13 research outputs found
Cuantificaci贸n del crecimiento de pliegues con sedimentos sintect贸nicos asociados: aplicaci贸n al anticlinal de Santar茅n (or贸geno cubano, cuenca de antepa铆s de las Bahamas)
The Santaren anticline, located offshore, is the outermost structure of the Cuban fold and thrust belt. The detailed study of the geometry of the syntectonic sediments associated with this anticline has allowed us to document its kinematic evolution. A number of reverse modelling geometrical techniques have been used to quantify fold gr owth (crestal structural relief, shortening, limb dip, interlimb angle and axial plane dip) during different stages. The values obtained for each of these parameters have been plotted versus time in order to s h ow their evolution through time. The conclusions achieved from all these plots are consistent and enable us to understand how fold amplification took place. Thus, the data obtained indicate that fold gr owth initiated during Middle Eocene, or before, and it continued until present day. Fold amplification took place at extremately slow rates from Middle Miocene to present day, and perhaps faster during deposition of older growth strata. In particular, data concerning rotation of the southern limb and interlimb angle tightening support this hypothesis. The data presented in this paper regarding the Santaren anticline evolution disagree with previous plate tectonic models that postulate the end of tectonic activity in this region during Middle Eocene
Cuantificaci贸n del crecimiento de pliegues con sedimentos sintect贸nicos asociados: aplicaci贸n al anticlinal de Santar茅n (or贸geno cubano, cuenca de antepa铆s de las Bahamas)
El estudio detallado de la geometr铆a de los sedimentos sintect贸nicos asociados al crecimiento del anticlinal de Santaren, localizado bajo el mar en la parte m谩s externa de la faja plegada cubana, ha permitido documentar la evoluci贸n cinem谩tica de dicho pliegue.
Para ello se han utilizado una serie de t茅cnicas geom茅tricas de modelizaci贸n inversa que permiten cuantificar el crecimiento del pliegue en funci贸n de: el relieve estructural de la cresta, el acortamiento, el buzamiento de los flancos, el 谩ngulo entre flancos y el buzamiento del plano axial para diferentes estadios durante el dep贸sito de los sedimentos sintect贸nicos. Para cada uno de los par谩metros, los valores obtenidos se representan en una gr谩fica con respecto a la edad correspondiente, y de esta manera se conoce su evoluci贸n a trav茅s del tiempo.
Las conclusiones que se obtienen a partir de las diferentes gr 谩 ficas son coherentes entre s铆 y permiten vislumbrar datos importantes de la evoluci贸n del pliegue. As铆, los resultados obtenidos indican que el anticlinal se inici贸 en el Eoceno Medio, o anteriormente, y su crecimiento perdur贸 hasta la actualidad. El anticlinal creci贸 de forma extremadamente lenta a partir del Mioceno Medio y tal vez lo hizo de forma mas r谩pida durante el dep贸sito de los sedimentos sintect贸nicos m谩s antiguos.
En particular, los datos sobre la rotaci贸n del flanco sur del anticlinal y sobre la variaci贸n del 谩ngulo entre flancos parecen estar de acuerdo con esta 煤ltima hip贸tesis. Estos nuevos datos sobre la evoluci贸n del anticlinal de Santaren contradicen modelos previos que postulan que la deformaci贸n en esta regi贸n culmin贸 en el Eoceno Medio.The Santaren anticline, located offshore, is the outermost structure of the Cuban fold and thrust belt. The detailed study of the geometry of the syntectonic sediments associated with this anticline has allowed us to document its kinematic evolution. A number of reverse modelling geometrical techniques have been used to quantify fold gr owth (crestal structural relief, shortening, limb dip, interlimb angle and axial plane dip) during different stages. The values obtained for each of these parameters have been plotted versus time in order to s h ow their evolution through time.
The conclusions achieved from all these plots are consistent and enable us to understand how fold amplification took place. Thus, the data obtained indicate that fold gr owth initiated during Middle Eocene, or before, and it continued until present day. Fold amplification took place at extremately slow rates from Middle Miocene to present day, and perhaps faster during deposition of older growth strata.
