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Relationships of Oil Composition and Stratigraphy of Delaware Reservoirs
This report is based on 22 crude oil samples from the Delaware Mountain Group and Ochoa Series of the Permian in the Delaware basin. The Delaware Mountain oils can be subdivided into three groups based on naphthenes and paraffins. Three of the four oils from the Ochoa beds are classed in a fourth group. The isotopic composition of all of the oils is quite constant. The oil field waters increase in salinity from west to east.
There appears to be little, if any, interaction between the oil and water to change the character of either fluid unless the Ochoa Series oils could have lost their naphtha content by solution by water. There is only a questionable correlation between the various groups of oil and water, and structural and stratigraphic trap fields. In general, the API gravity increases westward and suggests a migration of the lighter fraction to the west. There appears to be no correlation between the groups of Delaware oils and the southwest-northeast Delaware sandstone productive trends. The data are not conclusive enough to determine whether the Ochoa, Castile oils at Rustler Hills field were formed from a source other than the Delaware Mountain oils, or whether they originated within the Delaware Mountain Group and migrated into the Castile Formation.
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