Seismic characteristics and distribution of hydrothermal vent complexes in the Cretaceous offshore rift section of the Campos Basin, offshore Brazil

Alvarenga, Renata dos Santos; Iacopini, David; Küchle, Juliano; Scherer, Claiton Marlon dos Santos; Goldberg, Karin

doi:10.1016/j.marpetgeo.2016.03.030

Cited by 46 publications

(25 citation statements)

References 16 publications

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“…This spatial association is unlike that of hydrothermal vents, which are most commonly associated with mafic sills (e.g. Svensen et al ., ; Planke et al ., ; Hansen., ; Grove, ; Magee et al ., ; Schofield et al ., ; Alvarenga et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…Bell & Butcher, ; Davies et al ., ; Thomson, ; Wall et al ., ; Calvès et al ., ; Jackson, ; Magee et al ., ; Zhao et al ., ; Schofield et al ., ) or hydrothermal in origin (e.g. Jamtveit et al ., ; Svensen et al ., ; Planke et al ., ; Hansen, ; Grove, ; Magee et al ., , b, ; Alvarenga et al ., ). However, the criteria for distinguishing these vents in seismic data were until now lacking.…”

Section: Introductionmentioning

confidence: 97%

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The architecture of submarine monogenetic volcanoes – insights from 3D seismic data

et al. 2017

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Many prospective sedimentary basins contain a variety of extrusive volcanic products that are ultimately sourced from volcanoes. However, seismic reflection-based studies of magmatic rift basins have tended to focus on the underlying magma plumbing system, meaning that the seismic characteristics of volcanoes are not well understood. Additionally, volcanoes have similar morphologies to hydrothermal vents, which are also linked to underlying magmatic intrusions. In this study, we use high resolution 3D seismic and well data from the Bass Basin, offshore southern Australia, to document 34 cone-and crater-type vents of Miocene age. The vents overlie magmatic intrusions and have seismic properties indicative of a volcanic origin: their moderate-high amplitude upper reflections and zones of "wash-out" and velocity pull-up beneath. The internal reflections of the vents are similar to those found in lava deltas, suggesting they are composed of volcaniclastic material. This interpretation is corroborated by data from exploration wells which penetrated the flanks of several vents. We infer that the vents we describe are composed of hyaloclastite and pyroclasts produced during submarine volcanic eruptions. The morphology of the vents is typical of monogenetic volcanoes, consistent with the onshore record of volcanism on the southern Australian margin. Based on temporal, spatial and volumetric relationships, we propose that submarine volcanoes can evolve from maars to tuff cones as a result of varying magma-water interaction efficiency. The morphologies of the volcanoes and their links to the underlying feeder systems are superficially similar to hydrothermal vents. This highlights the need for careful seismic interpretation and characterization of vent structures linked to magmatic intrusions within sedimentary basins.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

The architecture of submarine monogenetic volcanoes – insights from 3D seismic data

et al. 2017

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“…These alterations could be promoted by the focused circulation of deep-sourced fluids, which generated distinct hydrothermal alterations. Recently, Alvarenga et al (2016) recognized multiple hydrothermal vents in the rift section of central Campos Basin. Although lacking sampling of the most affected intervals, areas with intense dissolution were interpreted in the well logs and formation tests as probably related to hypogenic hydrothermal karst (cf.…”

Section: Hydrothermal and Mesogenetic Alterationsmentioning

confidence: 99%

Influence of Diagenesis On the Quality of Lower Cretaceous Pre-salt Lacustrine Carbonate Reservoirs from Northern Campos Basin, Offshore Brazil

