Sedimentology and petrophysical analysis of pre-salt lacustrine carbonate reservoir from the Santos Basin, southeast Brazil

Basso, Mateus; Belila, Aline Maria Poças; Chinelatto, Guilherme Furlan; Souza, João Paulo da Ponte; Vidal, Alexandre Campane

doi:10.1007/s00531-020-01932-7

Cited by 30 publications

(17 citation statements)

References 24 publications

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“…In this view, the presence of travertine deposits in the Brazilian and Angolan Pre‐salt is reported by many authors (Renaut et al, 2013; Sabato Ceraldi & Green, 2016; Saller et al, 2016; Wright & Barnett, 2015), as well as the presence of shrub‐like fabrics, considered to be one of the most promising reservoir units (Alvarenga et al, 2016; Dias, 2004; Rezende & Pope, 2015; Saller et al, 2016; Wright, 2012; Wright & Barnett, 2015). Despite the difference between the Pre‐salt shrubs, principally composed of crystalline fabrics, the shrub boundstone of the Testina travertine could represent an important analogue in terms of depositional setting and environmental conditions, principally related to a supersaturated environment affected by high carbonate precipitation and evaporation phenomena (Basso et al, 2020; Erthal et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…In this view, the presence of travertine deposits in the Brazilian and Angolan Pre-salt is reported by many authors (Renaut et al, 2013;Sabato Ceraldi & Green, 2016;Saller et al, 2016;Wright & Barnett, 2015), as well as the presence of shrub-like fabrics, considered to be one of the most promising reservoir units (Alvarenga et al, 2016;Dias, 2004;Rezende & Pope, 2015;Saller et al, 2016;Wright, 2012;Wright & Barnett, 2015). Despite the difference between the Pre-salt shrubs, principally composed of crystalline fabrics, the shrub boundstone of the Testina travertine could represent an important analogue in terms of depositional setting and environmental conditions, principally related to a supersaturated environment affected by high carbonate precipitation and evaporation phenomena (Basso et al, 2020;Erthal et al, 2017). Shrub boundstone occurrences are reported by many authors from several places in the world (Japan, Turkey, Italy, USA; Chafetz & Folk, 1984;Della Porta et al, 2017aErthal et al, 2017;Fouke, 2011;Fouke et al, 2000;Guo & Riding, 1994, 1998Kitano, 1963), forming in chemically harsh and hot hydrothermal waters, in shallow lakes and depressional depositional settings or in flat waterlogged environments (Chafetz & Folk, 1984;Chafetz & Guidry, 1999;Capezzuoli et al, 2014;Claes et al, 2017b;Erthal et al, 2017;Guo & Riding, 1998;Jones & Renaut, 1995;Jones et al, 2000;Turner & Jones, 2005).…”

Section: Testina Travertine As a Possible Subsurface Analoguementioning

confidence: 99%

“…Over the last several years, interest in continental carbonates has increased both in the academic world and in the oil industry, due to the discovery of South Atlantic Pre‐salt carbonate reservoirs (Brazil and Angola—Saller et al, 2016; Terra et al, 2010) that display similarities with travertines (Alvarenga et al, 2016; Basso et al, 2020). In the framework of the Pre‐salt carbonate reservoirs discovered in Brazil and Angola, interpreted as lacustrine freshwater to alkaline deposits (Sabato Ceraldi & Green, 2016; Saller et al, 2016; Wright & Barnett, 2015) and sometimes associated with travertines derived from vents or spring mounds (Alvarenga et al, 2016), the study of exposed reservoir analogues is fundamental to assess reservoir architecture (Casanova, 1994; Della Porta, 2015; Jones & Renaut, 1995; Mancini et al, 2019a; Renaut et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Such reservoirs are characterised by the presence of shrub-like fabrics (Dias, 2004;Rezende & Pope, 2015;Terra et al, 2010), representing for many authors one of the most important targets for oil exploration due to the associated high permeability (Wright, 2012;Wright & Barnett, 2015). Despite the crystalline composition of the Pre-salt shrubs, these deposits are morphologically similar to the shrub boundstone described in the Testina travertine (Basso et al, 2020;Claes et al, 2017b;Chafetz & Folk, 1984;Erthal et al, 2017;Guo & Riding, 1998), and for this reason this study can provide useful information to better understand the spatial distribution of shrub lithologies in subsurface reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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The role of tectonic activity, topographic gradient and river flood events in the Testina travertine (Acque Albule Basin, Tivoli, Central Italy)

Scalera

Mancini

Capezzuoli

et al. 2021

The Depositional Record

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The Acque Albule Basin in Tivoli (Rome, Central Italy) represents one of the largest exposures of travertine deposits in the world. A detailed study of the Upper Pleistocene Testina travertine, constituting the poorly lithified top part of the Lapis Tiburtinus travertines, is presented. Fieldwork performed in an area of 10 km2 and petrographic analysis allow the recognition of six geobodies with different geometries, degree of diagenetic alteration and architectural elements, composed of seven lithotypes. The Testina travertine appears in general as a poorly lithified travertine, even if it shows a high degree of cementation. It is mainly characterised by blocky, drusy or bladed microsparite and sparite calcite cements, related to thermal and meteoric phreatic to vadose water circulation, affecting in particular those travertine deposits located in the northern part of the study area. The Testina, neglected until now in the several studies performed in the Acque Albule Basin, shows a progradational trend from the north to the south and is characterised by environments, evidencing deposition on a gentle slope, in an alluvial plain and in a shallow lake, with gradual transitions between low‐energy environments and high‐energy environments. Furthermore, based on correlation between the different geobodies in the overall study area, the Testina travertine depositional system was influenced by tectonic activity in the northern part, by an increasing topographic gradient and water discharge flow in the central part and by flooding events related to the Aniene River in the southern part. This study aims to differentiate such influencing factors facilitating the analysis of other travertine depositional systems and also to aid in the interpretation of subsurface analogues, as in the case of South Atlantic Pre‐Salt reservoirs.

