Publications

Age dating (biozonation) and correlation play an important role in oil exploration. Unfortunately, many factors can cause “noisy biostratigraphic data, producing frequent inconsistencies in relative order of events, and resulting in reduced resolution of biozonation and correlation. In the Jabung Block, South Sumatra Basin, a quantitative biostratigraphy method was applied in order to improve resolution and allow more precise biostratigraphic zonation and correlation.Probabilistic analysis (ranking and scaling [RASC]) of Oligocene to lower Middle Miocene sections in 10 wells has enabled a higher precision of correlation and biozonation-. The analysis of 317 last occurrence biostratigraphic events representing foraminifera, nannofossils and palynomorphs, and 7 marker horizons, has yielded a total of 52 events, including 11 unique events, and that have proven to be reliable for quantitative biozonation and correlation.An eight-biozone scheme is proposed, labeled Zones I through to VIII. The new biozonation scheme allows improved “dating of the study sequences in wells that do not contain diagnostic age markers. The estimated depths of the 52 events that include marker horizons, and their calculated error ranges, provide significantly reliable datums for correlation.