Changes

==Geological setting==

==Geological setting==

[[file:oiloil-and-oilsource-rock-correlations_fig8-48.png|thumb|300px|{{figure number|1}}Generalized west–east [[cross section]] from the Brazilian continental margin, with the coastline approximately at the western margin. From Mello et al.;<ref name=ch08r30>Mello, M. R., P. C. Gaglianone, S. C. Brassell, and J. R. Maxwell, 1988a, Geochemical and biological marker assessment of depositional environments using Brazilian offshore oils: Marine and Petroleum Geology, vol. 5, p. 205–223, DOI: 10.1016/0264-8172(88)90002-5.</ref> reprinted with permission from Marine and Petroleum Geology.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-48.png|thumb|300px|{{figure number|1}}Generalized west–east [[cross section]] from the Brazilian [[continental margin]], with the coastline approximately at the western margin. From Mello et al.;<ref name=ch08r30>Mello, M. R., P. C. Gaglianone, S. C. Brassell, and J. R. Maxwell, 1988a, Geochemical and biological marker assessment of depositional environments using Brazilian offshore oils: Marine and Petroleum Geology, vol. 5, p. 205–223, DOI: 10.1016/0264-8172(88)90002-5.</ref> reprinted with permission from Marine and Petroleum Geology.]]

The offshore margin of Brazil contains oil reserves in Cretaceous and lower [[Tertiary]] reservoirs within several large basins. These basins, the product of rifting of Africa from South America in the Early Cretaceous, contain several source units representing depositional settings ranging from lacustrine to deltaic to marine.

The [[Offshore exploration and exploitation|offshore]] margin of Brazil contains oil reserves in Cretaceous and lower [[Tertiary]] reservoirs within several large basins. These basins, the product of rifting of Africa from South America in the Early Cretaceous, contain several source units representing depositional settings ranging from lacustrine to deltaic to marine.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-48.png|Figure 1]] is a generalized west–east cross section from the Brazilian continental margin, with the coastline approximately at the western margin. Note the wide range of depositional settings, corresponding to the wide range of potential [[source rock]]s for the five source-distinctive groups of oils in these marginal basins.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-48.png|Figure 1]] is a generalized west–east cross section from the Brazilian continental margin, with the coastline approximately at the western margin. Note the wide range of depositional settings, corresponding to the wide range of potential [[source rock]]s for the five source-distinctive groups of oils in these marginal basins.

==What this case study illustrates==

==What this case study illustrates==

This case study demonstrates the utility of compound concentration data and emphasizes the use of routine oil–oil correlation data in predicting the depositional setting of oils. Later efforts have confirmed several of these predictions using similar correlation tools on prospective source rocks in the region.<ref name=ch08r31>Mello, M., R., Telnæs, N., Gaglianone, P., C., Chicarelli, M., I., Brassell, S., C., Maxwell, J., R., 1988b, Organic geochemical characterisation of depositional palaeoenvironments of source rocks and oils in Brazilian marginal basins: Organic Geochemistry, vol. 13, p. 31–45, DOI: 10.1016/0146-6380(88)90023-X.</ref> The resulting oil–source rock correlations are supported by a similarly wide range of analytical approaches.

This case study demonstrates the utility of compound concentration data and emphasizes the use of routine oil–oil correlation data in predicting the depositional setting of oils. Later efforts have confirmed several of these predictions using similar correlation tools on prospective source rocks in the region.<ref name=ch08r31>Mello, M. R., N. Telnæs, P. C. Gaglianone, M. I. Chicarelli, S. C. Brassell, and J. R. Maxwell, 1988b, Organic geochemical characterisation of depositional palaeoenvironments of source rocks and oils in Brazilian marginal basins: Organic Geochemistry, vol. 13, p. 31–45, DOI: 10.1016/0146-6380(88)90023-X.</ref> The resulting oil–source rock correlations are supported by a similarly wide range of analytical approaches.

==See also==

==See also==

[[Category:Critical elements of the petroleum system]]  

[[Category:Critical elements of the petroleum system]]  

[[Category:Oil–oil and oil–source rock correlations]]

[[Category:Oil–oil and oil–source rock correlations]]