{"title":"南大西洋盐下岩的可操作分类系统","authors":"L. F. De Ros, Daniel M. Oliveira","doi":"10.2110/jsr.2022.103","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":17044,"journal":{"name":"Journal of Sedimentary Research","volume":null,"pages":null},"PeriodicalIF":2.0000,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"An operational classification system for the South Atlantic pre-salt rocks\",\"authors\":\"L. F. De Ros, Daniel M. Oliveira\",\"doi\":\"10.2110/jsr.2022.103\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"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.\",\"PeriodicalId\":17044,\"journal\":{\"name\":\"Journal of Sedimentary Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.0000,\"publicationDate\":\"2023-07-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Sedimentary Research\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.2110/jsr.2022.103\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Sedimentary Research","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.2110/jsr.2022.103","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOLOGY","Score":null,"Total":0}
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.
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.