气候变化领域集成服务门户(CCPortal): Sedimentology and petrophysical analysis of pre-salt lacustrine carbonate reservoir from the Santos Basin; southeast Brazil

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DOI	10.1007/s00531-020-01932-7
	Sedimentology and petrophysical analysis of pre-salt lacustrine carbonate reservoir from the Santos Basin; southeast Brazil
	Basso M.; Belila A.M.P.; Chinelatto G.F.; Souza J.P.P.; Vidal A.C.
发表日期	2020
ISSN	14373254
英文摘要	Lacustrine carbonate deposits mark the rift-sag sedimentation stage of the so-called pre-salt section of the Campos and Santos Basins, in the Southeast Brazilian continental shelf. These salt-sealed carbonate reservoirs form deep-water, giant and prolific oil fields that are currently responsible for approximately 70% of the Brazilian oil and gas production. In the Santos Basin, the sag stage carbonates are represented by the Aptian Barra Velha Formation, characterized by exotic textural and compositional features whose origin, development, and correlation with petrophysical properties have been broadly discussed in the last decade. A geological and petrophysical study has been performed based on core samples, plugs, and thin-sections of a well in the Barra Velha Formation from the eastern Santos Basin. The analyzed core interval was grouped into six depositional facies constituted by the association of five key textural components: (1) crystal shrubs; (2) calcite spherulites; (3) hybrid forms; (4) mud-grade carbonates and dolomite; and (5) intraclasts. The relationship between the depositional framework and the poroperm system, as evidenced by petrographic image analysis and CT-scan data, is highly complex. The depositional control over porosity is erratic, mainly due to the extensive diagenetic and possible hydrothermal overprint. Dolomite cementation, dolomitization, pervasive silicification, and dissolution processes are the main primary porosity modifiers. Petrophysical analysis indicates that intraclastic and spherulitic grainstones–rudstones, affected by matrix dissolution, may present the best reservoir properties, in certain intervals, even surpassing the shrubby framestones, which are widely regarded as the best reservoir facies. This study seeks to contribute to an emerging body of research about the Brazilian pre-salt lacustrine carbonates, broadening the geological knowledge about these deposit, while providing new data to improve hydrocarbon forecast and recovery. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Brazilian pre-salt; Cretaceous; CT-scan; Lacustrine carbonates; Petrophysics; Santos Basin
语种	英语
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147758
作者单位	Department of Geology and Natural Resources, Geosciences Institute, University of Campinas (UNICAMP), Campinas, Brazil; Center for Petroleum Studies (CEPETRO), University of Campinas (UNICAMP), Campus Universitario Zeferino Vaz-Barão Geraldo, Campinas, SP CEP: 13083-970, Brazil; Department of Energy, School of Mechanical Engineering, University of Campinas (UNICAMP), Campinas, Brazil
推荐引用方式 GB/T 7714	Basso M.,Belila A.M.P.,Chinelatto G.F.,et al. Sedimentology and petrophysical analysis of pre-salt lacustrine carbonate reservoir from the Santos Basin; southeast Brazil[J],2020.
APA	Basso M.,Belila A.M.P.,Chinelatto G.F.,Souza J.P.P.,&Vidal A.C..(2020).Sedimentology and petrophysical analysis of pre-salt lacustrine carbonate reservoir from the Santos Basin; southeast Brazil.International Journal of Earth Sciences.
MLA	Basso M.,et al."Sedimentology and petrophysical analysis of pre-salt lacustrine carbonate reservoir from the Santos Basin; southeast Brazil".International Journal of Earth Sciences (2020).