Publications

Mahakam delta is located in Tertiary Kutei basin, hosts significant hydrocarbon resources within Miocene deltaic systems. The productive zone is composed of Mid-Miocene to Pliocene deltaic sediments and located on NNE-SSW trending anticline formed during Late Miocene to Pliocene compression. The multilayer reservoir consists of stacked deltaic reservoirs mainly formed by distributary channel deposits along with delta front mouth bars. Core sample taken from Tambora, Tunu-Peciko and Nubi fields show the typical reservoir type in internal, median and external axis of Mahakam Delta respectively. These cores represent the succession of deltaic environment from upper and lower distributary channels, distributary mouth bar, distal delta front bar and prodelta. Low resistive pay reservoir is very common in deltaic system and can be easily overlooked in exploration and development phase. The low resistive pay zone Mahakam area mostly found in distal facies as it is mainly related to thin beds, finer grain size, clay distribution, bioturbation and any combination of these factors. However, some cores from proximal facies as found in Tambora also shown the low resistive feature which is commonly associated with channel abandonment and zone of conductive minerals precipitation. The low resistive pay reservoirs as bypassed potentials are challenging to recognize and interpret. However, by combining the log interpretation, core analysis and supporting outcrop studies, these potentials may contribute to unlock the remaining stakes in deltaic environment.