The northwestern Java Basin in Indonesia is a prolific hydrocarbon province that has attracted extensive exploration and production activities for many decades. The morphology of the basin, as imaged by seismic data, suggests several features that may be attributed to a remnant volcanic system. The basin is filled with an epiclastic sequence comprised of various alluvial deposits, as well as pyroclastic, volcanogenic and lake sediments. The lowermost sequence rests uncomformably on fractured/rubbled Upper Mesozoic basement rocks, and consists of pyroclastics, volcanogenic and sedimentary rocks of the Jatibarang Formation. The volcanic rocks occur as primary proximal volcanic deposits inter-layered with fall volcanic rocks (tuff and tuffaceous sand). In turn,<br>the Jatibarang Formation is unconformably overlain by fluvial, deltaic and marine sedimentary rocks of the Talang Akar Formation. In comparison to the Jatibarang tuffs, the Talangakar tuffs are more basaltic in composition and have a greater amount of subvolcanic lithic rock fragments (coarse-grained volcanic rock), which consist of diabase and microdiorite. Log analysis revealed a proximal to distal distinction between the volcanic facies, pyroclastic to volcanogenic clay content, and diagenetic modification due to mineralogical instability of the volcanic section. The reservoir potential may have been preserved within the naturally fractured volcanic rocks. Both formations are considered to hold viable petroleum plays provided by the inter-woven volcanism- sedimentation processes and multiple subsequent tectonic activities during inversion.


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