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Facies Model of Clastic Reservoir in Pre-Talang Akar Formation, Melandong Area, North West Java Basin, Indonesia

Ory Sadjati1, Asep Samsul Arifin2, and Vickry Rowi3
1Technology Support Division, Pertamina Upstream, Jakarta, Indonesia
2Pertamina EP, Jakarta, Indonesia
3Geotech System Indonesia, Jakarta, Indonesia

Recent drilling successes in the Pre-Talang Akar Formation (Pre-TAF) of the Northwest Java Basin have proved this formation to be an important and viable exploration target. The discovered layers are a member of many layers of the Pre-TAF which resulted from combination between tectonic and stratigraphic evolution in the Paleogene. Because of this layers are change laterally, so it is important to know the stratigraphy and the facies model of these producing layers.
To understand the facies model, the interesting layers with maximum amplitude are mapped, and also supported with correlation in Pre-TAF by using five exploration wells in this area. Some seismic attributes such as; RMS amplitude, spectral decomposition and sweetness are used for detecting the lateral changes in stratigraphy, focusing the window on the interesting stratigraphy sequence.
These seismic facies have been integrated with the geological data to construct a depositional model for the field. Combining to physical properties high amplitude and low frequency will indicate to the hydrocarbon absorbtion effects within the reservoir.
In summary, the interesting facies could be identified from the west to the east area. The facies models are interpreted as a part of the clastic channel distribution separated by NW-SE fault zone. This new interpretation can give the best play of hydrocarbon trapping in the Pre-Talang Akar Formation and can provide encouragement for further exploration and appraisal drilling.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece