Determination of Reservoir character of kangan & dalan formation in south pars gas field using wireline logs

The south pars gas field is on of the southwestern fields of iran in zagros sedimentary basing and consists of two kangan and dalan reservoirs. the Kangan and Dalan formations belong to Dehram Group and are the most important gas reservoirs in Persian Gulf area. Petrophysical characteristics in the studied well were evaluated by the data of the well logs and Probabilistic method was used for petrophysical by Geolog 6.6 software. for an accurate evaluations, the necessary corrections were applied on logs by considering the places of wash out, environment effects, gas and shale effects. After that, the lithology of the Kangan and Dalan formations were determined by using of cross plot of neutron – density. Analysis of wire line data shows that the formation is basically limeston and in some part it is dolomite. on the based of Lithology, shale volume, presence of evaporate sediments and porosity, the Kangan formation has been zoned to and, and the Dalan formation has been zoned to and. The results show that the zone of the Kangan formation and the zone of the Dalan formation have on apporiate reservoir in terms of gas saturation level, porosity and lithology as results porosity (PHIE) and water saturation (SWE) were obtained 9/45%, 9/7% for kangan and 8/65%, 8/2% for Dalan formation in average, respectively.