3D seismic data integration to recommend drilling of PTT area, North Sumatra Basin

Abstract

Abstract Northwest of PTT (Paluh Tabuhan Timur) area is an anticlinal structure that has a proven hydrocarbon production reservoir of zones Z-860, Z-910 and Z-950 at 500 - 800 ms (TWT) as observed on the 2D seismic data and from the log interpretation. The drilling program being developed in this area has encountered some problems, specifically dry holes have been found in one out of four wells drilled in the area. The problem is possibly influenced by local stratigraphic conditions or undetected minor faults not previously recognizable in the 2D seismic data or through the well log correlations. An interactive approach utilizing 3D seismic data, synthetic seismogram processing (including seismic modelling), recent exploration and development drilling data (well logs), will hopefully solve these problems. 3D seismic data interpretation has been shown to be effective in identifying local stratigraphic changes and minor faults which were undetected by the 2D seismic data interpretation. Qualitatively, it can be seen that the signal frequency and resolution of the 3D seismic data is relatively higher at the production zone (Top Lower Keutapang). The integration of 3D seismic with the other field data available has led to an improved definition of potential stratigraphic and fault traps in the field. This will allow the formulation of a more precise drilling program to delineate the field with a low risk of dry holes.