Document Type: Research Paper
Department of Geology,National Iranian South Oil Company, Islamic Azad University (IAU), Tehran, Iran
Department of Geology ,Faculty of Sciences , University of Tehran, Tehran, Iran
Department of Geology, Science and Research Branch, Islamic Azad University (IAU), Tehran, Iran
The the Middle Cretaceous-Lower Miocene petroleum system of the Kupal oil field, located in the Dezful Embayment has been studied. The Kazhdumi and Pabdeh are main source rocks, the Sarvak, Ilam and Asmari formations are reservoir and the Gachsaran formation is the seal rock. According to geochemical analysis the Kazhdumi and Pabdeh contributed to oil production and feeding the Asmari and Bangestan reservoirs. Also, the lateral migration from the Kupal to other fields is ruled out but vertical migration led to feeding the Asmari and Bangestan reservoirs. Considering burial history diagrams in the syncline area between the Marun and Kupal fields, expulsion phases from the Kazhdumi were about 9 and 7 million years ago, respectively. Also in the crestal axis area of these structures (about 6 and 4 million years ago), the hydrocarbon generation and expulsion started from the Kazhdumi Formation. In the syncline area between the Marun and Kupal oil fields, the Pabdeh source rock has entered the hydrocarbon generation and expulsion phases approximately 6 and 3 million years ago, respectively. Based on 3D hydrocarbon system modeling, the oil volume generated from the Pabdeh and Kazhdumi in the Kupal are estimated to be 42 and 113 billion barrels, respectively.