Structure, Rock Types, and Reservoir Properties of Altered Permian–Triassic Rhyodacites in Grabens of the Frolov Megadepression in Western Siberia

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
M. E. Smirnova, I. V. Panchenko, P. Y. Kulikov, A. V. Latyshev, A. I. Tokmakova, J. I. Trushkova, E. E. Sapogova, A. A. Bakulin, V. D. Shmakov
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Abstract

This article presents results of the comprehensive study (composition, reservoir properties, geophysical parameters, and age) of altered felsic volcanic rocks (rhyolites, dacites) associated with the Permian-Triassic intermediate structural level of the West Siberian. As a result of secondary alteration, oil and gas reservoirs can form in these volcanic rocks. Taking into account their occurrence depth (more than 2 km), they are available for study only from core and geophysical data. Based on the results of core studies, 25 petrographic varieties of felsic volcanics were established. The combination of such features as 1) structural and textural features, 2) degree of secondary alteration, and 3) peculiarities of logging curves made it possible to group these numerous petrographic varieties into six key rock types. At the same time, the distinguished rock types are characterized by different reservoir properties (porosity, permeability). All 443 samples representing various rock types are characterized by similar geochemical composition, and the U-Pb ages obtained by the zircons (254 ± 2–248.2 ± 1.3 Ma) indicate that the studied felsic volcanics belong to a single tectonic-magmatic stage at the Permian-Triassic boundary. According to seismic data, it was revealed that within the Frolov megadepression (the central part of Western Siberia), the studied volcanic rocks are distributed within grabens. In particular, the boundaries of a relatively large (70 km wide and 200 km long) graben-like Rogozhnikov-Nazym structure were adjusted, and several similar, but smaller structures were identified. A comprehensive analysis of core, log and seismic data made it possible to determine the morphology and spatial relationships of volcanic bodies composed of various types of felsic volcanic rocks, providing the basis for predicting intervals of the section with the best reservoir properties.

Abstract Image

西西伯利亚西部弗罗洛夫大凹陷地块中二叠纪-三叠纪变质流纹岩的结构、岩石类型和储层性质
摘要 本文介绍了对与西西伯利亚二叠纪-三叠纪中间构造层有关的蚀变长粒岩火山岩(流纹岩、大理岩)的综合研究结果(成分、储层性质、地球物理参数和年龄)。由于二次蚀变作用,这些火山岩中可能形成油气藏。考虑到其埋藏深度(超过 2 千米),只能通过岩芯和地球物理数据对其进行研究。根据岩芯研究的结果,确定了长岩火山岩的 25 个岩相类型。结合 1) 结构和纹理特征、2) 次生蚀变程度、3) 测井曲线的特殊性等特征,可以将这些众多岩相种类归纳为六种主要岩石类型。同时,这些不同的岩石类型具有不同的储层属性(孔隙度、渗透率)。代表各种岩石类型的 443 个样本都具有相似的地球化学成分,锆石获得的 U-Pb 年龄(254 ± 2-248.2 ± 1.3 Ma)表明,所研究的长石火山岩属于二叠纪-三叠纪边界的单一构造-岩浆阶段。地震数据显示,在弗罗洛夫大凹陷(西西伯利亚中部)内,所研究的火山岩分布在地堑内。特别是,对一个相对较大(宽 70 千米,长 200 千米)的类似罗戈日尼科夫-纳日姆地堑结构的边界进行了调整,并确定了几个类似但较小的结构。通过对岩心、测井和地震数据的综合分析,确定了由各种类型的长石火山岩组成的火山岩体的形态和空间关系,为预测具有最佳储层特性的区段提供了依据。
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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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