Publications

The reservoir characterization study performed on the Sisi-Nubi field illustrates the important benefits that can be provided by integration of geophysical, geological and reservoir data to better characterize reservoirs and assess hydrocarbon volumes. Sisi-Nubi are two gas fields recently developed by Total E&P Indonesie, situated 25 km offshore off modern Mahakam Delta, representing the most distal fields in the Mahakam PSC/Tengah JOA. The reservoirs of Sisi-Nubi (Upper Miocene) are located at a depth of between 1900-3800 mSS. They are divided into two main units: “Fresh Water Sands (FWS) and “Sisi Main Zone (SMZ). The limit of those units, the MF6 marker, corresponds to the change from the hydrostatic pressure regime (which prevails throughout the FWS) to a higher pressure regime below this marker. Structurally, the fields are characterized by tilted panels separated by major NNE-SSW faults, the result is 6 main compartments (4 in Nubi, 2 in Sisi) which are dynamically independent. Hydrocarbon trapping is provided by the combination of dip and fault closures (FWS) and stratigraphic (shaling out - SMZ). The fluid is mainly gas (with some oil zones), the columns vary from 20 to 100m for FWS (average 45m in the channels) but are more uncertain in SMZ. A low relief structure, a fault definition, contact uncertainty, and petrophysical interpretation in low resistivity contrast are among the elements that have been addressed during the reservoir characterization study.