Structure, stratigraphy, and hydrocarbons offshore southern Kalimantan, Indonesia
Offshore southern Kalimantan (Borneo), Indonesia, the Sunda Shelf is bounded on the south by the east-west-trending Java-Madura foreland basin and on the north by outcrops of the granitic core of Kalimantan. Major northeast-southwest-trending faults created a basin and ridge province which controlled sedimentation at least until early Miocene time. Just above the unconformity, the oldest pre-CD Limestone clastic strata are fluviatile and lacustrine, the remainder consisting largely of shallow-marine, calcareous shale with interbeds of fine-grained, quartzose sandstone. A flood of terrigenous detritus - Kudjung unit 3 - resulted from post-CD Limestone uplift, and is more widely distributed. Unit 3 consists largely of fluviatile sandstone interbedded with shale and mudstone, grading upward to marine clastics with a few thin limestones near the top. The resulting Kudjing unit 2 is largely a shallow-basinal deposit, comprising thin, micritic limestones interbedded with calcareous shale and mudstone. Infilling of the basins was nearly complete by the end of Kudjing unit 1 deposition. Eastern equivalents of Kudjing units 1 and 2 are known as the Berai limestone interval (comprising bank, reefal, basinal, and open-marine limestones, and marl). Of the three oil fields in the area, two are shut in, but one has produced nearly 100 million bbl. Gas shows were recorded in most wells of the area, but the maximum flow was 1.8 MMcf methane/day, although larger flows with high percentages of carbon dioxide and nitrogen were reported. Fine-grained clastic strata of unit 3 are continuous with those farther south, where geochemical data indicate good source and hydrocarbon-generating potential. Sandstones with reservoir capability are present in the clastic intervals, and several carbonate facies have sporadically developed porosity. A variety of structural and stratigraphic traps is present. 20 figures, 1 table.
- Research Organization:
- Tenneco Oil Co., Houston, TX
- OSTI ID:
- 7028079
- Journal Information:
- Am. Assoc. Pet. Geol. Bull.; (United States), Vol. 64:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
INDONESIA
PETROLEUM GEOLOGY
PETROLEUM DEPOSITS
GEOLOGIC STRUCTURES
STRATIGRAPHY
CARBON DIOXIDE
EXPLORATION
GEOLOGIC FAULTS
HYDROCARBONS
LIMESTONE
METHANE
NITROGEN
OFFSHORE SITES
OIL FIELDS
PRODUCTION
SANDSTONES
SHALES
TERTIARY PERIOD
ALKANES
ASIA
CARBON COMPOUNDS
CARBON OXIDES
CARBONATE ROCKS
CENOZOIC ERA
CHALCOGENIDES
DEVELOPING COUNTRIES
ELEMENTS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
ISLANDS
MINERAL RESOURCES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
580100* - Geology & Hydrology- (-1989)
020200 - Petroleum- Reserves
Geology
& Exploration