10,351
edits
Changes
Jump to navigation
Jump to search
Line 17:
Line 17: + + + − The figures below show carbon isotope ratios for fractions of six oils comprising two families from the Zagros orogenic belt. The “Galimov” plot (left) and the Sofer diagram (right) show the δ<sup>13</sup>C values. Oils 3 and 4 are from the Ahwaz field, whereas oils 13, 14, and 16 are from the northeastern Dezful area. The midrange position of oil 18 suggests that it could be a mixture of these two main oil types. These conclusions are also supported by molecular and elemental data.+ − − [[file:oiloil-and-oilsource-rock-correlations_fig8-3.png|thumb|{{figure number|8-3}}From Bordenave and Burwood;<ref name=ch08r2>Bordenave, M., L., Burwood, R., 1990, [[Source rock]] distribution and [[maturation]] in the Zagros orogenic belt: provenance of the Asmari and Bangestan reservoir oil accumulations: Organic Geochemistry, vol. 16, p. 369–387., 10., 1016/0146-6380(90)90055-5</ref> reprinted with permission from Elsevier.]]
Isotopic parameter data for oil–oil and oil–source rock correlations (view source)
Revision as of 17:47, 11 February 2014
, 17:47, 11 February 2014→Carbon isotope ratios
==Carbon isotope ratios==
==Carbon isotope ratios==
[[file:oiloil-and-oilsource-rock-correlations_fig8-3.png|thumb|{{figure number|1}}From Bordenave and Burwood;<ref name=ch08r2>Bordenave, M., L., Burwood, R., 1990, [[Source rock]] distribution and [[maturation]] in the Zagros orogenic belt: provenance of the Asmari and Bangestan reservoir oil accumulations: Organic Geochemistry, vol. 16, p. 369–387., 10., 1016/0146-6380(90)90055-5</ref> reprinted with permission from Elsevier.]]
Carbon isotope ratios are commonly measured on whole oils, kerogens, and whole extracts (bitumens) from rocks. In many cases they are also measured on the C<sub>15+</sub> saturate and aromatic fractions and are often displayed on a Sofer.<ref name=ch08r50>Sofer, Z., 1984, Stable carbon isotope compositions of crude oils: application to source depositional environments and petroleum alteration: AAPG Bulletin, vol. 68, p. 31–49.</ref> diagram (e.g., the figure on the right, below). Less commonly, carbon isotope ratios are measured on the distillate and/or chromatographic fractions. For oil-[[source rock]] correlations, isotope ratios can also be measured on kerogen. Results of isotope analyses are often presented in a socalled Galimov diagram (left, below). Carbon isotope ratios can be characteristic of geologic age and environment (e.g., <ref name=ch08r4>Chung, H., M., Rooney, M., A., Toon, M., B., Claypool, G., E., 1992, Carbon isotopic composition of marine crude oils: AAPG Bulletin, vol. 76, p. 1000–1007.</ref><ref name=ch08r5>Chung, H., M., Rooney, M., A., Toon, M., B., Claypool, G., E., Rooney, M., A., Squires, R., M., 1994, Source characteristics of marine oils as indicated by carbon isotopic ratios of volatile hydrocarbons: AAPG Bulletin, vol. 78, p. 396–408.</ref>
Carbon isotope ratios are commonly measured on whole oils, kerogens, and whole extracts (bitumens) from rocks. In many cases they are also measured on the C<sub>15+</sub> saturate and aromatic fractions and are often displayed on a Sofer.<ref name=ch08r50>Sofer, Z., 1984, Stable carbon isotope compositions of crude oils: application to source depositional environments and petroleum alteration: AAPG Bulletin, vol. 68, p. 31–49.</ref> diagram (e.g., the figure on the right, below). Less commonly, carbon isotope ratios are measured on the distillate and/or chromatographic fractions. For oil-[[source rock]] correlations, isotope ratios can also be measured on kerogen. Results of isotope analyses are often presented in a socalled Galimov diagram (left, below). Carbon isotope ratios can be characteristic of geologic age and environment (e.g., <ref name=ch08r4>Chung, H., M., Rooney, M., A., Toon, M., B., Claypool, G., E., 1992, Carbon isotopic composition of marine crude oils: AAPG Bulletin, vol. 76, p. 1000–1007.</ref><ref name=ch08r5>Chung, H., M., Rooney, M., A., Toon, M., B., Claypool, G., E., Rooney, M., A., Squires, R., M., 1994, Source characteristics of marine oils as indicated by carbon isotopic ratios of volatile hydrocarbons: AAPG Bulletin, vol. 78, p. 396–408.</ref>
[[:file:oiloil-and-oilsource-rock-correlations_fig8-3.png|Figure 1]] shows carbon isotope ratios for fractions of six oils comprising two families from the Zagros orogenic belt. The “Galimov” plot (left) and the Sofer diagram (right) show the δ<sup>13</sup>C values. Oils 3 and 4 are from the Ahwaz field, whereas oils 13, 14, and 16 are from the northeastern Dezful area. The midrange position of oil 18 suggests that it could be a mixture of these two main oil types. These conclusions are also supported by molecular and elemental data.
==Compound-specific isotope analysis==
==Compound-specific isotope analysis==