--> Seal Potential of the Talang Akar Formation, BZZ Area, Offshore Northwest Java, Indonesia, by J. G. Kaldi and C. D. Atkinson; #90986 (1994).
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Abstract: Previous HitSealNext Hit Potential of the Talang Akar Formation, BZZ Area, Offshore Northwest Java, Indonesia

John G. Kaldi, Chris D. Atkinson

The Previous HitsealNext Hit potential of various lithologies in the Upper Oligocene Talang Akar Formation (TAF) in the BZZ area of offshore northwest Java is evaluated. Previous HitSealNext Hit potential comprises (1) Previous HitsealNext Hit capacity (the calculated amount of hydrocarbon column height a lithology can support), (2) Previous HitsealNext Hit geometry (the structural position, Previous HitthicknessNext Hit, and areal extent of the lithology) and (3) Previous HitsealNext Hit integrity (rock mechanical properties such as ductility, compressibility, and propensity for fracturing). Previous HitSealNext Hit capacity was determined by mercury injection capillary pressure (MICP) analyses. Previous HitSealNext Hit geometry was derived by integrating seismic data, core, detailed well correlations, regional sedimentological/stratigraphic relationships, and comparisons to known depositional analogs. Previous HitSealNext Hit integrity was evaluated qualitati ely by core examination, bore-hole imaging, and petrographic studies. These three variables were integrated and ranked semi-quantitatively. In the BZZ area, deltaic distributary channel sandstones and delta-front/mouth bar heterolithic sandstones comprise the main reservoirs. Possible seals include pro-delta, delta front, and delta plain shales, channel abandonment silts, and transgressive shelf carbonates in both the upper and lower TAF. Previous HitSealNext Hit potential is best in the delta front shales, which have high Previous HitsealNext Hit capacity, are thick, laterally continuous, and very ductile. Previous HitSealNext Hit potential is moderate in the thicker (upper TAF) transgressive carbonates. These rocks have high Previous HitsealNext Hit capacity and excellent lateral continuity, but are brittle and hence prone to fracturing. Delta plain shales and pro delta shales are poor seals due to their limited Previous HitsealNext Hit capacity (delta plain shales) or because they are too thin (pro-delta shales). Channel abandonment siltstones have even poorer Previous HitsealNext Hit potential because of small lateral extent and limited Previous HitsealNext Hit capacity. The least favorable Previous HitsealTop potential occurs within the thin (lower TAF) carbonates. These rocks are relatively thin as well as being prone to fractures.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994