In particular, data concerning rotation of the southern limb and interlimb angle tightening support this hypothesis. The data presented in this paper regarding the Santaren anticline evolution disagree with previous plate tectonic models that postulate the end of tectonic activity in this region during Middle Eocene
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Seismic imaging of carbonate reservoirs and systems
Recent advances in seismic acquisition, processing and visualization techniques image carbonate strata with unprecedented resolution. This volume documents the current state of the art in seismic imaging and interpreting of carbonate systems and captures the dynamics of the carbonate system on a large exploration scale and on a small reservoir scale. The book emphasizes the newest approaches in seismic visualization, seismic sedimentology and stratigraphy, seismic attribute analysis and their application for building improved 3-D reservoir models. Among the topics covered are the delineation of the complex histories of carbonate platform sequences from seismic data, the relationships between geometries and forming processes, the imaging of faults for improved mapping of potential fluid migration pathways, and use of seismic attributes for the extraction of rock properties in the sedimentary bodies. The book illustrates the power of integrating seismic and geological data to better predict of the architecture and heterogeneities in carbonate depositional systems. As such the book will be a useful reference for both geologists and geophysicists
Cuantificaci贸n del crecimiento de pliegues con sedimentos sintect贸nicos asociados: aplicaci贸n al anticlinal de Santar茅n (or贸geno cubano, cuenca de antepa铆s de las Bahamas)
El estudio detallado de la geometr铆a de los sedimentos sintect贸nicos asociados al crecimiento del anticlinal de Santaren, localizado bajo el mar en la parte m谩s externa de la faja plegada cubana, ha permitido documentar la evoluci贸n cinem谩tica de dicho pliegue. Para ello se han utilizado una serie de t茅cnicas geom茅tricas de modelizaci贸n inversa que permiten cuantificar el crecimiento del pliegue en funci贸n de: el relieve estructural de la cresta, el acortamiento, el buzamiento de los flancos, el 谩ngulo entre flancos y el buzamiento del plano axial para diferentes estadios durante el dep贸sito de los sedimentos sintect贸nicos. Para cada uno de los par谩metros, los valores obtenidos se representan en una gr谩fica con respecto a la edad correspondiente, y de esta manera se conoce su evoluci贸n a trav茅s del tiempo. Las conclusiones que se obtienen a partir de las diferentes gr谩ficas son coherentes entre s铆 y permiten vislumbrar datos importantes de la evoluci贸n del pliegue. As铆, los resultados obtenidos indican que el anticlinal se inici贸 en el Eoceno Medio, o anteriormente, y su crecimiento perdur贸 hasta la actualidad. El anticlinal creci贸 de forma extremadamente lenta a partir del Mioceno Medio y tal vez lo hizo de forma mas r谩pida durante el dep贸sito de los sedimentos sintect贸nicos m谩s antiguos. En particular, los datos sobre la rotaci贸n del flanco sur del anticlinal y sobre la variaci贸n del 谩ngulo entre flancos parecen estar de acuerdo con esta 煤ltima hip贸tesis. Estos nuevos datos sobre la evoluci贸n del anticlinal de Santaren contradicen modelos previos que postulan que la deformaci贸n en esta regi贸n culmin贸 en el Eoceno Medi
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Effects of Porestructure On Sonic Velocity In Carbonates
The presence of round pores generally causes a positive deviation from Wyllie's equation (Anselmetti and Eberli 1993, 1999; Saleh and Castagna 2004). However, carbonates contain a large number of different pore types that are not related roundness alone. Three quantitative pore shape parameters derived from digital image analysis are introduced to capture the complicated pore structure of carbonates with the goal to enhance porosity prediction from velocity. The first parameter that describes the roundness of the pores was first introduced by Anslemetti et al. (1998) and called 纬. The second parameter Perimeter-over-Area (PoA) captures the overall tortuosity of the pores system. The third parameter, Dominant Poresize, is a measure of the dominant pore size within the thin section. Out of these three parameters, PoA is the most dominant factor controlling velocity at a given porosity with Dominant Poresize being second, while roundness alone is the least important factor of the three. We conclude that the roundness of individual pores is not as relevant as the simplicity of the pore system, i.e, the pore system with low tortuosity. Combining all three parameters and porosity in a multivariate linear regression increases correlation to velocity from R 2 of 0.49 (porosity alone) to R 2 of 0.78