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首页> 外文期刊>Russian Geology and Geophysics >Lithologic, Geochemical and Geophysical Characteristics of the Boundary Strata of the Bazhenov and Kulomza Horizons (Lower Cretaceous Base) in the Central Regions of the West Siberia
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Lithologic, Geochemical and Geophysical Characteristics of the Boundary Strata of the Bazhenov and Kulomza Horizons (Lower Cretaceous Base) in the Central Regions of the West Siberia

机译：西西伯利亚中央地区Bazhenov和Kulomza视野（下白垩纪基地）边界地层的岩性，地球化学和地球物理特征

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摘要

The gradual transition of the Bazhenov Formation top into the overlying deposits makes it difficult to establish its upper boundary. The problem is aggravated by the lack of core material when the formation is recognized according to the results of geophysical well studies. A comprehensive analysis of geochemical and lithological data and the results of geophysical well surveys enabled us not only to detennine the specific structure of the transitional zone from the Bazhenov Formation top to the rocks of the sub-Achimov member, but also to propose the criteria for delineating the upper boundary in the central regions of the West Siberian sedimentary basin within the Khentei hemianteclise, the South Nadym megamonoclise and the Mansi syneclise. Four members are distinguished in the transitional zone of the studied well sections (from bottom to top), which differ in lithological, geochemical and geophysical characteristics: (I) the "coccolithic" upper part of the Bazhenov Formation; (II) transitional member from the upper part of the Bazhenov Formation to the bottom of the sub-Achimov member; (III) transitional member from the bottom of the sub-Achimov member to its lower part; and (IV) the lower part of the sub-Achimov member. Member II is virtually not distinguished within the Khentei hemianteclise and the South Nadym megamonoclise. Member III contains the boundary between zones with different redox conditions. In case member II is distinguished, the upper boundary of the Bazhenov Formation corresponds to its top. To recognize the Bazhenov Formation top, it is necessary to use the integrated analysis results of the lithological and geochemical studies of the well core, and logging data (gamma-ray logging, neutron gamma-ray logging and its variations, lateral logging, and induction logging) when focusing attention mainly on radioactivity.
机译：Bazhenov地层顶部进入覆盖沉积物的逐渐过渡使得难以建立其上边界。当根据地球物理井研究的结果认识到形成时，缺乏核心材料的问题会加剧。对地球化学和岩性数据的综合分析以及地球物理井调查的结果使我们不仅可以将过渡区的特定结构从Bazhenov地层顶部确定到亚achimov成员的岩石中，而且还提出了标准描绘西伯利亚沉积物盆中中央地区的上边界，南纳·梅戈莫纳蒙和曼西同步。四个成员在学习的井部分（从底部到顶部）的过渡区中区分，这在岩性，地球化学和地球物理特征中不同：（i）Bazhenov形成的“Coccolitic”上部; （ii）从Bazhenov的上半部分形成的过渡构件到亚achimov成员的底部; （iii）从亚acimov成员的底部到其下部的过渡构件; （iv）亚acimov成员的下部。成员II实际上没有区别于Khentei HemianteClise和南纳德姆巨大的魅力。成员III包含具有不同氧化还原条件的区域之间的边界。在区分成员II的情况下，Bazhenov形成的上边界对应于其顶部。要识别Bazhenov形成顶部，有必要使用井核心岩性和地球化学研究的综合分析结果，以及测井数据（Gamma射线测井，中子伽马射线测井及其变化，横向测井和诱导在主要关注放射性时，记录）。

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