What is the Role of Volcanic Rocks in the Brazilian Pre-salt?

Luca, Paolo De; Carballo, José Luís; Filgueiras, Ana Virginia; Pimentel, Gustavo Antunes; Esteban, Mateu; Tritlla, J.; Villacorta, R.

doi:10.3997/2214-4609.201412890

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…How, for example, would an igneous rock be one of the reservoirs in the pre-and post-salt? As observed in the Santos and Campos Brazilian basins in fractured Cretaceous basalts of the syn-rift phase by De Luca et al (2015), as well as Fornero et al (2019) lavas flow units. Would a volcanic rock get a prominent role in geological and/or geophysical studies of a basin?…”

Section: Discussionsupporting

confidence: 51%

“…However, productivity declined, even though it stabilized, for some decades, in a production of approximately 2,000 BOPD (Guardado et al, 1990;Bruhn et al, 2003). The Brazilian fields case has two highlights: the first is that igneous rocks and their thermal influence have a secondary importance, as it happens in other countries, even though they are quite common in sedimentary basins (Thomaz Filho et al, 2008;Costa et al, 2016;Miranda et al, 2018;Penna et al, 2018;Cioccari & Mizusaki, 2019;Fornero et al, 2019;Correia et al, 2019;Avellar & Pereira, 2019); and second is about the complexity in offshore regions added to the presence of the pre-salt, especially in prospects of microbial carbonates and coquinas, as noted by De Luca et al (2015). In other words, better understanding the igneous rock can improve the characterization of reservoirs (sometimes in a complex geology site) as a whole, in the oil system in general, since its presence is recurrent in many prospects.…”

Section: Fractured Andesitesmentioning

confidence: 99%

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Volcanic reservoirs: historic and current context

et al. 2021

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Within the oil and gas industry, igneous rocks are still seen as exploration and production challenges, due to their diverse petrogenesis and the wide range of values of some important petrophysical properties. This petrophysical variability depends on both primary and secondary processes. These facts made these rocks unattractive for decades. This condition is still observed in many fields around the world. This article has as main objective to make a historical review of studies developed globally with a focus on igneous rocks that act as a reservoir in petroleum systems. The review covered in this article was developed from a compilation of global data, thus allowing an overview of the countries that produce hydrocarbons in volcanic rocks, what types of rocks, geological age, and size of the reserve. Countries such as China and Indonesia stand out with higher daily production, exceeding orders of quantities of 108 cubic meters of gas and 104 tons of barrels of oil. In these countries, geological patterns are already being noticed in volcanic reservoirs, such as more recent geological ages and typical lithologies. Also, this work seeks to emphasize the importance of studying this type of reservoir, as its knowledge can lead to the solution of real problems within the world oil and gas industry.

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Section: Discussionsupporting

confidence: 51%

Section: Fractured Andesitesmentioning

confidence: 99%

Volcanic reservoirs: historic and current context

et al. 2021

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“…We can divide the magmatism in the Santos Basin into two groups: Lower Cretaceous and Upper Cretaceous/Paleogen (De Luca et al, 2015). The former is usually associated with the rift phase with basalt-tholeiitic magmas that showed Ar-Ar ages between 137-122 M.y.…”

Section: Tectonic Settingmentioning

confidence: 99%

“…The second group is usually associated with alkaline series, represented by ultramafic, mafic (basaltic), and felsic magmas (trachytes/syenites, phonolites/nepheline syenites) with Ar-Ar ages between 90-43 M.y. (De Luca et al, 2015). Plawiak et al (2022) have identified late-rift/post-rift faultrelated structures and km-scale elongated conical-shaped buildups forming fissure ridges genetically related to the syn-rift basement faults in the Jupiter area.…”

Section: Tectonic Settingmentioning

confidence: 99%

Structural controls of the migration of mantle-derived CO2 offshore in the Santos Basin (Southeastern Brazil)

Plawiak,

Carvalho,

Sombra

et al. 2024

Front. Earth Sci.

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We present a multi-scale conceptual model based on structural controls of the migration of mantle-derived CO2 offshore in the Santos Basin (Southeastern Brazil). We assembled the model from a regional 2D seismic reflection line integrated with potential gravimetric field data and a local 3D seismic reflection volume integrated with well data (lithologies and in situ stress). (i) The geochemical isotope range of δ13CCO2 falls mostly within −7‰ and −5‰ and shows relatively high values for 3He/4He represented by an R/Ra rate of up to 5.60, indicating CO2 mantle generation and degassing. (ii) Seismic interpretation feasibly validated by potential gravimetric responses of the crustal structure (Moho discontinuity) show CO2 migration through deep-seated faults in a region of highly stretched continental crust with oceanward mantle uprising. (iii) Early Cretaceous basement highs generated in an obliquely syn-rift faulting system control CO2 accumulation in thermogenic travertines (hydrothermal carbonate reservoirs of continental lakes), and Aptian evaporites subsequently trap it.

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