Sandstone Facies Model Producing Hydrocarbon in Lower Keutapang, Paluh Tabuhan Timur Area, North Sumatra Basin, Indonesia
Sadjati, Ory, Ari Samodra, Rusalida Raguwanti, Pertamina Upstream, Jakarta, Indonesia
The Paluh Tabuhan Timur (PTT) area,
To understand the facies model of sandstone in Lower Keutapang Formation, the interesting layers with maximum amplitude were mapped. The 3D Seismic data in this area can be interpreted by using 3D interpretation software. The RMS amplitude and the instantaneous frequency were used to detect the lateral changes in stratigraphy, focus the window on the specific sequence interval of interest. These seismic facies have been integration with the geological data to construct a depositional model for the field.
Two distinct facies could be identified on the seismic data, layer1 and layer 2 of the Lower Keutapang Formation are interpreted as the part of the sand distribution pattern from the complex of delta. Combined between high amplitude and low frequency correspond to the gas absorption effects within the reservoir.
In summary, this interpretation can give better play of hydrocarbon trapping in the Lower Keutapang Formation and a strategy for the next drilling. The presences of dry holes in the top structure and in the center area can be evaluated, and we can avoid another of dry holes with this interpretation.