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首页> 外文期刊>AAPG Bulletin >Geochemical characteristics of oil and source rocks and implications for petroleum systems, Talara basin, northwest Peru
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Geochemical characteristics of oil and source rocks and implications for petroleum systems, Talara basin, northwest Peru

机译：秘鲁西北塔拉拉盆地石油和烃源岩的地球化学特征及其对石油系统的影响

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摘要

In the first comprehensive study of the Talara basin petroleum system of onshore and offshore northwest Peru, we test oil–source rock correlation through molecular biomarker analysis of oil samples from wells scattered throughout the basin, as well as purported source rocks. The new data presented in this manuscript suggest that the oils constitute one oil family, and that the source rock was a predominant marine clay deposited in an oxic to suboxic environment. Substantial relative amounts of oleanane in each oil sample indicate a notable input of terrestrial organic matter deposited in a mixed marine and terrestrial environment (probably deltaic). The high ratio of 24-norcholestanes to 27-norcholestanes and C25 highly branched isoprenoid (HBI) alkanes suggests a significant upwelling component in the source rock depositional environment. In addition, the high oleanane indices (oleanane/hopane) of the oils are not paralleled in any alternative source rock candidate in this study. The values are as expected for Tertiary source rocks and are at levels that exceed any reported Cretaceous or older source rock or oil. This result, in concert with high nordiacholestane ratios, norcholestane ratios, and HBI concentrations, indicates a Tertiary age source rock.
机译：在对秘鲁西北部陆上和近海塔拉拉盆地石油 系统的首次全面研究中，我们通过对石油的分子生物标记分析，测试了油源 岩石的相关性从遍布整个盆地的井中取样，以及 声称的烃源岩。 中提出的新数据建议这些油构成一个油族，并且 烃源岩是沉积在有氧 进入低氧环境。每个油样中的齐墩果烷 相当大，表明在混合的海洋和陆地环境 （可能是三角洲）中沉积了明显的陆地有机物 。 24-去甲胆甾烷与27-去甲胆甾烷 和C 25 高支化类异戊二烯（HBI）烷烃的比例很高，表明来源中存在 显着上升成分岩石沉积 环境。此外，在这项研究中，任何其他可替代烃源岩 中都没有平行油的高leananane指数（油烷/庚烷） 。该值与第三纪烃源岩的预期值相同，并且其水平超过任何报道的白垩纪烃源岩或较旧的烃源岩或石油。该结果与高 去甲胆甾烷比例，降胆固醇甾烷比例和HBI浓度相一致， 表示第三纪年龄烃源岩。

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    《AAPG Bulletin》 |2005年第11期|00001519-00001545|共27页
  • 作者

    Andrea Fildani; Andrew D. Hanson; Zhengzheng Chen; J. Michael Moldowan; Stephan A. Graham; Pedro Raul Arriola;

  • 作者单位

    Department of Geological and Environmental Sciences, Stanford University, Stanford, Californiapresent address: Chevron Energy Technology Company, 6001 Bollinger Canyon Rd., San Ramon, California 94583AndreaFildani@chevrontexaco.com;

    Department of Geoscience, University of Nevada Las Vegas, 4505 South Maryland Parkway, Las Vegas, Nevada 89154-4010andrewh@unlv.nevada.edu;

    Department of Geological and Environmental Sciences, Stanford University, Stanford, Californiapresent address: ConocoPhillips, 600 N. Dairy Ashford, Permian 3024, Houston, Texas, 77079zhengc@conocophillips.com;

    Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305moldowan@pangea.stanford.edu;

    Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305graham@pangea.stanford.edu;

    Petrobras Energia S.A., Amador Merino Reyna 285 5t° piso San Isidro, PeruParriola@petrobrasenergia.com;

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