Geochemical evaluation of source rocks in the Kilur Karim oilfield, Southwest of Iran
Subject Areas :Keywords: geochemical study kerogen maceral vitrinite reflectance burial history kilor karim oil field ,
Abstract :
Kilorkarim oilfield is located in 40 Km North of the Persian Gulf and in the vicinity of Siah Makan, Golkhari, Bibi Hakeemeh oilfields. The present study focuses on geochemical evaluation of probable source rocks in this oilfield. For this purpose, source rock samples that selected from three wells were evaluated using Rock-Eval pyrolysis and reconstruction of burial history modeling. The results show that organic matter of these source rocks are mostly a mixture of Kerogen types II and III. Also organic petrography study showed that Vitrinite, Detrovitrinite, Hominite and Fuzinite macerals in Pabdeh, Gurpi and Kazhdomi Formations, and reworked Bitumen in some sections of the Pabdeh Formation. Based on Vitrinite Reflectance measurments in well#1, Pabdeh and Gurpi Formations aren’t interred in oil window and Kazhdumi Formation interred in oil window. In well#2 Pabdeh and Gurpi Formations are in the beginning and in oil window, respectively. In well#4 Vitrinite Reflectance is emphasized the entrance of Kazhdumi Formation into oil window. Reconstruction of Burial history and thermal modeling was performed by PBM 1D software. Modeling showed that Pabdeh Formation in well #1 and 4a interred in oil window but the opposite is true for middle section of well #2. Because of more deposition of Aghajari Formation in the south part, oil window occurs in shallower depth and therefore the maturity is higher in the south toward north of the oilfield.