Salt Tectonics Comparisons Near Three Continent-Ocean Boundary Escarpments

Fainstein, Roberto; Krueger, Ana

doi:10.5724/gcs.05.25.0510

Cited by 8 publications

(3 citation statements)

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“…Similar to the Camamu-South Gabon conjugate basins (Figure 3a), the conjugate transects along the Espírito Santo-Kwanza basins ( Figure 6) indicate narrow/wide conjugate margin configuration. Farther oceanward from the COB, the conjugate transects are characterized by very similar allochthonous salt tongues that are advancing toward the oceanic crust [Fainstein and Krueger, 2005]. In addition, the COB is associated with a positive magnetic and gravimetric anomaly (Figures 4a,5,and 6).…”

Section: Continent-ocean Transitional Domainmentioning

confidence: 88%

Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

Blaich¹,

Faleide²,

Tsikalas³

2011

J. Geophys. Res.

151

174

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[1] Seismic reflection and refraction profiles, and potential field data, complemented by crustal-scale gravity modeling and plate reconstructions are used to study the evolution of the central and south segments of the South Atlantic conjugate margins. The central segment is characterized by a hyperextended continent-ocean transitional domain that shows evidence of rotated fault blocks and a detachment surface active during rifting. A polyphase rifting evolution mode, associated with a complex time-dependent thermal structure of the lithosphere, is substantiated for the central segment that is not a "magma-poor" end-member. Increase of volcanic activity during the late stages of rifting may have "interrupted" the extensional system implying a failed exhumation phase that was replaced instead by continental breakup and emplacement of fully igneous crust. The continent-ocean transitional domain along the "magma-dominated" south segment is characterized by a large volume of flood basalts and high-velocity/high-density lower crust. The northern province of the south segment is characterized by symmetrical seaward-dipping reflections and symmetrical continent-ocean transitional domain. The influence of the Tristan da Cunha plume on this province is very likely. The central province of the south segment is characterized by along-strike tectonomagmatic asymmetry, which can be caused by the initial continental stretching and accompanying magmatism rather than by the subsequent seafloor spreading. The Tristan da Cunha plume on the central province may have influenced the volume of magmatism but did not necessarily alter the process of rifted margin formation, implying that the central province of the south segment may have much in common with "magma-poor" margins.

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Section: Continent-ocean Transitional Domainmentioning

confidence: 88%

Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

Blaich¹,

Faleide²,

Tsikalas³

2011

J. Geophys. Res.

151

174

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“…Sub-basalt exploration is worthwhile because basalt-covered basins have demonstrated their ability to hold and produce hydrocarbons (for example, Faroe-Shetland, Columbia River, Paraná Basin, Deccan Traps). In fact, the potential for exploration under basalt cover can reach 800 Tcf gas and 30 billion barrels of oil [27]. Worldwide sub-basalt stratigraphic modeling in detail may provide accurate visualization of the presence of petroleum systems underneath the basalt cover [28].…”

Section: Discussionmentioning

confidence: 99%

A Hydrocarbon Resource Plays in Southern Pakistan´s Indus Basin

Shahzad¹,

Reis²,

Henriques³

2022

Preprint

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Due to the use of structural and seismic techniques an attempt has been made in this study to determine the hydrocarbon potential and future exploration in Pakistan's Lower Indus basin area and offshore region. In addition to the possibility of hydrocarbon accumulation, the major goals of this research are to analyze structural patterns in the subsurface of the study region, identify the horizons of various formations using surface seismic, and interpret seismic lines. Seismic data has been used to find and integrate the exposed Cretaceous/Tertiary basalt at Ranikot in the lower Indus basin to the well-known Deccan basalts of the Indo-Pak plate, which is the secondary goal of the current investigation. According to the interpretation of seismic data, the Indo-Pakistan plate has experienced rifting because of tectonic activity. Graben and horst structures have been identified in the study area horizon, which indicates that the area has undergone major structural and depositional changes. While faults provide a pathway for hydrocarbons to migrate from their source to reservoir rock, grabens are principally responsible for the accumulation of hydrocarbons. We further deduce that the prior exploration failures in the area were due to a lack of knowledge of the subsurface formations and structural trends, which are essential for characterizing the hydrocarbon play and trap features. Our results can be productive for the local hydrocarbon drilling projects as well as worldwide tectonic stratigraphy studies on passive continental edges.

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“…In the South Atlantic the Albian-Aptian salt basins evolved north to the Rio Grande Rise -Walvis Ridge volcanic highs and south to the equatorial fracture zones (Bryant et al;. By and large most of the important deep-water fields worldwide are situated in the salt basins, these include fields with mostly turbidite reservoirs in the post-salt and sub-salt (GoM) post-rift and mostly microbialite reservoirs in the syn.rift pre-salt (Fainstein and Krueger, 2005;Fainstein and Mohriak, 2015). Still, in the transform margin Gulf of Guinea, significant discoveries have been made in Nigeria (Bonga and Owowo) and in Ghana (Jubilee).…”

Section: Offshore Deepwater Basins -Plate Tectonicsmentioning

confidence: 99%

Seismic Technology - Offshore Exploration and Production

Fainstein¹,

Tygel²

2018

Proceedings of the VIII Simpósio Brasileiro E Geofísica

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Systematic offshore exploration began as a natural extension of its onshore counterpart the continental margin basins where many of the larger hydrocarbon fields were already developed with the main aspects of petroleum systems already established. The geophysical seismic technology needed for the mapping of offshore prospects progressed in tandem with marine drilling operations in this new exploration perspective of prospect mapping without geologic outcrops. This paper establishes the close relationship between seismic images evolution with hydrocarbon developments in the marine environment. As such it briefly describes the history of offshore hydrocarbon discoveries and the impact of geophysics technology for the offshore assessment of exploration and development activities, focusing into the description of the main aspects and history development of offshore drilling, offshore seismic data seismic acquisition, dat6a processing and the main aspects in the evolution of seismic structural and stratigraphic interpretation to present wide utilization of workstations with interpretive software.

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Salt Tectonics Comparisons Near Three Continent-Ocean Boundary Escarpments

Cited by 8 publications

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Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

A Hydrocarbon Resource Plays in Southern Pakistan´s Indus Basin

Seismic Technology - Offshore Exploration and Production

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