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首页> 外文期刊>Fuel >Diamondoids as tracers of late gas charge in oil reservoirs: Example from the Tazhong area, Tarim Basin, China
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Diamondoids as tracers of late gas charge in oil reservoirs: Example from the Tazhong area, Tarim Basin, China

机译：类金刚石作为油藏晚期气藏的示踪剂：以塔里木盆地塔中地区为例

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Significant petroleum resources occur in the Ordovician carbonate reservoirs of the Tazhong area (Tarim Basin, China) in accumulations of black oil, volatile oil and condensate. However, the factors controlling the distribution of pools with different fluid phases remain poorly understood. Here, we integrate geological and conventional oil/gas geochemical data with an extensive dataset on diamondoids and propose a model for the occurrence of petroleum fluids in the area. Oils in the study area contain low variety and concentration of diamondoids and organic-sulfur compounds (OSCs) and have oil-dissolved wet gas mostly co-generated with oil. In contrast, liquids in the condensate reservoirs are significantly enriched in various types of diamondoids and OSCs, and have dry associated gas with methane enriched in C-13 and relatively high content of H2S. We interpret that mature gas from deeper Cambrian strata, likely generated from thermally cracked oils and affected by thermochemical sulfate reduction (TSR), invaded the condensate reservoirs. Black oil reservoirs did not receive this late gas charge and this preserved their oil phase. The 1D burial history models and data on fluid inclusions suggest that oil charged all studied Ordovician reservoirs in the Late Permian - Triassic time, while the late gas charge occurred in selected reservoirs in the Late Himalayan time (similar to 10 Ma). Diamondoids proved to be useful indicators of the late gas charge as their variety and concentrations in liquids from the study area show good correlation with the extent of gas invasion.
机译：塔中地区（中国塔里木盆地）的奥陶系碳酸盐岩油藏中蕴藏着大量的石油资源，其中蕴藏着黑油，挥发油和凝析油。但是，控制具有不同流体相的池分布的因素仍然知之甚少。在这里，我们将地质和常规石油/天然气地球化学数据与有关类金刚石的大量数据集进行了整合，并提出了该地区石油流体发生的模型。研究区域中的油类化合物含量低，类固醇和有机硫化合物（OSC）含量低，并且溶解有油的湿气主要与油共生。相反，凝析油藏中的液体显着富集了各种类型的类金刚石和OSC，并且具有与甲烷相关的干燥伴生气和富含C-13和相对较高含量的H2S。我们认为，来自较深寒武纪地层的成熟气体侵入了凝析油藏，这些气体可能是由热裂化油产生的，并且受热化学硫酸盐还原作用（TSR）的影响。黑油储层未接收到该晚期气体，因此保留了其油相。一维埋藏历史模型和流体包裹体的数据表明，在二叠纪-三叠纪晚期，所有已研究的奥陶纪油藏都充入了油，而在喜马拉雅晚期（类似于10 Ma），部分储集层中发生了晚期天然气充注。事实证明，类金刚石是晚期气体充注的有用指标，因为它们在研究区域的液体中的种类和浓度与气体入侵的程度显示出良好的相关性。

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