Northwest Java

 

Onshore Northwest Java

West Java tectonic map summary showing the location of the sedimentary basins and half-graben depocenters (Modified after Kohar et al, 1996).

West-East geological cross-section of onshore West Java. There is a series of high and low structures. Talang Akar and Jatibarang are mainly Oligocene deposits. Baturaja and Cibulakan are Miocene in age. The Cisubuh Formation is dominated by Pliocene sediments. The formation naming of the lower section is similar to the South Sumatra Basin, and the upper section is the same as the offshore part of the basin (Martodjojo, op. Cit. Nopyansyah, 2007, in Nugroho et al, 2020).

Seismic expression of the geological features onshore Northwest Java. Lines CLM10-CLM 16-KDM19. Source Pertamina Unit III, Seismic reflection survey 1977-1978, party 231 07 61, contributed by A. Pulunggono 

Sunda - Asri Basin (Southeast Sumatra Basin)

The Asri and Sunda Basins are located offshore Southeast Sumatra under the SE Sumatra Production Sharing Contract (PSC). Currently, Pertamina Hulu Energi OSES operates in the Asri and Sunda Basins, known as the Southeast Sumatra (SES) Block (Figure 1).

Source: Ralanarko, D. Wahyuadi, D., Nugroho, P., Syafri, Almabrury, A., and Nur, A. A., 2020, Seismic Expression of Paleogene Talangakar Formation - Asri & Sunda Basins, Java Sea, Indonesia, Berita Sedimentologi #46

Fig.1. Southeast Sumatra Block

Fig. 2. Basin configuration of Sunda and Asri Basin with some structural components.

Fig. 3. Typical N-S seismic cross section, Sunda Basin

Fig. 4. West-East seismic section across Sunda Basin

Fig. 5. Seismic section across several fields in the region, from Zelda, Tati, to the border with ONWJ Block.

Fig. 6. North-South oriented seismic section across Asri Basin, in the north of the area.

Fig. 7. West - East oriented seismic section across Asri Basin.