Carbonate reservoir outcrop analogues with a glance at pore-scale (Middle Jurassic, Lusitanian Basin, Portugal)

Azerêdo, Ana C.; Inês, Nuno; Bizarro, Paulo

doi:10.1016/j.marpetgeo.2019.08.034

Cited by 19 publications

(7 citation statements)

References 46 publications

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“…2). In the north, outer ramp to basinal facies persisted with the deposition of marls and marly limestones during the Bajocian-Callovian (upper part of the Cabo Mondego Formation) (Azerêdo et al, 2003(Azerêdo et al, , 2014(Azerêdo et al, , 2020 (Fig. 2).…”

Section: Upper Triassic -Callovianmentioning

confidence: 99%

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Jurassic Petroleum Systems in the Lusitanian Basin, Portugal: New Insights Based on Oil – Source Rock Correlations

Brito,

Rodrigues,

Baptista

et al. 2023

Journal of Petroleum Geology

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New stable carbon isotope and biomarker data for oils and source rock extracts from the Lusitanian Basin, Portugal, were studied in order to investigate the petroleum systems which are present there. The new analytical data was combined with data presented in previous publications, and oil‐oil and oil‐ source rock correlations were carried out. Three genetic groups of oils (Groups 1, 2 and 3), belonging to three different petroleum systems, were identified:Group 1 oils occur in the northern sector of the Lusitanian Basin and were generated by the Coimbra Formation (Sinemurian) source rock. Reservoir rocks for oils in this group are the Coimbra, Água de Madeiros (upper Sinemurian – lower Pliensbachian), Boa Viagem (Kimmeridgian –Tithonian) and Figueira da Foz (upper Aptian – Cenomanian) Formations. Other potential source rocks in the northern sector of the basin, such as the Polvoeira Member of the Água de Madeiros Formation and the Marly Limestones with Organic Facies (MLOF) Member of the Vale das Fontes Formation (Pliensbachian), had biomarker characteristics which differed from those of the Group 1 oils and did not therefore generate them.Group 2 oils occur in the central and southern sectors of the basin. The source rock is the Cabaços Formation (middle Oxfordian), and reservoir rocks are the Montejunto (middle‐upper Oxfordian) and Abadia (Kimmeridgian) Formations.Group 3 is represented by an oil sample from the central sector of the Lusitanian Basin. Both the source rock and the reservoir rock for the oil are the Montejunto Formation.Geochemical data combined with the regional tectono‐stratigraphic history suggest that the generation‐migration‐accumulation of most of the oil (critical moment) in the Coimbra – Coimbra ‐ Água de Madeiros ‐ Boa Viagem ‐ Figueira da Foz (!) petroleum system occurred in the early Campanian. For the Cabaços – Montejunto ‐ Abadia (!) and Montejunto – Montejunto (!) petroleum systems, the critical moment occurred in the late Cenomanian.

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Section: Upper Triassic -Callovianmentioning

confidence: 99%

“…From the Bajocian to the Callovian, inner-ramp limestones were deposited in the southern (Achada and Pedreiras Formations) and central (Chão das Pias, Serra de Aire and Santo António-Candeeiros Formations) sectors of the basin (Azerêdo et al, 2003(Azerêdo et al, , 2014(Azerêdo et al, , 2020Azerêdo, 2007) (Fig. 2).…”

Section: Upper Triassic -Callovianmentioning

confidence: 99%

Jurassic Petroleum Systems in the Lusitanian Basin, Portugal: New Insights Based on Oil – Source Rock Correlations

Brito,

Rodrigues,

Baptista

et al. 2023

Journal of Petroleum Geology

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“…The Lusitanian Basin (Figure 19A) is an Atlantic marginal extensional rift formed during the Triassic and subsequently reactivated in Middle and Late Jurassic times (Ravnås et al, 1997). A thick succession of marine early Jurassic carbonates was deposited on a WNW-dipping carbonate ramp (Azerêdo et al, 2020).…”

Section: Portugal -Palustrine Limestones In Coastal Lagoons and Lakesmentioning

confidence: 99%

Flooding of a carbonate platform: The Sian Kaʼan Wetlands, Yucatán, Mexico—A model for the formation and evolution of palustrine carbonate factories around the modern Caribbean Sea and in the depositional record

