3 billion barrels of oil equivalent have been discovered in reservoirs that range from pre-Tertiary basement through upper Miocene sandstones and carbonates deposited as synrift strata and as marine shoreline, deltaic-fluvial, and deep-water strata. Eocene through lower Oligocene lacustrine shales and Oligocene through lower Miocene lacustrine and deltaic coaly shales are the mature source rocks. The province consists of Tertiary half-graben basins infilled with carbonate and clastic sedimentary rocks unconformably overlying pre-Tertiary metamorphic and igneous rocks. This records an increase from the previous. Oil and gas are produced from the onshore South Sumatra Basin Province. Indonesia BPS Projection: Population: Sumatra: South Sumatra data was reported at 9610.700 Person th in Dec 2035.
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