بررسي آميختگي نفت ها در مخزن آسماري ميدان قلعه نار

Investigation of oil mixing in the Asmari reservoir in the Qalenar oilfield

There are three oil families in west and southwest of Dezful embayment. Tertiary oils which are derived from Pabdeh Formation. This petroleum system distributes in the north edge of the area is distinctly identified in the Labe Sefid oil field. Whereas, the presence of Jurassic petroleum system is evident in the southwestern part of the area. This group is derived from Sargelu and distributed in Dalpari, Cheshmekhush, West Paydar and East Paydar oil fields in southwest of the Dezful embayment. The third oil family is identified in Qalenar oil field. The crude oil in the Qalenar oil field is of a special type in a sense this oil shows little correlation with any of two known source rocks. Based on their distribution in overlain reservoirs and it is concluded that these crude oils are mixtures of hydrocarbons sourced from Tertiary and Jurassic source rocks. Therefore, the crude oils in Qalenar oil field are produced mainly from Pabdeh source rock. But, thermal history profiles indicate that the organic-rich Pabdeh Formation encountered in most of the wells in the southwest of Dezful embayment is immature and has not yet yielded commercial quantities of hydrocarbons.