Platt¹,

Wright

2023

The Depositional Record

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The dynamic inter‐relationships between marine and freshwater carbonate depositional environments are illustrated in the Sian Ka'an Wetlands, a 5 280 km2 complex of groundwater‐fed freshwater marshes, lakes and brackish coastal lagoons in the South‐East Yucatán Peninsula (Mexico). The Yucatán Platform was subaerially emergent and extensively karstified during the last glacial maximum at 18, 000 yr bp. The Late Holocene transgression has caused progressive reflooding of the continental margin, backstepping of the MesoAmerican Reef and encroachment of coastal environments into the platform interior as rising groundwaters flood an interconnected cave and sinkhole system and feed seasonal marshes above. The Sian Ka'an Wetlands form a vast palustrine carbonate factory which is directly juxtaposed and dynamically linked with the marine carbonate factory to seaward. Continuing sea‐level rise has caused synchronous landward migration of marginal marine and freshwater environments as beach barriers were breached and palustrine sloughs flooded to form marginal marine seagrass lagoons. The Rio Hondo Fault conditions fluid inflow while the sub‐environments of the Sian Ka'an Wetlands reflect tectonic controls on microtopography and hydroperiod. Modern analogues for the Sian Ka'an Wetlands include the Florida Everglades, formed during transgression of the Florida Platform, and relict marsh environments preserved on leeward shores of Andros, Abaco and other Bahama islands. A wide range of ancient examples deposited in coastal and continental interior settings similarly reflect seasonal aquifer rise in response to marine transgression and/or onlap of late‐stage basin fill onto a karstified pediment. Freshwater palustrine carbonate factories on carbonate platforms are transient deposystems, controlled by subtle water depth, climate, vegetation and hydrological factors while being critically sensitive to sea‐level changes and tectonics. The preservation potential of palustrine carbonates may be relatively low in coastal settings due to erosion or shallow marine overprinting, while greater further inland where marine flooding is rarer and in tectonically subsident continental interior basins where accommodation space is continuously created.

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“…Incidentally, Magalhães et al (2023) cite Azerêdo (1988) but in the references wrongly assign it to her 1993 thesis; the former work is the original study of the Baleal section. These carbonate successions developed within the framework of a healthy carbonate ramp depositional system that prevailed for the whole of the Middle Jurassic in the LB (Azerêdo, 1988(Azerêdo, , 1993(Azerêdo, , 1998(Azerêdo, , 2007Azerêdo et al, 2014Azerêdo et al, , 2020. Thus, it is highly implausible that a siliciclastic system occurred simultaneously only in that small local section.…”

mentioning

confidence: 99%

“…However, the upper top limit of their Sequence J, underlying the Lourinhã Formation, does not represent the Middle/Upper Jurassic (Callovian/Oxfordian) disconformity; and the micropalaeontological evidence for assigning a Bathonian/Callovian age to the section they studied is not robust (discussed in detail below). In addition, they did not compare their sequence scheme with published cycles for the Middle Jurassic interval of the LB (Azerêdo et al, 2014(Azerêdo et al, , 2020. Magalhães et al (2023) address three microfossil groups: ostracods, calcareous nannofossils and palynomorphs.…”

mentioning

confidence: 99%

Discussion on ‘Middle Jurassic multi‐scale transgressive–regressive cycles: An example from the Lusitanian Basin’, by Magalhães et al., Depositional Record, 2023, 9(1), 174–202

Azerêdo,

Correia,

Fraguas

2023

The Depositional Record

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Carbonate reservoir outcrop analogues with a glance at pore-scale (Middle Jurassic, Lusitanian Basin, Portugal)

Cited by 19 publications

References 46 publications

Jurassic Petroleum Systems in the Lusitanian Basin, Portugal: New Insights Based on Oil – Source Rock Correlations

Jurassic Petroleum Systems in the Lusitanian Basin, Portugal: New Insights Based on Oil – Source Rock Correlations

Flooding of a carbonate platform: The Sian Kaʼan Wetlands, Yucatán, Mexico—A model for the formation and evolution of palustrine carbonate factories around the modern Caribbean Sea and in the depositional record

Discussion on ‘Middle Jurassic multi‐scale transgressive–regressive cycles: An example from the Lusitanian Basin’, by Magalhães et al., Depositional Record, 2023, 9(1), 174–202

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