A Сomparative Analysis of Oils from Carbonate Sediments of the Upper Usolskaya Subformation and the Vendian–Cambrian Pay Horizons in the Central Part of the Nepsko-Botuobinskaya Anteclise

IF 0.3 Q4 GEOLOGY

Moscow University Geology Bulletin Pub Date : 2024-02-07 DOI:10.3103/s0145875223060066

I. V. Egorov, M. A. Bolshakova, O. V. Krylov

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Abstract

The study of the prospects in the central part of the Nepsko-Botuobinskaya Anteclise is focused on the subsalt oil and gas bearing horizons of Group B (Osinsky, Upper Ust-Kutsky, Lower Ust-Kutsky, and Preobrazhensky) and Group V (terrigenous formations of Vendian age). However, higher, in the Lower–Middle Cambrian carbonate-halogen deposits, there are also promising horizons of Group A (Kelorsky, Atovsky, Khristoforovsky, and Balykhtinsky) whose sufficient oil and gas content was confirmed in the neighboring Angara-Lena stage and in the north of the Nepsko-Botuobinskaya Anteclise and its adjacent structures. This paper examines the results of geochemistry tests of oil samples from the Osinsky horizon (layer B1) and the nameless dolomite layer located between the salts in the lower part of the Upper Usolskaya Subformation, which was previously considered gas-bearing at best. The tests conducted by the method of chromatography-mass spectrometry and the comparison of geochemical parameters of oils from different reservoirs show the similarity of hydrocarbon fluids of the Upper Usolskaya Subformation and of underlying pay horizons, which makes it possible to attribute them to a single oil and gas bearing system.

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上乌索尔斯卡亚亚层碳酸盐沉积物和尼泊尔-博图宾斯卡亚反地层中部文迪-寒武纪海平面的油类对比分析

摘要对 Nepsko-Botuobinskaya Anteclise 中部地区前景的研究主要集中在 B 组（Osinsky、Upper Ust-Kutsky、Lower Ust-Kutsky 和 Preobrazhensky）和 V 组（Vendian 时代的陆相地层）的盐下含油和含气地层。然而，在更高的下-中寒武统碳酸盐-卤化物矿床中，也有前景看好的 A 组地层（Kelorsky、Atovsky、Khristoforovsky 和 Balykhtinsky），其充足的石油和天然气含量已在邻近的安加拉-勒拿河期和 Nepsko-Botuobinskaya Anteclise 北部及其邻近构造中得到证实。本文研究了对来自奥辛斯基地层（B1层）和位于上乌索尔斯卡亚岩层下部盐类之间的无名白云岩层的石油样本进行地球化学测试的结果。用色谱-质谱法进行的测试以及对不同储油层的石油地质化学参数进行的比较表明，上乌索列斯卡亚岩层和下层地层的碳氢化合物流体具有相似性，因此可以将它们归属于一个单一的含油气系统。

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来源期刊

Moscow University Geology Bulletin GEOLOGY-

CiteScore

0.60

自引率

25.00%

发文量

期刊介绍： Moscow University Geology Bulletin is the journal that mainly publishes scientific articles, short reports of graduate students, and reviews. Publications made by the members of the Faculty of Geology of the Moscow State University and their collaborators are published. Publications encompass all branches of geology.