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Charging of Paleozoic Reservoirs at Ghawar Field: Constraints from Gas Chemistry and Carbon Isotope Ratios

P. Jenden1 and M.A. Rowaie1

1Saudi Aramco


Large reserves of natural gas and condensate liquids are found in Khuff, Unayzah and Jauf reservoirs on the Ghawar high. We have investigated their origins using chemical and stable carbon isotope measurements for 200 samples analyzed over the last 15 years. Carbon dioxide concentrations are generally low but nitrogen reaches 15 % and hydrogen sulfide in the Khuff may exceed 15 %. Methane carbon isotope ratios range from -48 to -38 ‰ and the C2+ hydrocarbons vary from -36 to -23 ‰.


AAPG Search and Discovery Article #90188 ©GEO-2014, 11th Middle East Geosciences Conference and Exhibition, 10-12 March 2014, Manama, Bahrain