Abstract
Many oil and gas-bearing strata in sedimentary basins world-wide contain pore waters that have salinities far in excess of the waters originally deposited with these strata. The presence of these saline waters places important constraints on the modeling of subsurface fluid migration. Spatial variations in the salinity of pore fluids have the potential capacity for both driving fluid flow and for serving as tracers of past and present pathways of fluid flow and solute transport. Models of fluid migration which are not able to account for the observed salinity variations in a sedimentary basin may yield an incomplete or even erroneous interpretation of the past, present, and future migration of subsurface fluids in the basin.
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