Geochemical investigation of gas condensate from South Pars field in Persian Gulf, Iran.
Subject Areas :Mahmud Memariani 1 , Roya khezrlo 2 , Hadi kermanshahi 3
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Keywords: Condensate Oil topping Urea adduction South Pars,
Abstract :
In this study, in order to determine the geochemical properties of condensates from South Pars Field, 4 samples from Kangan (Early Triassic) and Dalan (Middle- Late Permian) reservoir were subjected to geochemical analyses. Concentration and Identification of biomarkers and their fingerprint were achieved by successive treatments of condensate samples. These analyses were; i) Mild evaporation of light hydrocarbons, ii) Mild oil topping of samples and iii) Urea adduction. Based on different biomarkers fingerprints, the accumulated condensates were generated from a carbonate-clastic source rock containing organic matters with mainly kerogen type II and little terrestrial inputs, with marine origin, which has been deposited in anoxic conditions. Maturity of condensate indicates, hydrocarbon generation from a source rock with late oil window and early gas generation stage. Further investigations revealed that, gas and condensates were originated from highly reach organic matter, Silurian shales (Sarchahan Formation) deposited in the Fars and offshore of Persian Gulf region.