GEOLOGICAL SOCIETY OF THE PHILIPPINES
| CENOZOIC CARBONATES IN BORNEO: DEVELOPMENT AND RESERVOIR POTENTIAL |
Moyra E. J. Wilson
Paleogene carbonates developed extensively as shoals and large-scale platforms in eastern Borneo around the margins of basins bordering the Makassar Straits. These carbonates were dominated by larger benthic foraminifera and were rarely affected by subaerial exposure. Neogene carbonate sedimentation occurred in eastern and northern Borneo as large-scale platforms and numerous carbonate buildups. Neogene carbonates contain abundant corals and other aragonitic bioclasts and were often affected by subaerial exposure and leaching. Reservoir potential is best developed in Paleogene carbonates with primary intergranular porosity or secondary fracture porosity. In comparison, Neogene carbonate reservoirs are better developed with secondary biomoldic, vuggy or fracture porosity enhancing original primary porosities and permeabilities.
An understanding of carbonate depositional environments, spatial facies relationships, and diagenesis is essential in order to develop models for these carbonates which can be used as predictive tools in the subsurface. This study also helps to evaluate tropical carbonate development in SE Asia and the evolution of sedimentary environments in Borneo during the Cenozoic.
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