Abstract
The Middle Jurassic Sargelu Formation in Sangaw North -1 (SwN-1) borehole, Sangaw
 North Block, Garmian area, Kurdistan region, was used for geochemical analyses. Two
 crude oils from PLK-8 and Sarqala-1 wells in Pulkhana and Sarqala oil fields, one
 condensate from KM-3 well in Kor Mor gas field and seepage oil from ChiaSurkh oil
 field were chosen for organic geochemistry investigation, oil-oil and oil-source rocks
 correlation. Tectonically, the study area is located in the southeastern part of the Foothill
 Zone in Zagros Fold Belt. The biomarkers ratios and molecular compound distributions 
 showed that the oils, condensate and rock extracted sample of Sargelu Formation were derived
 from marine carbonate source rocks bearing marine algae and kerogen type II that deposited under
 reducing condition. Low presence of gammacerane indicated normal salinity condition
 during the depositions. The GC-FID traces of oils and condensate showed lack of any
 remarkable biodegradation, but rock-extracted of Sargelu Formations is strongly
 contaminated by polyethylene glycol according to the GC-FID chromatogram.
 Compositional similarity of sterane, hopane, isopernoid and n-alkane compounds among
 the crude oils and crude oils with extracted sample of Sargelu Formation suggested that
 the oils might be sourced from the same or similar source rocks that deposited under
 similar conditions. On the other hand, Sargelu Formation is supposed to be one of the
 sources of the generated crude oils. However, the maturity-related parameters showed no
 similarity between the crude oils and extracted sample of Sargelu Formation.
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