Abstract
Pabdeh Formation is one of the most important source rocks in Zagros basin. In this study, thermal modeling and comparing of hydrocarbon potential evaluation of Pabdeh Formation in Mish Anticline and Gachsaran oil field have been investigated. For this reason, Rock-Eval pyrolysis was carried out on 21 cuttings samples collected from 2 boreholes (Well No. 55 and 83) of Gachsaran oil field and outcrop of Mish anticline. Accordingly, the Kerogen types of Pabdeh Formation in Gachsaran oil field are II, but in Mish anticline are type II and III. The amount of inert organic carbon determined for the Pabdeh Formation in Mish anticline is about 4.879 wt%, while for Gachsaran oil field, it is estimated at 0.153 (Well. No. 55) and 1.156 (Well. No. 83) wt%. Absorption of hydrocarbon by rock matrix was also determined. The amount of absorption in Mish anticline is more than that of Gachsaran oil field. This is mostly due to the presence of argillaceous matrix in this area, but the clays have not been successful in absorbing organic matter; this is due to the result obtained from small amount of organic matter in the basin. The Rock-Eval data revealed that the sedimentary paleo-environment strongly affected the source potential of this formation as it changed from the continental and Deltaic in the Mish anticline to deeper marine in Gachsaran oil field. In addition, curves of Burial history were drawn for Gachsaran well No. 55, in order to assess the thermal maturity of the Pabdeh formation. The results of the methods indicated that Pabdeh formation in Gachsaran oil field had a good to very good hydrocarbon potential and had entered to oil window.
Highlights
Zagros zone is located in southwest of Iran and this zone is characterized by intense structural depression
The Rock-Eval data revealed that the sedimentary paleo-environment strongly affected the source potential of this formation as it changed from the continental and Deltaic in the Mish anticline to deeper marine in Gachsaran oil field
Burial history curves were drawn for well No 55, in order to assess the thermal maturity of the Pabdeh Formation in the Gachsaran oil field
Summary
Zagros zone is located in southwest of Iran and this zone is characterized by intense structural depression. This study is focused on evaluation of petroleum generation potential and thermal history of the Pabdeh Formation in Zagros area. Among all of these petroleum systems (i.e. Paleozoic, Early Jurassic, Mid Jurassic, Lower Cretaceous and Mid Cretaceous-Early Miocene petroleum systems), the Mid Cretaceous-Early Miocene is the most important one for oil generation in Iran [1]. In this study, which is based on both geochemical analyses and thermal history modeling, potential of Pabdeh Formation in Mish anticline and Gachsaran oil field is evaluated with regard to sedimentary Paleo environment during the Paleocene-Eocene (Figure 1). By contrast, limited papers are available on geochemical evaluations of this formation in Dezful embayment [3] [4] [5] [6] [7] and could be mentioned as examples
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
