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Depositional system of the Talang Akar Formation in the northern area of the Jatibarang Sub-basin, offshore Northwest Java, Indonesia



Depositional system of the Talang Akar Formation in the northern area of the Jatibarang Sub-basin, offshore Northwest Java, Indonesia



Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists 1999: A34



Oil and gas accumulations in the northern, offshore part of the Jatibarang sub-basin were discovered in the early 1980's. The "O" Area fields are located within the Offshore Northwest Java (ONWJ) PSC in the northern area of the Jatibarang sub-basin. The first field discovery in this area was the "OO" structure in 1980. By 1985, 30 exploration and delineation wells were drilled in the "O" area with hydrocarbon accumulations discovered in 14 structures. The major part of the reserves are in Talang Akar reservoirs that are coarser grained and have higher net sand/gross interval ratios compared to the time-equivalent interval in the major producing Arjuna sub-basins, 80 km to the west Based largely on core descriptions, these heterogeneous coarse-grained and muddy deposits along a major northern border-fault system were initially interpreted as alluvial-fan stream and debris-flow deposits. In the 15 years since discovery of these Talang Akar accumulations, sedimentological study of heterogeneous coarse-grained deposits and application of ichnology, or trace fossil study, has led to major improvements in the determination of depositional environments. Cores from the Talang Akar interval were reevaluated in the light of new sedimentologic and stratigraphic concepts to provide insights into the stratigraphic framework and re-characterize the reservoir facies. The trace-fossil assemblages in the host mudstone-sandstone facies represent brackish water and marginal marine environments.

Accession: 018696878

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