Natural gas association with water and oil as depicted by atmospheric noble gases: case studies from the southeastern Mediterranean Coastal Plain

Details Natural gas association with water and oil as depicted by atmospheric noble gases: case studies from the southeastern Mediterranean Coastal Plain Natural gas association with water and oil as depicted by atmospheric noble gases: case studies from the southeastern Mediterranean Coastal Plain

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..87..338b&link_type=abstract

Earth and Planetary Science Letters, Volume 87, Issue 3, p. 338-346.

Mathematics

Logic

12

Scientific paper

A model for the equilibrium distribution of atmospheric noble gases (ANG) between natural gas and water phases was extended to include the gas-oil relationship. The basic assumption is that the ANG are introduced into hydrocarbon systems via recharge or seawater. Theoretical ANG patterns of natural gas, at equilibrium with water, fall between the air pattern and that of air-saturated water. Theoretical ANG patterns of natural gas degassed from oil (which had previously equilibrated with a water phase) cover a wide range, including the range calculated for gas-water equilibration. ANG patterns in natural gas which fall outside the overlapping range may, thus, indicate association of the gas with oil.
The model was tested in the case of hydrocarbon systems of the southeastern Mediterranean Coastal Plain. Other geochemical evidence indicates that the Ashdod-Sadot shallow gas wells are not related to oil. The relative ANG abundances in gas samples from these wells lie within the range predicted for gas-water association. The relative ANG abundances in samples degassed from oils of the Helez-Kokhav oilfield are similar to specific patterns predicted for the degassing of oil which was previously associated with water. Published and new analyses of methane-dominated natural gas samples from California, Japan and northern Israel also reveal ANG patterns of the type predicted by the model.
The results of the case studies support our hypothesis that water is responsible for transport of atmospheric noble gases into subsurface hydrocarbon systems. This forms the basis for identification of oil-associated natural gases via ANG study.
Incumbent of the Frank W. Considine Professorial Chair in Hydrological Research.

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