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Leonardo Azevedo is an assistant professor with habilitation in the Department of Civil Engineering, Architecture, and Georesources at the Institute Tecnico, Lisboa, Portugal. He is a rarity in the applied-geophysics community in that he has demonstrated a talent for integrating geostatistics into a wide range of geophysics applications. His primary focus has been geostatistical application to seismic amplitude variation with offset inversion and uncertainty in nonlinear geophysical problems. Azevedo has authored more than 42 peer-reviewed papers and accumulated an h-index of 14 at this early stage in his career. Not only has be contributed to energy exploration applications, but he is also engaged in hydrogeophysics research and the application of near-surface geophysics for landfill characterization and risk assessment.
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Information Technology > Knowledge Management (0.76)
- Information Technology > Communications > Collaboration (0.76)
The subject of Differential geometry[1][2] is the application of calculus to the problem of describing curves, surfaces, and volumes in two and three dimensions, as well as analogous structures in higher dimensions. The most immediate application of differential geometry in geophysics is the representation of curves and surfaces in geologic models. Seismic ray tracing is an application as well, as are the other geometric aspects of solutions to partial differential equations, such as field lines and flow lines in problems from potential theory and from fluid dynamics. This exposition begins in 3 dimensions, but all of the results presented here generalize immediately to arbitrary dimensions. In Failed to parse (SVG with PNG fallback (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") Failed to parse (SVG with PNG fallback (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.")
- Information Technology > Knowledge Management (0.76)
- Information Technology > Communications > Collaboration (0.76)
The subject of Differential geometry[1][2] is the application of calculus to the problem of describing curves, surfaces, and volumes in two and three dimensions, as well as analogous structures in higher dimensions. The most immediate application of differential geometry in geophysics is the representation of curves and surfaces in geologic models. Seismic ray tracing is an application as well, as are the other geometric aspects of solutions to partial differential equations, such as field lines and flow lines in problems from potential theory and from fluid dynamics. This exposition begins in 3 dimensions, but all of the results presented here generalize immediately to arbitrary dimensions. You can think of this as being like the marks on a tape measure. The last form with subscript i {\displaystyle i} is index notation. Here we use the "." to indicate differentiation with respect to this special coordinate s {\displaystyle s} . Thus s {\displaystyle s} is arc length.
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
Specification must give a distinctive name and specify the distinguishing gross lithologic characteristics, the type location, how the boundaries are specified, how the units are subdivided, their thicknesses and thickness ranges, how they are geographically distributed, and their age. See Salvador (1994) and Hedburg (1976).
- Geology > Rock Type (0.65)
- Geology > Geological Subdiscipline > Stratigraphy > Lithostratigraphy (0.56)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.65)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (0.56)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
Geochronology is the science of determining the age of rock formations and their associated geological events. Geochronology is important in the geosciences because it allows the quantification of the changes that occur across the landscape such as depositional timing, paleogeography, basin development, sediment provenance, and much more. There are many different dating methods that can be used to determine the age of rocks, fossils, and sediments, and the advancement of modern technology is allowing faster determination of more accurate age measurements. The ages can be determined either absolutely using radioactive isotopes or relatively using dating methods such as index fossils, global stable isotopic trends, and paleomagnetism. Geochronology, biostratigraphy, and chronostratigraphy are all closely related disciplines and are commonly applied towards the same problems.
- Geology > Geological Subdiscipline > Geochronology (1.00)
- Geology > Geological Subdiscipline > Stratigraphy > Chronostratigraphy (0.37)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
The Chicxulub crater is a 145 km wide depression in subsurface of the northwestern Yucatan Peninsula of Mexico. It is thought to be the result of an asteroid impact approximately 65.5 Ma., dating at around the same time as the Cretaceous-Paleogene (K/T) extinction event. This mass extinction resulted in the loss of roughly 75% or plant and animal life on Earth, including non-avian dinosaurs. The impact crater formed a sedimentary basin that allowed for deposition and diagenesis to occur throughout the Cenozoic Era. Seismic images have described the structure as a circular depression, complete with annular troughs and peak ring, similar in structure to craters seen on the Moon and Mars.
- Phanerozoic > Cenozoic > Paleogene > Eocene (0.36)
- Phanerozoic > Cenozoic > Neogene > Miocene (0.33)
- Geology > Sedimentary Geology (1.00)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (0.31)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
Interpret the seismic section shown in Figure 10.15a. The most striking feature of this section is probably the progradational pattern A A ′ {\displaystyle AA'} indicating a source to the right of the section. Note that these prograding reflections are more continuous at the right and left sides of the section than in the region under the surface channel. There may also be a slight sag in reflections under the channel, and they suffer similar quality deterioration. An interpreter would not interpret these quality changes as having stratigraphic significance.
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.47)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (0.40)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
Removal of opacity is applied to either a horizontal time slab with a specified thickness, typically a few to tens of time samples, or to a depositional unit bounded by the time horizons derived from structural interpretation. Figure 7.5-29 shows opacity removal applied to a thin horizontal slab that includes the water bottom, the horizontal slab slightly deeper than the water bottom, and the depositional unit labeled as H1 in Figure 7.5-28. Note the enhanced images of a complex channel system at the water bottom, and the intensive fracture system that begins to develop immediately below the water bottom and increases in complexity as we go deeper in the image volume. When we reach horizon H3 as labeled in Figure 7.5-28, we observe a highly complex fault system (Figure 7.5-30). Now we look inside a specific depositional unit, in this case the unit bounded by horizon H3 on top as labeled in Figure 7.5-28.
- Information Technology > Knowledge Management (0.40)
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