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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association


14th Annual Convention Proceedings (Volume 1), 1985
Pages 63-81

Early Middle Miocene Deltaic Progradation in the Southern Kutai Basin

Etty S. Nuay, A. M. Astarita, K. Edwards


Synthesis of geology, paleontology and seismic stratigraphy in a 1200 square km area surrounding Balikpapan Bay, East Kalimantan, has led to the recognition of an eastward prograding delta system, active during Middle Miocene time.

Facies interpretation based on well cuttings and side wall cores from 9 wells combined with approximately 4000 shothole samples from seismic time equivalent rock units in outcrop, provided the frame-work for this synthesis. Subsurface delineation of the 3 main depositional environments was achieved by means of seismic stratigraphy.

It is inferred that this progradation and observed eastward shift of paleoenvironments in this delta and shore complex are the result of uplift during Early Middle Miocene times. The source for these fairly pure, well-sorted and rounded quartzose sediments are probably sandstones of an earlier progradational cycle that was derived directly from the highly granitic Sunda shield.

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