北里海下白垩统矿床的沉积环境

IF 0.3 Q4 GEOLOGY
V. V. Churkina, Yu. A. Kotochkova, G. A. Kalmykov
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引用次数: 0

摘要

摘要 本文介绍了北里海下白垩统(安息-阿尔卑斯)陆相沉积的沉积环境。这些岩石是石油和天然气储层,其特点是颗粒状和淤泥状组分分布不均,导致残余水含量高、渗透率低以及过滤能力特性之间的一致性差。为了正确解释地球物理数据,对岩石进行了详细的岩性和岩相分析。早白垩世研究区域主要存在以下海洋环境:沿海、浅海、水动力活跃的相对浅海陆架;水动力较弱的相对深水陆架。断面显示了从浅层到深层的变化,反之亦然,这使我们能够得出海平面周期性波动的结论。岩性分析结果清楚地表明,在始新世,浅海和沿岸沉积物占主导地位,而在白垩世,深海陆架沉积物占主导地位。因此,我们可以认为早白垩世末期发生了一次海侵,并在北里海的安普顿-阿尔比沉积剖面中发现了海侵的迹象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sedimentation Environments of the Lower Cretaceous Deposits of the North Caspian

Sedimentation Environments of the Lower Cretaceous Deposits of the North Caspian

Abstract

The article describes the sedimentation environments of Lower Cretaceous (Aptian–Albian) terrigenous deposits in the North Caspian. These rocks are oil and gas reservoirs and are characterized by an uneven distribution of the pelitic and silty fractions, which leads to a high content of residual water, low permeability, and poor consistency of the filtration-capacity properties with each other. A detailed lithological and facies analysis of the rocks was carried out for correct interpretation of geophysical data. The following marine environments predominated in the studied area in the Early Cretaceous: coastal, shallow marine, relatively shallow shelf with active hydrodynamics; relatively deep-water shelf with low hydrodynamics. The sections show a change from shallow to deeper facies and vice versa, which allows us to conclude periodic fluctuations in sea level. The results of lithological analysis clearly indicate the predominance of shallow marine and coastal sediments in the Aptian and deeper, shelf sediments in the Albian. Thus, we can suggest a sea transgression at the end of the Early Cretaceous and detect signs of it in the sections of Aptian–Albian deposits in the North Caspian.

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来源期刊
CiteScore
0.60
自引率
25.00%
发文量
43
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.
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