Biomarker characteristics of oils from Garmian Oil Fields and potential Jurassic source rocks, Kurdistan,NE Iraq: implications for oil–oil and oil-source rocks correlation.

Diyar A. Saeed and Ibrahim M.J. Mohialdeen
Kurdistan Institution for Strategic Study and Scientific Research
Department of Geology, School of Science, University of Sulaimani, Kurdistan


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.

Key Words:
oil-source correlation


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