Changes

==Multiple sources for oil in a trap==

==Multiple sources for oil in a trap==

Many sedimentary basins contain more than one oil source unit. If two or more [[source rocks]] are thermally mature, oils from both may become commingled within a single trap, preventing straightforward oil–source rock correlations. A good example is found in Seifert et al..<ref name=ch08r49>Seifert, W., K., Moldowan, J., M., Jones, R., W., 1979, Application of biological marker chemistry to petroleum exploration, in Proceedings of the Tenth World Petroleum Congress: London, Heyden & Son, p. 425–440.</ref>

Many sedimentary basins contain more than one oil source unit. If two or more [[source rocks]] are thermally mature, oils from both may become commingled within a single trap, preventing straightforward oil–source rock correlations. A good example is found in Seifert et al.<ref name=ch08r49>Seifert, W. K., J. M. Moldowan, and R. W. Jones, 1979, Application of biological marker chemistry to petroleum exploration, in Proceedings of the Tenth World Petroleum Congress: London, Heyden & Son, p. 425–440.</ref>

==Lack of distinguishing characteristics==

==Lack of distinguishing characteristics==