RESERVOIR CHARACTERIZATION AND MODELING OF AN UPPER MIOCENE DEEPWATER FAN RESERVOm, GENDALO FIELD, KUTAI BASIN, OFFSHORE EAST KALIMANTAN

摘要

The Gendalo Field is the largest of several deep-water gas discoveries in offshore East Kalimantan. The primary reservoir, the Upper Miocene Gendalo 1020, contains thin-bedded turbidites [median sand bed thickness is less than 3 inches/7.5 cm; average sand bed thickness is approximately 15 cm] deposited at the base-of-slope as a largely unconfined fan. Three internal units were mapped based on 3D seismic data and four wells. An object-based facies modeling and experimental design approach were used to: a) build static geocellular models, b) generate gas-in-place distributions, c) understand the key uncertainties, and d) provide models for dynamic flow simulation. Static and dynamic models for this reservoir incorp'orate lobe and channel geobody sizes from an analog Pleistocene fan located 170 km to the northeast. Three depositional styles were modeled: (1) 90% lobes with 10% channels, (2) 70% lobes with 30% channels, and (3) 100% channels. The models were populated with petrophysical properties from well data including net-to-gross, porosity, permeability, water saturation, and gas formation volume factor. Net-to-gross and structure were found to be the most important parameters in determining the gas-in-place distribution.