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Section: Discussionmentioning

confidence: 99%

Section: Testina Travertine As a Possible Subsurface Analoguementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The role of tectonic activity, topographic gradient and river flood events in the Testina travertine (Acque Albule Basin, Tivoli, Central Italy)

Scalera

Mancini

Capezzuoli

et al. 2021

The Depositional Record

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show abstract

“…13 Since 2006, several giant oil and gas fields such as Lula, Jupiter, Sapinhoa, Franco, and Libra have been continuously discovered in the field of lacustrine carbonates of the subsalt strata in the deep-water area of the Santos Basin, revealing that the subsalt strata of the basin have rich oil and gas resources and great exploration potential. 14 − 16 …”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics and Distribution of the Subsalt Source Rocks in the Santos Basin, Brazil

Zuo¹,

Wang²,

Fan³

et al. 2022

ACS Omega

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The Santos Basin in Brazil is a hot area of oil and gas exploration in recent years, and its subsalt lacustrine mudstones are the main source rock of the basin. However, there is a lack of studies on the source rocks of the subsalt Picarras and Itapema formations, which is not conducive to the accurate evaluation of the source rock characteristics. Based on logging data of 51 wells and geochemical data of 16 wells, this paper makes detailed evaluations of the organic matter abundance, type, maturity, and distribution characteristics of source rocks of the subsalt Picarras Formation and Itapema Formation in the Santos Basin. The results show that the characteristics of source rocks of the Itapema and Picarras formations are similar, both of which have a high abundance of organic matter. The types of organic matter are mainly type I and II 1 , and the maturities are in the low-maturity to the high-maturity stage, which meets the standard of good source rocks. The total organic carbon content of the source rocks of the Picarras Formation ranges from 0.4 to 4.0%, much lower than that of the source rocks of the Itapema Formation, 0.8–5.6%. In addition, the hydrogen index average value of the source rocks of the Itapema Formation is 712.8 mg/g TOC, higher than that of the Picarras Formation, 697.5 mg/g TOC, both revealing a great hydrocarbon potential. The quality of source rocks of the Itapema Formation is better than that of the Picarras Formation. The two sets of source rocks have great hydrocarbon generation potential and are mainly developed in the eastern and western sags of the central depression. Therefore, the surrounding uplift areas will be the target for further oil and gas exploration.

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Prediction of lithology in lacustrine carbonates using well logs: The Cretaceous Barra Velha Formation in Santos Basin, offshore Brazil

Wang¹,

Zhang

Fan³

et al. 2023

Geological Journal

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Abundant hydrocarbons have been produced from the pre‐salt lacustrine carbonates of the Cretaceous Barra Velha Formation in the Santos Basin of offshore Brazil. The highly heterogeneous lithology and pore systems make it difficult to predict the reservoir quality via petrophysical well logs. Core description, computed tomography (CT) scanning, thin sections and wireline well logs are utilized to characterize the lithology, pore spaces are reservoir quality of the Cretaceous Barra Velha Formation pre‐salt lacustrine carbonates in the Santos Basin. The results show that the lithology mainly includes shrubstone, grainstone, laminated micrite and massive micrite. The pore systems are dominated by secondary pores, such as intergranular pores, dissolution pores and intercrystalline pores as well as modified primary pores. Geological well logs (conventional well logs, electrical and sonic image logs and nuclear magnetic resonance [NMR] logs) are integrated to build the predictable models of the carbonate reservoirs. The shrubstone, which is dominated by intergranular pores, has the highest reservoir quality, which can be derived from NMR logs. Grainstone contains both primary intergranular pores and abundant secondary dissolution pores. The laminated and massive micrite contain only micropores and therefore have the lowest reservoir quality. Lastly, conventional well logs integrated with electrical and sonic image logs are utilized to predict the distribution of lithology and reservoir quality in single wells, and the results are testified by the NMR log data. The shrubstone and grainstone are future exploration targets of the Cretaceous Barra Velha Formation in the Santos Basin. The results are hoped to give insights into the petrophysical behaviours of various lithologies, and provide theoretical and technical guidance for reservoir evaluation and prediction.

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Sedimentology and petrophysical analysis of pre-salt lacustrine carbonate reservoir from the Santos Basin, southeast Brazil

Cited by 30 publications

References 24 publications

The role of tectonic activity, topographic gradient and river flood events in the Testina travertine (Acque Albule Basin, Tivoli, Central Italy)

The role of tectonic activity, topographic gradient and river flood events in the Testina travertine (Acque Albule Basin, Tivoli, Central Italy)

Geochemical Characteristics and Distribution of the Subsalt Source Rocks in the Santos Basin, Brazil

Prediction of lithology in lacustrine carbonates using well logs: The Cretaceous Barra Velha Formation in Santos Basin, offshore Brazil

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