Microfacies analysis and depositional environment of the Upper Devonian Dankovo-Lebedyansky sediments, Tatarstan, Volga-Ural Basin, Russia

Q1 Earth and Planetary Sciences
Ibrahem Yousef, V. P Morozov, A. N Kolchugin, V. Sudakov, I. Idrisov, A. Leontev
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引用次数: 1

Abstract

The Upper Devonian, Middle Famennian Dankovo-Lebedyansky sediments in Southeast Tatarstan territory are a carbonate sequence composed of limestone and dolomite, which is important hydrocarbon reservoir units, therefore, it is necessary to conduct in-depth study on its microfacies and depositional environment. In this study, a multidisciplinary approach that combines core observation with thin section examination is used. The limestone contains abundant skeletal grains (echinoderms, foraminifera, algae, gastropods, and calcispheres), as well as non-skeletal grains (intraclasts and peloids). On the basis of detailed petrographic investigations, six sedimentary microfacies can be identified, including (i) peloidal grainstone (MF 1), (ii) cemented bioclastic peloidal grainstone (MF 2), (iii) echinoderm-concentrated packstone (MF 3), (iv) algae packstone (MF 4), (v) bioclastic wackestone (MF 5), (vi) whole-fossil wackestone (MF 6), as well as dolomite or dolostone as diagenetic facies (MF 7). Based on microfacies analysis, the Dankovo-Lebedyansky sediments were deposited in three distinct sedimentary facies belts (shoal, lagoon and open marine environment). In order to reflect dispositional energy condition, the microfacies were grouped into facies associations: (i) low-energy microfacies associations including MF 5 and MF 6, (ii) moderate energy microfacies associations including MF 1, MF 2, MF 3, and MF 4. The dolomite, or diagenetic facies (MF 7), is the result of slightly to extensively dolomitization of limestone in the Dankovo-Lebedyansky sediments. Most of frequent dolostone types are euhedral planar-e and subhedral planar-s. According to petrographic characteristic of the dolostone, a seepage reflux model can be used to explain the dolomitization process of Dankovo-Lebedyansky sediments.

俄罗斯伏尔加-乌拉尔盆地鞑靼斯坦上泥盆统丹科沃-列别丹扬斯基沉积微相分析及沉积环境
鞑靼斯坦东南部地区上泥盆纪、中法门阶Dankovo-Lebedyansky沉积是一个由石灰岩和白云石组成的碳酸盐岩序列,是重要的油气藏单元,因此有必要对其微相和沉积环境进行深入研究。在这项研究中,使用了一种多学科的方法,将核心观察与薄切片检查相结合。石灰岩中含有丰富的骨骼颗粒(棘皮动物、有孔虫、藻类、腹足类动物和钙球类动物),以及非骨骼颗粒(鞘内颗粒和骨盆)。在详细的岩相调查基础上,可以识别出六种沉积微相,包括(i)似球粒粒状灰岩(MF 1)、(ii)胶结生物碎屑似球粒状灰岩(MF2)、(iii)棘皮动物浓缩泥粒石(MF 3)、,以及作为成岩相的白云石或白云岩(MF7)。根据微相分析,Dankovo-Lebedyansky沉积分为三个不同的沉积相带(浅滩、泻湖和开阔海洋环境)。为了反映沉积能量条件,将微相划分为相组合:(i)低能量微相组合,包括MF5和MF6;(ii)中等能量微相组,包括MF1、MF2、MF3和MF4。白云岩或成岩相(MF7)是Dankovo-Lebedyansky沉积物中石灰岩轻微到广泛白云石化的结果。大多数常见的白云岩类型为自形平面-e和半自形平面-s。根据白云岩的岩石学特征,可以采用渗流-回流模型来解释Dankovo-Lebedyansky沉积物的白云石化过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Petroleum Research
Petroleum Research Earth and Planetary Sciences-Geology
CiteScore
7.10
自引率
0.00%
发文量
90
审稿时长
35 weeks
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