The main controls on petroleum accumulations in sedimentary basins include source-rock distribution, thermal maturity, migration pathways, and structural and stratigraphic traps. Whereas shale plays and conventional reservoirs are end members governed by contrasted geological processes, unconventional hybrid systems represent a continuum between them and share common characteristics with both. The Montney Formation provides a well-documented example of such a play, in which petroleum distribution is controlled by a combination of downdip increase of thermal maturity, fluid migration influenced by lateral and vertical permeability variations, and pressure compartmentalization. In this paper, we integrate publicly available data from thousands of wells within a well-defined stratigraphic framework to illustrate these regional and local controls on petroleum distribution in the Montney hybrid play. We demonstrate that produced gas compositional mapping is a powerful tool that complements comparatively sparse data from core- or cuttings-based organic geochemistry and petrography methods to provide an unparalleled level of detail of petroleum distribution at various scales. Coupling this compositional mapping with reservoir pressure data and published faults reveals a strong control of the structural framework on petroleum migration routes. The main targets of horizontal drilling in the Montney play are carrier beds that were charged by updip migrating petroleum and experienced further thermal maturation during the burial history. The relative contribution of different source rocks to this petroleum system remains speculative, and further investigation is needed to solve this conundrum.

中文翻译：

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Montney 混合油藏中的石油分布：源、载体床和结构控制

沉积盆地油气成藏的主要控制因素包括烃源岩分布、热成熟度、运移途径、构造和地层圈闭。虽然页岩油藏和常规储层是受对比地质过程控制的末端成员，但非常规混合系统代表了它们之间的连续体，并具有两者的共同特征。Montney 地层提供了这样一个有据可查的例子，其中石油分布受热成熟度的下倾增加、受横向和纵向渗透率变化影响的流体运移以及压力分区的组合控制。在这篇论文中，我们将来自数千口井的公开可用数据整合到一个明确定义的地层框架内，以说明这些区域和地方对 Montney 混合区石油分布的控制。我们证明，产出的气体成分图是一种强大的工具，可以补充来自基于岩心或岩屑的有机地球化学和岩石学方法中相对稀疏的数据，以提供各种尺度上无与伦比的石油分布详细信息。将此成分图与储层压力数据和已发布的断层相结合，揭示了对石油运移路线结构框架的强大控制。Montney 油气藏水平钻井的主要目标是承载层，这些层被上倾迁移的石油充填，并在埋藏历史中经历了进一步的热成熟。