Herlinger

Zambonato

Ros

2017

Journal of Sedimentary Research

158

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The genesis and evolution of lacustrine pre-salt carbonate reservoirs, which contain giant hydrocarbon accumulations along the South Atlantic margins, has attracted major research interest. The huge extension and volume, and unusual textural and compositional features, are key elements for understanding the tectonic, structural, stratigraphic, and sedimentological generation and early evolution of the region, as well as potentially of other lacustrine carbonate systems. A systematic petrographic and petrophysical study has been performed on the Lower Cretaceous lacustrine carbonate reservoirs from northern Campos Basin, Offshore Brazil, in order to unravel the main controls on the origin and evolution of pore systems. The main lithologic types recognized in the rift section are bivalve-gastropod grainstones and rudstones, arenites constituted by ooids of syngenetic magnesian clay minerals (mostly stevensite), and dolostones, while stevensitic claystones with calcite spherulites, fascicular calcite crusts, intraclastic rudstones and grainstones, and dolostones are the main lithologic types in the sag section. The eogenetic evolution of bioclastic reservoirs was controlled by the balance between dissolution and neomorphism of the aragonitic bivalve and gastropod bioclasts, favoring either the generation of poorly connected moldic porosity or the preservation of well-connected interparticle porosity. The stevensitic arenites were strongly affected by meteoric dissolution and replacement by dolomite and silica, related to regional uplift and erosion after the rift phase, which generated highly heterogeneous pore systems with moldic, intercrystalline, vugular, and microcrystalline pores. Stevensitic claystones that are replaced by calcite spherulites and dolomite normally show low porosity, but locally constitute reservoirs, where secondary porosity was generated by stevensite dissolution. The precipitation of crystal shrubs of fascicular-optic calcite in coalescent crusts generated growth-framework primary porosity, which was reduced mostly by dolomite cementation, or enlarged by dissolution, enhancing their permeability. Non-coalescent calcite crusts contain abundant syngenetic magnesian clay minerals. Their porosity is related to dissolution of these clays, which generated poor permeability. Intraclastic grainstones and rudstones are compacted and cemented, or rich in clay matrix (''hybrid packstones''). Where they display preserved interparticle primary porosity or matrix dissolution, they may have good porosity and permeability. The heterogeneous dolomitization of both the rift and the sag deposits either destroyed their primary or early diagenetic porosity, or generated high porosity and permeability values in the dolostones. Relationships between replacement and compaction indicate that most of the diagenetic processes occurred during eodiagenesis, controlled mostly by the instability of the aragonite in the bioclastic reservoirs and of the stevensite in the claystones, ooidal arenites, and fascicular calcite c...

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“…In recent years, the exploration of volcanic rocks has received more and more attention (M. Li, Zou, & Liu, ; Pu, Zhong, & Zhang, ; Yang, Zhang, Liu, Wen, & Xu, ; C. Zhang, Shi, & Wu, ; Zhu, ; Zou et al, ). For identification of volcanic cones or volcanic rocks, previous research on this subject (Y. Li, He, & Liu, ) mainly used the seismic facies characteristic (Y. Feng et al, ; Qin, Wei, & Zhang, ; Yu, ), seismic attribute analysis (J. Wu et al, ; Zhu, ), coherent analysis (Guo et al, ), and other methods (Alvarenga, Iacopini, Kuchle, Scherer, & Goldberg, ; Z. Q. Feng, ; Malehmir & Bellefleur, ). However, these studies were subject to the quality of seismic data and often had to constrain a large amount of well data (Shi et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Feng et al, 2016;Qin, Wei, & Zhang, 2016;Yu, 2008), seismic attribute analysis (J. Wu et al, 2012;Zhu, 2013), coherent analysis (Guo et al, 2016), and other methods (Alvarenga, Iacopini, Kuchle, Scherer, & Goldberg, 2016;Z. Q. Feng, 2008;Malehmir & Bellefleur, 2009).…”

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confidence: 99%

Identification method and distribution of palaeovolcanoes in Mulei Depression in the Junggar Basin, Western China

2019

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case of minimal well information available, we identify the volcanoes of the Upper Carboniferous Bashan Formation of the Mulei Depression and clarify its distribution characteristics. Through frequency decomposition and a reconstruction of seismic data, the seismic reflection characteristics of the ancient volcanic cone become prominent and easy to identify, and even the period of some stacked volcanic cones can be divided. According to the geological model put forward, the seismic reflection characteristics of the ancient volcanic cone and its surrounding volcanic rocks are clarified. The volcanic cones are characterized by mound-clutter and weak-blank amplitude reflection. The internal clutter mainly have resulted from rapid changes in lithology and complex secondary faults. Away from the crater direction, the energy of a seismic event is gradually enhanced, and the volcanic sediments from other sources will be superimposed above the previously formed volcanoes. It is found that the volcanic channel with a short-axis continuous illusion is often developed at the bottom. The volcanic channel which can be identified in seismic mainly affects the development of large volcanoes. Finally, 27 volcanic cones and seven volcanic channels were identified via establishing the threedimensional (3D) model of the volcano and the amplitude of the root mean square of seismic data after reconstruction, as well as interpreting deep faults. The volcanic development in the Mulei Depression has the characteristics of an NE spread along deep faults and northern more than southern.

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Seismic characteristics and distribution of hydrothermal vent complexes in the Cretaceous offshore rift section of the Campos Basin, offshore Brazil

Cited by 46 publications

References 16 publications

The architecture of submarine monogenetic volcanoes – insights from 3D seismic data

The architecture of submarine monogenetic volcanoes – insights from 3D seismic data

Influence of Diagenesis On the Quality of Lower Cretaceous Pre-salt Lacustrine Carbonate Reservoirs from Northern Campos Basin, Offshore Brazil

Identification method and distribution of palaeovolcanoes in Mulei Depression in the Junggar Basin, Western China

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