The Woodford–Mississippian “Commingled Production” is a prolific unconventional hydrocarbon play in Oklahoma, USA. The tight reservoirs feature variations in produced fluid chemistry usually explained by different possible source rocks. Such chemical variations are regularly obtained from bulk, molecular, and isotopic characteristics. In this study, we present a new geochemical investigation of gasoline range hydrocarbons, biomarkers, and diamondoids in oils from Mississippian carbonate and Woodford Shale. A set of oil/condensate samples were examined using high-performance gas chromatography and mass spectrometry. The result of the condensates from the Anadarko Basin shows a distinct geochemical fingerprint reflected in light hydrocarbon characterized by heptane star diagrams, convinced by biomarker characteristics and diamantane isomeric distributions. Two possible source rocks were identified, the Woodford Shale and Mississippian mudrocks, with a variable degree of mixing. Thermal maturity based on light hydrocarbon parameters indicates that condensates from the Anadarko Basin are of the highest maturity, followed by “Old” Woodford-sourced oils and central Oklahoma tight oils. These geochemical parameters shed light on petroleum migration within Devonian–Mississippian petroleum systems and mitigate geological risk in exploring and developing petroleum reservoirs.

中文翻译：

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轻烃地球化学：深入了解美国俄克拉荷马州中部伍德福德-密西西比致密油区的油/凝析物族和推断的烃源岩

伍德福德-密西西比州的“混合生产”是美国俄克拉荷马州一个多产的非常规油气田。致密储层的特征是采出流体化学成分的变化，通常用不同的可能烃源岩来解释。这些化学变化通常是根据体积，分子和同位素特征获得的。在这项研究中，我们提出了对密西西比州碳酸盐岩和伍德福德页岩油中的汽油范围碳氢化合物，生物标志物和类金刚石的新地球化学研究。使用高性能气相色谱和质谱法检查了一组油/凝析油样品。来自阿纳达科盆地的凝析水的结果表明，在以庚烷星图为特征的轻质烃中反射出独特的地球化学指纹，被生物标记物特征和金刚烷异构体分布所证实。确定了两种可能的烃源岩，伍德福德页岩和密西西比泥岩，具有不同的混合度。基于轻质烃参数的热成熟度表明，来自阿纳达科盆地的凝析油的成熟度最高，其次是伍德福德产的“老”油和俄克拉荷马州中部的致密油。这些地球化学参数揭示了泥盆纪-密西西比石油系统内的石油运移，并减轻了勘探和开发石油储层的地质风险。基于轻质烃参数的热成熟度表明，来自阿纳达科盆地的凝析油的成熟度最高，其次是伍德福德产的“老”油和俄克拉荷马州中部的致密油。这些地球化学参数揭示了泥盆纪-密西西比石油系统内的石油运移，并减轻了勘探和开发石油储层的地质风险。基于轻质烃参数的热成熟度表明，来自阿纳达科盆地的凝析油的成熟度最高，其次是伍德福德产的“老”油和俄克拉荷马州中部的致密油。这些地球化学参数揭示了泥盆纪-密西西比石油系统内的石油运移，并减轻了勘探和开发石油储层的地质风险。