South Atlantic Conjugate Margin: An Exploration Strategy

Borsato, R.; Jones, Washington; Greenhalgh, J.; Martin, M.; Roberson, R.; Fontes, C.; Markwick, Paul J.; Quallington, A.

doi:10.3997/1365-2397.30.12.65620

Cited by 8 publications

(4 citation statements)

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“…Margin (adapted from Borsato et al, 2012). Also shown is the occurrence of MTDs and fluid flow features observed from the study area from this study.…”

Section: Fig 2 Simplified Stratigraphic Column and Petroleum Systems ...mentioning

confidence: 93%

3d Seismic Analysis of Cenozoic Slope Deposits and Fluid Flow Phenomena Along the Nigerian Transform Margin

Olobayo¹,

Huuse²

2023

Preprint

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High-resolution 3D seismic data covering an area of 2,845 km2 provide new insights on slope deposits and fluid-flow phenomena along the Nigerian Transform Margin, focusing on the ~ 2 km thick Cenozoic post-transform succession. The study documents large-scale mass-transport complexes, deep-water channel complexes, sediment waves, and a wide range of fluid flow phenomena. The focused fluid flow phenomena include pockmarks, vertical pipes, seabed mounds and gas-hydrate related bottom simulating reflections. They are observed from Pliocene-aged sediments and distributed above structural highs, regional faults and active and relic deep-water channels in the eastern part of the study area, closest to the Niger Delta cone. The identified fluid flow features could be indicative of an active petroleum system in the deeper subsurface, and fluids could have migrated along planes of deep-seated, regional faults. The mass- transport deposits are mapped at multiple levels and the volume of failed sediments increased through time such that they constitute very significant portion of the entire stratigraphic succession (up to 25%) within the western part of the study area. The repeated and increased volume of mass transport deposit in the area is attributed to increased rate of sedimentation through time, slope gradient and probably increasing amplitude of sea level change during the late Cenozoic. The presence of repeated mass-transport deposits and fluid flow phenomena on the Nigeria Transform Margin has implications for installations of offshore facilities as they constitute potential geohazards. The study documents, for the first time, polygonal fault systems offshore Nigeria, adding to the global inventory of polygonally-faulted claystones, and suggesting a more oceanic dominated mudstone sedimentation than nearer the Niger Delta.

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“…Margin (adapted from Borsato et al, 2012). Also shown is the occurrence of MTDs and fluid flow features observed from the study area from this study.…”

Section: Fig 2 Simplified Stratigraphic Column and Petroleum Systems ...mentioning

confidence: 93%

3d Seismic Analysis of Cenozoic Slope Deposits and Fluid Flow Phenomena Along the Nigerian Transform Margin

Olobayo¹,

Huuse²

2023

Preprint

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“…In general terms, the facies assigned to microbialites in the Brazilian pre-salt were developed in lacustrine shallow marine depositional environment during the Sag phase, which suggests that microbial organisms played important roles in sediment production and accumulation (e.g. Borsato et al 2012, Dorobek et al 2012, Lima and De Ros 2019. In Yacoraite Formation, a carbonate-dominated succession has been also deposited during a sag phase in the Salta rift system (Roemers-Oliveira et al 2015).…”

Section: Economic Interest Of Microbialite Levels In the Yacoraite Fo...mentioning

confidence: 99%

Microbialitic deposits of the Yacoraite Formation, NW Argentina: distribution, environments, paleoecology, and economic implications

et al. 2022

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The Yacoraite Formation (NW Argentina) displays important microbialitic deposits of varied features throughout its six sub-basins. With the discovery of important microbialitic hydrocarbon reservoirs and the interest in lacustrine systems due to recent hydrocarbon finds in the presalt Cretaceous series of the South Atlantic, the importance of these organo-sedimentary structures has increased considerably. Because of this, in the past decade, numerous works in Yacoraite Formation have focused on its microbialites. In this study, we provide an updated summary of the existing background and state of knowledge of the microbialites in the Yacoraite Formation, which occupy different stratigraphic positions in diverse sub-basins separated by several kilometers. Due to this, these structures have developed under diverse conditions, giving rise to a great variety of structures and morphologies, useful as reliable and high-resolution proxies for paleoenvironmental studies and to discuss important ecological paradigms. In addition, microbialites of Yacoraite Formation show promising petrophysical conditions to be evaluated as reservoir rocks. Based on the large number of deposits mentioned throughout this work, and the morphological and structural variety of their microbialites, we can highlight Yacoraite Formation as one of the most important microbialite-bearing units in Argentina and South America.

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“…: Ruszkiczay-Rüdiger et al, 2005;Antoine et al, 2007;Burnside et al, 2013). Finally, interest in travertine has significantly increased in the past two decades because they have been considered to make up hydrocarbon reservoirs in the so-called Pre-Salt play offshore Brazil and Angola (Terra et al, 2010;Borsato et al, 2012;Lottaroli et al, 2012). Therefore, reservoir analogues were intensively studied as reported in Claes et al (2015;2017a;2017b), Della Porta et al (2015, Ronchi and Cruciani (2015), Soete et al (2015; and Mancini et al (2019a).…”

Section: Introductionmentioning

confidence: 99%

Fossil travertine system and its palaeofluid provenance, migration and evolution through time: Example from the geothermal area of Acquasanta Terme (Central Italy)

Janssens

Capezzuoli

Claes

et al. 2020

Sedimentary Geology

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The geothermal area of Acquasanta Terme has often been studied for its active and fossil travertine deposits to elucidate fluid origin, geodynamic and hydrological setting. Even though present-day thermal springs are usually used to obtain most information, the three travertine terraces bordering the Tronto river contain a plethora of information. A combination of elemental and isotope analyses (δ 18 O, δ 13 C and 87 Sr/ 86 Sr-ratio), fluid inclusion microthermometry and U-Th dating is used to verify the hydrogeology and its timing. These analyses point out two fluid reservoirs with distinctly different fluids, one with low salinity of 0.7 wt% NaCl eq. and another with 28.5 wt% NaCl eq., which corresponds to the fluid composition of present-day spring fluids. Furthermore, it is demonstrated that geothermal sources were intermittently active in the past 221 ka mainly during uneven-numbered marine isotope stages, which are related to humid, interglacial periods and resulted in three different travertine terraces around 210.5, 126.5, and 36.5 ka. Accordingly, an uplift rate for this area could be estimated at around 1 mm/ka. The fluids were tapped at a depth of approximately 3 km in the tectonized, cataclastic fraction of the Triassic Anidriti di Burano Formation, the Calcare Cavernoso Formation and are originally meteoric based on geochemical evidence of a uniform 87 Sr/ 86 Sr-ratio of 0.707914 ± 0.00019 and a δ 18 Oaragonite value of -11.90 ± 0.34 ‰, which has been depressed by elevated precipitation temperatures between 22.2 and 50 °C. The characterization and dating of fossil travertine deposits gives valuable data providing insights in long-term fluid flow and orogenic uplift rates, adding valuable information to present-day spring fluid characterization.

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South Atlantic Conjugate Margin: An Exploration Strategy

Cited by 8 publications

References 0 publications

3d Seismic Analysis of Cenozoic Slope Deposits and Fluid Flow Phenomena Along the Nigerian Transform Margin

3d Seismic Analysis of Cenozoic Slope Deposits and Fluid Flow Phenomena Along the Nigerian Transform Margin

Microbialitic deposits of the Yacoraite Formation, NW Argentina: distribution, environments, paleoecology, and economic implications

Fossil travertine system and its palaeofluid provenance, migration and evolution through time: Example from the geothermal area of Acquasanta Terme (Central Italy)

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