Evaluating the Reservoir Quality of the Darian Formation Using Well Logs: A Case Study of One of the Offshore Oil Fields in the South Pars Oilfield

Abstract

The current paper aims to examine these parameters for evaluating the reservoir quality Darian Formation situated in one of the South Pars hydrocarbon fields. Also, zoning of the Darian Formation sequence is conducted for this reservoir. The average petrophysical parameters calculated in the Darian Formation sequence, including shale volume, total porosity, and water saturation, are 0.21%, 20.91%, and 81.6%, respectively. Based on these values, the sequence of the Darian Formation is divided into eight different zones. Zone 4 showed the highest reservoir quality, with a depth of 2367 to 2384 meters and a porosity of 22.8%, has the highest porosity, lowest water saturation of 37.1%, and about zero Shale volume. Zone 1 showed the weakest reservoir quality, with a depth of 2337 to 2353 meters and a porosity of 13.6%, has the lowest porosity, water saturation was about 89.19%, and about 5% Shale volume. Furthermore, neutron-density, MID, and M-N cross plots combined lithology in the Darian Formation sequence for calcite, quartz, dolomite, and limestone, and low amounts of shale in the well are identified.