Stages of Mesozoic Rifting, Magmatism, and Salt Deposition in the Eastern Gulf Of Mexico Inferred from a Grid of Deep-Penetration Seismic Reflection Data

2014 ◽  
Author(s):  
Murad Hasan ◽  
Paul Mann
Keyword(s):  
Gulf Of Mexico ◽  
Seismic Reflection ◽  
Deep Penetration ◽  
Seismic Reflection Data ◽  
Salt Deposition ◽  
Reflection Data ◽  
Eastern Gulf Of Mexico

Spherical divergence correction for seismic reflection data using slant stacks

Geophysics ◽  
1989 ◽  
Vol 54 (5) ◽  
pp. 563-569 ◽  
Author(s):  
David Y. Wang ◽  
Douglas W. McCowan
Keyword(s):  
Gulf Of Mexico ◽  
Seismic Reflection ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Spherical Divergence

We have developed a method for the spherical divergence correction of seismic reflection data based on normal moveout and stacking of cylindrical slant stacks. The method is illustrated on some Gulf of Mexico data. The results show that our method yields essentially the same traveltime information as does conventional processing. Our amplitudes, however, are more interpretable in terms of reflectivity than are those obtained by using an empirical spherical divergence correction.

scholarly journals SALT WELDING DURING CANOPY ADVANCE AND SHORTENING IN THE GREEN CANYON AREA, NORTHERN GULF OF MEXICO

2021 ◽  
Author(s):  
Christopher Jackson ◽  
Sian Evans ◽  
Turki Alshammasi
Keyword(s):  
Gulf Of Mexico ◽  
Seismic Reflection ◽  
Analytical Models ◽  
3D Seismic ◽  
Borehole Data ◽  
Seismic Reflection Data ◽  
Northern Gulf Of Mexico ◽  
Reflection Data ◽  
Tectonic System ◽  
Migration Pathways

Welds form due to the tectonically-induced thinning and/or dissolution of salt, with their composition and completeness thought to at least partly reflect their structural position within the salt-tectonic system. Despite their importance as seals or migration pathways for accumulations of hydrocarbons and CO2, we have relatively few examples of drilled subsurface welds; such examples would allow us to improve our understanding of the processes and products of welding, and to test analytical models of the underlying mechanics. In this study we integrate 3D seismic reflection and borehole data from the Green Canyon Area of the northern Gulf of Mexico, USA to characterize the geophysical and geological expression of a tertiary weld, as well as its broader salt-tectonic context. These data show although it appears complete on seismic reflection data, the weld contains 124 ft (c. 38 m) of pure halite. This thickness is consistent with the predictions of analytical models, and with observations from other natural examples of subsurface welds. Our observations also support a model whereby compositional fractionation of salt occurs as the salt-tectonic system evolves; in this model, less mobile and/or denser units are typically stranded within the deeper, autochthonous level, trapped in primary welds, or stranded near the basal root of diapirs, whereas less viscous and/or less dense units form the cores of these diapirs and, potentially, genetically related allochthonous sheets and canopies. We also show that shearing of the weld during downslope translation of the overlying minibasin did not lead to complete welding.

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