南大西洋盐下岩的可操作分类系统

IF 2 4区 地球科学 Q1 GEOLOGY Journal of Sedimentary Research Pub Date : 2023-07-19 DOI:10.2110/jsr.2022.103
L. F. De Ros, Daniel M. Oliveira
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引用次数: 0

摘要

南大西洋盐下剖面阿普田巨型储层及其伴生湖相岩呈现出一系列独特的特征,这使得为海相碳酸盐岩建立的分类体系非常不充分。根据我们对巴西盆地数千个盐下储层和伴生矿床样品的表征经验,以及广泛的文献评价,我们提出了一个客观和可操作的系统,用于分类不寻常的,但极其重要的盐下湖相岩石。该系统可以对原位和再沉积岩石类型的结构、结构、原始结构和组成以及主要成岩作用进行连贯记录。根据方解石球晶、束状灌木和泥质基质的原始比例,直接对原地岩石进行分类。再沉积岩根据bb0 ~ 2mm颗粒的原始体积和砂泥比例进行分类,采用钙积岩、钙积岩和钙积岩作为不偏不倚的名称。该方法也可应用于其他颗粒型碳酸盐岩的分类,避免了现有分类系统的概念问题和对沉积环境和储层质量的模糊解释。提出的直接、客观、直观的分类体系将有助于对南大西洋盐下油气省的认识、勘探和生产。
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An operational classification system for the South Atlantic pre-salt rocks
The giant Aptian reservoirs and associated lacustrine rocks of the South Atlantic Pre-Salt section present a series of unique characteristics, which make the systems created for marine carbonate rocks quite inadequate for their classification. Based on our experience with the characterization of thousands of samples of the Pre-Salt reservoirs and associated deposits from the Brazilian basins, and on a wide literature evaluation, we propose an objective and operational system for the classification of the unusual, yet extremely important Pre-Salt lacustrine rocks. The system allows the coherent record of structure, fabric, primary texture and composition, and main diagenetic modifications of the in situ and resedimented rock types. The in situ rocks are directly classified according to the original proportion among calcite spherulites, fascicular shrubs and mud matrix. The resedimented rocks are classified according to the original volume of > 2mm particles and the proportion between sand and mud, using calcirudite, calcarenite and calcilutite as unbiased names. Such approach can also be applied for the classification of other particulate carbonate rocks, avoiding the conceptual problems and dubious interpretation of depositional environment and reservoir quality of currently used classification systems. The direct, objective and instinctive proposed classification system shall contribute to the understanding, exploration and production of the extraordinary South Atlantic Pre-Salt petroleum province.
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
期刊最新文献
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