Abstract
The Dezful embayment located in southwest of Iran is one of the most potential areas for exploration and development of hydrocarbon reservoirs in the world. There are several source rock units with different geological ages. In this research, the Fahliyan and Surmeh reservoirs from the Garangan and Chilingar Dezful oilfields were studied using geochemical techniques including gas chromatography and carbon and sulfur stable isotope measurements. Carbon preference index of both reservoir oils was around one, indicating mature oil samples. The collected oil from both the fields was paraffinic in nature. Pr/nC17 and Ph/nC18 sand ratio and the plot of δ¹³C (arom) versus δ¹³C (sat), both indicated that a marine reducing environment prevailed during the deposition of their progenitor source rock. The organic matter deposited in this sediment is of kerogen type II (algal). Plot of stable carbon isotope values versus Pr/Ph ratio indicates that both oils originated from the same shaly limestone belonging to Mesozoic. The results of isotopic and geochemical studies show that a single source rock contributed to the oil family found in both fields.
Highlights
The southwest of Iran constitutes one of the most prolific hydrocarbon producing habitats (Bordenave and Burwood 1990) with cumulative recoverable of 136 billion(1011)barrels of oils including recent discoveries in the Kushk and Hosseinieh fields of Khuzestan province and 940 trillion(1012) cubic feet of associated and non-associated gas (James and Wynd 1965)
Stable carbon isotope ratios were determined on whole oil and oil fractions using EA-Isotope ratio mass spectrometry (IRMS) (Elemental Analyzer Isotope Ratio Mass Spectrometry) in Iso-Analytical laboratories
Detailed geochemical investigations on oil samples from Fahliyan and Surmeh formations indicated that these two show close similarities in terms of unique gas chromatogram and carbon isotope signatures
Summary
The southwest of Iran constitutes one of the most prolific hydrocarbon producing habitats (Bordenave and Burwood 1990) with cumulative recoverable of 136 billion(1011)barrels of oils including recent discoveries in the Kushk and Hosseinieh fields of Khuzestan province and 940 trillion(1012) cubic feet of associated and non-associated gas (James and Wynd 1965). The geology of this area is well defined (Jackson et al 1981; Furst 1990; Sepehr and Cosgrove 2004; Less 1940), considerable uncertainty exists as to the origin of these hydrocarbons. This story of geochemical investigation in Iran goes back to the years 1932–1941, when Less (1940) fractionated some crude oil as well as bitumen in the Fars area. It was conducted to determine the characters of source rock and extent of their distribution They correlated the oils with probable source rocks and with tectonics of the Fars, Khuzestan and Lurestan regions
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