Publications

Recorded 27 oilfields in North East Java were discovered and developed mainly before the 2nd World War. Two stratigraphical intervals of Upper Miocene and Pliocene age yielded some 150.000.000 barrels of oil. The main reservoirs, quartz sandstones and calcarenites, are only locally developed. Productive structures are shallow culminations in elongate, narrow and asymmetric anticlines, east to west directed. Accumulation of petroleum into the traps, caused by primary migration, is mainly governed by age of folding and depth of burial.