Publications

Mahoni field has set 11 MMBO oil production record since 2001. Peak production of 10000 BOPD was recorded in 2002-2003. Ever since, production had been gradually in decline to below 900 BOPD in 2009. Under certain situation, Mahoni field is economically challenging. Mahoni field consists of multiple fault compartments and reservoirs. It is a complex hydrocarbon trap where parallel faults splay out from the major Sepinggan bounding fault. Such structural pattern provides a pocket of oil bearing structure that accommodates Miocene oil in across Mahoni field. Upper and Lower Yakin reservoirs are extensively distributed across Sepinggan field and Yakin field. In Mahoni field, the two reservoirs produce almost 4.4 MMBO. The extension of Lower Yakin in the Mahoni West remains undefined while deepening to the West was challenged by the fact that existing surface facilities are a distance away from the potential prospect location. It can cause high inclination and long distance well trajectory when using the existing facilities. The multi disciplines subsurface team has taken an integrated approach. The new concept called “deepening to the West” includes but not limited to seismic interpretation, multiple seismic attribute analysis, reservoir characterization and fault recompartmentalization. Revisiting old seismic interpretation and building new structural framework have changed the closure orientation * Chevron Indonesia Company ** SIS Schlumberger significantly. Multiple seismic attribute analysis has helped finding hydrocarbons remnants and has helped showing location of extended reservoir distributions. The study confirms potential target in the area for further development. Two high inclination and long distance wells were put in place in 2011. Those wells were successfully penetrated the entire sequence of Lower Yakin, better defined reservoir extension to the West and explained the hydrocarbon trapping mechanism. Three follow up wells are proposing to be drilled in 2013-2014 as a result of the current study.