《Table 2δ13C (‰) , δD (‰) , δ15N andδ34S (‰) values in different components of the gas samples taken

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《"Assessing Lateral Continuity within the Yammama Reservoir in the Foroozan Oilfield, Offshore Iran: An Integrated Study"》

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The composition and isotopic signatures of the gas samples are given in Table 1.The concentration of methane，as the main constituent of the gas samples，was found to vary from 62-64%in the northwestern part to 75–77%in the southeastern part of the reservoir，indicating a clear lateral distinction.The contents of other gas components，such as ethane，propane and butane，also exhibited such a clear distinction.Based on the results，the average concentration of ethane over the samples taken from the northwestern part of the reservoir was 9.9%，while the corresponding concentration in the samples taken from the southeastern part of the reservoir was3.1%.The corresponding average concentrations for propane and butane were 2.3%and 1.04%，and 0.65%and0.39%，respectively.These clear differences in the gas composition suggest lateral heterogeneity across the reservoir.Non-hydrocarbon gases were found to consist mainly of carbon dioxide，hydrogen sulfide and nitrogen.Carbon dioxide and nitrogen concentrations showed no particular differences throughout the entire reservoir.Conversely，hydrogen sulfide concentration was found to increase as one moved from the north to the south of the reservoir（on average，from 0.68%in the north to 2.37%in the south），further emphasizing the lack of homogeneity throughout the Yammama Reservoir.Based on the petroleum engineering data，reservoir pressure was uniform across the Yammama Reservoir（3250 psi）.Therefore，being dependent on the reservoir pressure，the solubility of hydrocarbon gases and hydrogen sulfide in the oil were concluded to be constant throughout the reservoir.