Organic geochemistry of continental margin sediments

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Well cuttings from two offshore Gulf Coast stratigraphic test wells (South Padre and Mustang Island) have been analyzed for C/sub 7/-C/sub 15/ hydrocarbon distributions by thermal distillation-pyrolysis GC, for C/sub 1/-C/sub 7/ hydrocarbons by headspace analysis and for C/sub 15//sup +/ hydrocarbons by extraction. The results from the South Padre well show that the threshold of intensive hydrocarbon generation starts around 10,000 feet and peaks around 14,000 feet. The distribution of individual homologs within each hydrocarbon group indicates that the more volatile members are migrating upward from the generation zone. Thus, n-pentane (C/sub 5/) peaks at 10,000 feet, and the ... continued below

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Pages: 65

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Hunt, J.M.; Whelan, J.K.; Huc, A.Y. & Pratt, M. January 1, 1979.

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Well cuttings from two offshore Gulf Coast stratigraphic test wells (South Padre and Mustang Island) have been analyzed for C/sub 7/-C/sub 15/ hydrocarbon distributions by thermal distillation-pyrolysis GC, for C/sub 1/-C/sub 7/ hydrocarbons by headspace analysis and for C/sub 15//sup +/ hydrocarbons by extraction. The results from the South Padre well show that the threshold of intensive hydrocarbon generation starts around 10,000 feet and peaks around 14,000 feet. The distribution of individual homologs within each hydrocarbon group indicates that the more volatile members are migrating upward from the generation zone. Thus, n-pentane (C/sub 5/) peaks at 10,000 feet, and the higher homologs, C/sub 5/, C/sub 6/, C/sub 7/, C/sub 8/ and C/sub 10/ peak at successively greater depths to 15,000 feet. Benzene also peaks before toluene which peaks before the xylenes. This phenomena was not observed in the Mustang Island well where organic carbon contents and hydrocarbon yields were lower, apparently too low to induce migration. C/sub 1/-C/sub 7/ hydrocarbon distributions also were studied by the headspace technique in offshore samples from the East Coast, Gulf of California and Gulf of Maine. Hydrocarbon yields from wells east of Cape Hatteras and on the Blake-Bahama Plateau were much lower than in most other areas analyzed to date. Some Gulf of California samples had high gas yields due to hydrothermal intrusions and igneous dikes raising sediment temperatures. Gulf of Maine samples were unique in having no aromatic hydrocarbons.

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Pages: 65

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Dep. NTIS, PC A04/MF A01.

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  • Report No.: COO-4392-2
  • Grant Number: EG-77-S-02-4392
  • DOI: 10.2172/5781505 | External Link
  • Office of Scientific & Technical Information Report Number: 5781505
  • Archival Resource Key: ark:/67531/metadc1097746

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  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • March 20, 2018, 8:07 p.m.

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Hunt, J.M.; Whelan, J.K.; Huc, A.Y. & Pratt, M. Organic geochemistry of continental margin sediments, report, January 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1097746/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.