Riassunto analitico
ABSTRACT The Galicia passive margin was originated during Mesozoic times, due to continental rift and crustal extensional movements, from northwards propagation of the opening of the Atlantic Ocean (Druet and Martin 2015). During the Cenozoic times, the compressive tectonic related to the Pyrenean orogeny lead to the reactivation of pre-existing Mesozoic structures (Ercilla et al, 2008). As a result, elevation of basement block, faults systems, folds, tilted blocks took place westwards on the Galicia margin strongly influencing the sedimentary evolution (Vázquez et al. 2008). This margin is one of most investigated due to its special structural characteristics, specially centered on its Mesozoic extensional history. The study area investigated to realize this thesis is located in the Northwest sector of Iberia, It covers approximately 4590 km² of Galicia offshore. In order to reconstruct the evolution of the area, it has been realized an activity of seismic interpretation based on the recognition of seismic facies, identifying major seismic reflectors with Well data (Tops) present in the area.
To carry out this work I have been used 58 seismic sections on paper format, calibrated through 1 well. At the beginning, I have been identified the main seismic facies, in terms of geometry and termination of the reflectors, which were then calibrated through stratigraphic data from well. They have been recognized and tracked the "top" of Stratigraphics Units, as described on the well logs. The stratigraphics units recognized and afterward correlated with Well data, ordered from recent to oldest, are as follows: 1- Top Upper Cretaceous, 2- Top Aptian, 3- Top Hauterivian, 4- Top Valanginian, 5- Top Jurassic and 6- Top Basament. During the activity of interpretation, within these seismic stratigraphic units (Tops), were also recognized others 4 important reflectors to take into consideration which are tracked, includes also the recents surface coverage, that instead not crops out in the area where the well Pontevedra Marino B1 is located.
Regarding manual line drawing, I was used the software Opendtecht through which, it was possible to display both the Seismics sections and Well in Segy format. Once finished the interpretation of seismic profiles and tracking of the reflectors, was created a Grid related to the top of each Unit and each one has been possible to see the trend in the plant.
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Abstract
ABSTRACT
The Galicia passive margin was originated during Mesozoic times, due to continental rift and crustal extensional movements, from northwards propagation of the opening of the Atlantic Ocean (Druet and Martin 2015). During the Cenozoic times, the compressive tectonic related to the Pyrenean orogeny lead to the reactivation of pre-existing Mesozoic structures (Ercilla et al, 2008). As a result, elevation of basement block, faults systems, folds, tilted blocks took place westwards on the Galicia margin strongly influencing the sedimentary evolution (Vázquez et al. 2008). This margin is one of most investigated due to its special structural characteristics, specially centered on its Mesozoic extensional history.
The study area investigated to realize this thesis is located in the Northwest sector of Iberia, It covers approximately 4590 km² of Galicia offshore. In order to reconstruct the evolution of the area, it has been realized an activity of seismic interpretation based on the recognition of seismic facies, identifying major seismic reflectors with Well data (Tops) present in the area.
To carry out this work I have been used 58 seismic sections on paper format, calibrated through 1 well. At the beginning, I have been identified the main seismic facies, in terms of geometry and termination of the reflectors, which were then calibrated through stratigraphic data from well. They have been recognized and tracked the "top" of Stratigraphics Units, as described on the well logs.
The stratigraphics units recognized and afterward correlated with Well data, ordered from recent to oldest, are as follows:
1- Top Upper Cretaceous, 2- Top Aptian, 3- Top Hauterivian, 4- Top Valanginian, 5- Top Jurassic and 6- Top Basament.
During the activity of interpretation, within these seismic stratigraphic units (Tops), were also recognized others 4 important reflectors to take into consideration which are tracked, includes also the recents surface coverage, that instead not crops out in the area where the well Pontevedra Marino B1 is located.
Regarding manual line drawing, I was used the software Opendtecht through which, it was possible to display both the Seismics sections and Well in Segy format. Once finished the interpretation of seismic profiles and tracking of the reflectors, was created a Grid related to the top of each Unit and each one has been possible to see the trend in the plant.
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