Abstract

Unique material pertaining to the hydrodynamics of petroliferous rocks in the Yamal–Kara Depression has been summarized for the first time in the last 30 years. The region is distinguished by a wide development of anomalous high formation pressure (C_a up to 2.21) in both Jurassic and Lower Cretaceous rocks. Results of the study of filtration-capacity properties and hydrodynamic characteristics of reservoir rocks in the Jurassic–Cretaceous section suggest a dominant role of the elisional water exchange in the formation of modern structure of the hydrodynamic field. Elisional lithostatic system located at a depth of about 2–2.5 km begins to acquire features of elisional thermodehydration. At the current development stage of the basinal aquifer system, spacious piezomaximum zones (Bol’shaya Kheta and Kara megasyneclises) became internal water load (supply) zones with the maximal hydrogeological closedness in the Earth’s interior. Piezominimum zones extending along the main centers of oil-and-gas generation match the largest oil-and-gas fields (Vankor–Suzun, Bovanenkovo, Urengoi, and others). At present, we can define in the study region two types of natural aquifer systems: (i) elisional type prevailing in the internal sectors (e.g., Yamal–Kara Depression); (ii) infiltrational type prevailing in the external (marginal) sectors (West Siberian sedimentary basin).

中文翻译：

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选择性水交换在Yamal-Kara凹陷水动力场形成中的作用

摘要

在过去30年中，首次总结了有关亚马尔-卡拉凹陷中含油岩石流体动力学的独特材料。该地区以异常高地层压力（C _a侏罗纪和下白垩纪岩石中最高可达2.21）。侏罗纪-白垩纪剖面储层岩石的过滤能力和水动力特性的研究结果表明，电交换在水动力场现代结构形成中起着主导作用。位于约2–2.5 km深度的电碎石静压系统开始获得电热脱水的特征。在盆地含水层系统的当前开发阶段，宽敞的压电最大区域（Bol'shaya Kheta和Kara megasyneclises）成为内部水负荷（供应）区域，地球内部水文地质封闭度最大。沿着油气产生的主要中心延伸的压电最小区域与最大的油气田相匹配（Vankor–Suzun，Bovanenkovo，Urengoi等）。目前，我们可以在研究区域中定义两种类型的天然含水层系统：（i）内部部门普遍存在的选层型（例如，Yamal–Kara凹陷）；（ii）外部（边缘）部门（西西伯利亚沉积盆地）中普遍存在的渗透类型。