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Charging of Elk Hills reservoirs as determined by oil geochemistry

机译：通过石油地球化学确定的麋鹿山储层装料

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摘要

Crude oils from Miocene and Pliocene reservoirs from the Elk Hills field in California's San Joaquin basin were analyzed for stable carbon isotopes and biomarkers. Cluster analysis of geochemical variables defines five principal oil families, all derived from different organic-rich facies of the Miocene Monterey Formation. Carbon isotope analysis indicates no contribution from the basin's other major source rock, the Eocene Kreyenhagen Formation. Oil families show a strong correspondence to stratigraphic intervals. Oils from pre-Monterey reservoirs were probably generated from the lowermost organic-rich facies of the Monterey and are the most thermally mature. Upper Miocene Stevens zone turbidite reservoirs contain oils of various thermal-maturity stages, but mature light ends are abundant and are likely generated from the floors of the adjacent subbasins located north and south of Elk Hills. The relatively minor presence of low-thermal-maturity biomarkers that are typically characteristic of Monterey oils may indicate that Stevens traps did not form until after the source intervals were at a higher level of thermal maturity. All oils in Stevens porcelanite reservoirs contain a higher concentration of low-maturity biomarkers, which may indicate derivation from more localized areas on the flanks of the Elk Hills anticlines. The shallow Pliocene oils have suffered biodegradation to different degrees, and the lowest API gravities occur on the flanks of the anticline. The carbon isotopic composition of these oils suggests yet another Monterey source facies that charged the Pliocene reservoirs and is not simply the result of vertical leakage from the older Miocene reservoirs.
机译：分析了加利福尼亚圣华金盆地Elk Hills油田中新世和上新世储层的原油中的稳定碳同位素和生物标志物。地球化学变量的聚类分析 定义了五个主要的油族， 全部来自中新世 Monterey组的富含有机质的不同相。碳同位素分析表明，该盆地的其他主要烃源岩始新世Kreyenhagen 地层没有贡献。石油家族与地层 区间显示出强烈的对应关系。蒙特雷前储集层中的油可能是 来自蒙特里最低有机富集相，并且是最热成熟的。中新世史蒂文斯地区上层浊积岩 储层中含有各种热成熟期的油， 但成熟的轻质油层丰富，很可能从相邻的子盆地位于麋鹿山的北部和 南部。蒙特雷油 的典型特征是相对较低的低热成熟度 生物标志物的存在可能表明，直到 之后才形成史蒂文斯陷阱。源间隔处于较高的热成熟度水平。 史蒂文斯斜云母储层中的所有油都具有较高的低成熟度生物标志物浓度，这可能表明 源自麋鹿 Hills背斜侧面的较局部区域。上新世浅层油经历了不同程度的生物降解，并且API重力最低，发生在背斜的侧面。这些油的碳同位素组成 暗示了另一种蒙特雷源相使 带给了上新世储层，而不仅仅是由于该油层垂直泄漏的结果 。较老的中新世储层。

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  • 来源
    《AAPG Bulletin》 |2005年第10期|00001347-00001371|共25页
  • 作者

    John E. Zumberge; Judy A. Russell; Stephen A. Reid;

  • 作者单位

    GeoMark Research, Ltd., 9748 Whithorn Drive, Houston, Texas 77095jzumberge@geomarkresearch.com;

    Occidental Oil and Gas Corporation, Suite 110, 5 Greenway Plaza, Houston, Texas 77046judy_russell@oxy.com;

    Occidental Oil and Gas Corporation, Suite 110, 5 Greenway Plaza, Houston, Texas 77046tony_reid@oxy.com;

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