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East Java Shallow Water Carbonate Growth and Drowning - Correlation to Reservoir Quality

Zeiza, Adam D.¹; Van Simaeys, Stefaan¹; Musgrove, Frank²; Sekti, Rizky¹
¹Exploration, ExxonMobil (MCL), Jakarta, Indonesia.
²Development, ExxonMobil (MCL), Jakarta, Indonesia.

The depositional history of the Oligo-Miocene isolated carbonate platforms in the East Java Basin has been of great interest to both industry and academia as some of the largest and most prolific hydrocarbon accumulations in Indonesia are trapped in these shallow water buildups. Here we investigate the potential for highly detailed sequence dating by having thorough biostratigraphy and chemostratigraphy studies within and between individual isolated carbonate platforms that will lead a detailed growth and drowning history for the Cepu area. With that detailed growth history of ages and thicknesses, subsidence and accumulation rates can be derived and compared to rock quality to confirm models of drowning. Diagenesis thought to be the main controls on reservoir quality in these Oligo-Miocene fields. The intent of this study is to establish the absolute timing of the initiation, growth and demise of the Cepu carbonates in order to unravel the relative influence of regional and local tectonics, sea level variations and erosion. Shallow water carbonate deposition was progressively terminated through time from west to east due to differential subsidence. This study provides a new and more detailed understanding of the interplay between tectonics and carbonate sedimentation in the East Java basin.

 

AAPG Search and Discovery Article #90155©2012 AAPG International Conference & Exhibition, Singapore, 16-19 September 2012