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Controls of fracturing on porosity in pre-salt carbonate reservoirs

Energy Geoscience 2023年第2期4卷 49-61页

作者： Wagner Moreira Lupinacci Tuany Younis Abdul Fatah Maria Cordeiro do Carmo antonio Fernando Menezes Freire luiz antonio pierantoni gamboa Exploratory Interpretation and Reservoir Characterization Group(GIECAR) Department of Geology and GeophysicsUniversidade Federal FluminenseNiteróiRio de Janeiro24210346Brazil National Institute of Science and Technology of Petroleum Geophysics(INCT-GP/CNPQ) NiteróiRio de Janeiro24210346Brazil

This work aims to improve the understanding of how fracture zones affect carbonate reservoir properties based on observations of a pre-salt well located in the Santos Basin,*** identification of fracture zones allowed for the observation of a relationship between the occurrence of rock fractures and the silicification,as the latter plays an important role in determining porosity(higher silica content may increase brittleness of the rocks therefore increasing the likelihood of creating fractures zones and fractures may be filled up reducing the total porosity).To support the proposed observation,an integrated study was conducted using borehole imaging,spectroscopy logs,and sidewall core *** porosities were defined using nuclear magnetic resonance log analysis,alongside sidewall core samples,and thin *** integration of rock samples and well data with seismic analysis was performed to analyze the presence of a regional fault system that could explain high fracture densities as well as observed silica content *** results show how different types of cement filling up the formation pores affect fracture densities and total ***,it was possible to infer that the amount of silica content observed in well logs and thin sections relates to hydrothermal fluids reaching out the reservoir through regional fault systems detected in the seismic ***,this paper supports the comprehension of how diagenetic processes can significantly affect the properties of presalt reservoirs.

关键词： Fracture Porosity Pre-salt carbonatereservoir Santos Basin

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