Depositional environments and source rock investigations of the Oligocene to Middle Miocene deposits in the Ardjuna Basin, offshore Northwest Java, Indonesia

Miscellaneous · Tue Jan 01 00:00:00 EST 1991

OSTI ID:6088082

Wu, Chiahsin Charlie

Investigations of depositional environments, paleogeographic evolution, source rock potential/maturity, and petroleum generation, expulsion, migration and accumulation were performed on the Oligocene to Middle Miocene deposits in the Ardjuna Basin, offshore Northwest Java, using integrated geologic, seismic and geochemical approaches. The Oligocene to Middle Miocene sediments were deposited in a generally transgressive sequence. It is the most prospective stratigraphic unit for petroleum exploration in the Ardjuna Basin. The rocks comprise three Formations: Talang Akar, Baturaja and Cibulakan. Paleogeography of six stages within the study interval, showing the degree of marine transgression were mapped based on integrated biostratigraphic, paleoenvironmental, and seismic-stratigraphic data. The coals and carbonaceous shales deposited in the deltaic and nearshore environment of the Talang Akar Formation are petroleum source rocks for the waxy oils produced in the Ardjuna Basin. The organic matter contains predominantly vitrinite maceral and up to 30% exinite maceral. Source rock temperature, after calibration with vitrinite reflectance, provides an accurate quantitative measurement for predicting the level of thermal maturation. Two geochemical approaches were used and compared in petroleum resource assessment: petroleum yield (S1) method and genetic potential (S2) method. The oil generative kitchen, the Ardjuna depocenter, has the best opportunity for new oil discovery. This model has since been proved by subsequent drilling leading to several oil discoveries in the last two years.

• Research Organization: Texas Univ., Dallas, TX (United States)
• OSTI ID: 6088082
• Resource Relation: Other Information: Thesis (Ph.D)
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
01 COAL, LIGNITE, AND PEAT
COAL DEPOSITS
EXPLORATION
INDONESIA
PETROLEUM DEPOSITS
RESOURCE POTENTIAL
DEPOSITION
ENVIRONMENTAL TRANSPORT
EXINITE
GEOCHEMICAL SURVEYS
GEOLOGIC HISTORY
GEOLOGIC SURVEYS
MATURATION
ORGANIC MATTER
REFLECTIVITY
RESERVOIR TEMPERATURE
SEDIMENTARY BASINS
SEISMIC SURVEYS
SOURCE ROCKS
VITRINITE
ASIA
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
ISLANDS
MACERALS
MASS TRANSFER
MATTER
MINERAL RESOURCES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RESOURCES
SURFACE PROPERTIES
SURVEYS
020200* - Petroleum- Reserves
Geology
& Exploration
011000 - Coal
Lignite
& Peat- Reserves
Geology
& Exploration