阿普田盐下边缘沉积条件:来自巴西Espírito Santo盆地Mucuri段定量岩石学和结构分析的证据

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
G. Pantopoulos, Gustavo Kenji Lacerda Orita, G. Armelenti, Camila Eliza Althaus, J. Kuchle, C. Scherer, A. G. Rodrigues, L. F. De Ros
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引用次数: 1

摘要

Mucuri成员的Aptian硅屑碎屑陆上矿床是Espírito Santo盆地(巴西东部)的重要储层。对岩心样品进行了详细的定量岩石学和结构分析,以揭示其沉积过程和沉积条件,并与先前提出的沉积模型相关联。结果表明,两组砂岩样品具有不同的结构特征,与穆库里沉积体系中不同的沉积过程和环境有关。河流砂岩以中粗粒、分选差的长石为代表,富含深成岩碎片和长石颗粒,主要受牵引搬运作用。海岸湖相砂岩对应于极细至细粒、中等分选的云母砂岩,主要以悬浮形式搬运。基于粒度参数的判别函数的应用验证了先前提出的研究样本组的沉积设置。粒度和形状数据的结合揭示了不同沉积背景下颗粒的水力等效性和形状的差异。在水力等效方面,河流沉积物中的云母沉降速度值较低,而沿海沉积物中的云母颗粒相对较大,与伴生的石英和长石颗粒水力等效。本研究结果提供了阿普田盐下系统边缘沉积条件(搬运机制、颗粒沉降速度和矿物水力分异)的关键信息,这些信息可以约束远湖区水文条件和沉积物类型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Depositional conditions at the Aptian pre-salt margins: evidence from quantitative petrography and textural analysis of the Mucuri Member, Espírito Santo Basin, Brazil
Aptian siliciclastic onshore deposits of the Mucuri Member are important reservoirs in the Espírito Santo Basin (eastern Brazil). A detailed quantitative petrographical and textural analysis of well core samples was performed in order to unravel their depositional processes and conditions, in relation to previously proposed depositional models. The results allowed differentiation between two groups of sandstone samples, characterized by different textural characteristics associated to different depositional processes and environments within the Mucuri depositional system. Fluvial sandstones are represented by medium- to coarse-grained, poorly sorted arkoses, rich in plutonic rock fragments and feldspar grains, mainly transported by traction. Coastal-lacustrine sandstones correspond to very fine- to fine-grained, moderately sorted micaceous arkoses, mainly transported in suspension. The application of a discriminant function based on grain-size parameters validated previously proposed depositional settings for the studied sample groups. The combination of grain-size and shape data revealed differences in hydraulic equivalence and shape between grains from different depositional settings. In terms of hydraulic equivalence, micas in the fluvial sediments present lower settling velocity values, in contrast to the relatively large mica grains in the coastal sediments, which are hydraulically equivalent with the associated quartz and feldspar grains. The results of this study provide key information regarding depositional conditions (transportation mechanisms, grain-settling velocity and mineral hydraulic fractionation) at the margins of the Aptian pre-salt system, which can constrain the hydrological conditions and the sediment type available for distal lacustrine areas.
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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