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Integrated Structural-Geophysical Analysis
Andean Forearc, Inter-Andean, and Foreland basins are characterized by complex compressional structures that often
involve crystalline basement rocks. The approach being used in these basin studies is to develop volume-balanced
structural models, based on the surficial geology, well logs, and seismic reflection profiles. The balanced geological
models are then iteratively modified to satisfy the potential field data. Gravity and magnetic studies can play an important
role in the initial as well as ongoing assessment of basin structure. Potential field data can provide the regional setting
for basins and constrain models of deep basin geometry, especially in areas of basement-involved deformation. For
example, we used the gravity and magnetic fields to predict the depth of the Cretaceous Basin within the Colombian Eastern
Cordillera and marginal structures, a critical problem for interpretation of the structural evolution and prospectivity
of the mountain range. Recent projects have been funded by the Petroleum
Research Fund of the American Chemical Society, and the sponsors of the
Colombian, Peru and Bolivia Geophysical Projects: BP-Amoco-Arco,
Chevron-Texaco, Coastal Oil & Gas,
Crestar, Ecopetrol, Elf-Aquitaine, ExxonMobil, Nexen, Occidental, Pecten-Shell, Perupetro,
Pluspetrol, Triton, Unocal,
and Yacimientos Petroliferos Fiscales Bolivianos (YPFB).
Consulting
 Regional Studies
The Andean Geophysical Laboratory is available to design new regional
geophysical projects in addition to the already completed PGP, BGP and CGP.
Products
 Potential Field Maps (Arc/Info & Gipsi)
- Merge (Compu-Drape, GRAVMAG)
- Complete Bouguer
- Free Air
- Regional
- Residual
- Total Field
- Derivative
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Geological and Seismic Interpretations
- Pseudo-Balanced Geologic Time Section (LANDMARK)
- Balanced Depth Sections (Geosec 2D, VoxelGeo 3D)
- 2-D and 3-D Density and Magnetic Susceptibility Models (GM-SYS)
- Retrodeformed Sections (Move-on-Fault, 3-D Move)
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Interpretive Maps
- Euler Deconvolution (GRIDEPTH)
- Structural Interpretation of Euler Trends (GRIDEPTH)
- Structure
- Prospective Areas
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Report with Data CD
Short Courses
- Construction and Evaluation of Volume-Balanced Geological Cross Sections
- Structural Styles and Tectonic History of North Andean Basins (Eastern Cordillera, Foothills, Magdalena,
Cesar, Maracaibo)
- Plate Tectonic Evolution of the Northern Andes
- Potential Field Data and Basin Geometry in the Northern Andes
Courses Offered by J.N. Kellogg at USC
GEOL 899 - Dissertation Preparation. (1-12)
GEOL 819 - Seminar in Tectonophysics. (2) (Prereq.: consent of instructor) Readings and discussion on current tectonophysical
problems.
GEOL 818 - Seminar in Geophysics. (2) Seminar related to current topics in geophysics.
GEOL 799 - Thesis Preparation. (1-9)
GEOL 790 - Directed Individual Studies in Geology. (1-6 to be designated at registration) Directed research topics to be
individually assigned and supervised by graduate faculty.
GEOL 764 - Seismic Reflection Interpretation. (3) The interpretation of regional stratigraphy and structure using seismic sections.
Recognition of stratigraphic sequences, sedimentary facies, and extensional and compressional structures. Application to
hydrocarbon exploration.
GEOL 531 - Plate Tectonics. (3) Geological and geophysical evidence for plate tectonics, detailed development of the plate
tectonics model, and present areas of research, including measurements of plate motion using satellite geodesy. Three
lecture-discussion hours per week.
GEOL 200 - Selected Topics in Geology. (1 each; 8 maximum) A series of courses each lasting one-third of a semester. Topics
are announced in the class schedule for each semester. A maximum of three credits can be applied to Group V requirements
in the Colleges of Liberal Arts and Science and Mathematics.
GEOL 103 - Environment of the Earth. (4) Analysis of the basic energy cycles of the earth. The interaction of human activity with
earth processes to affect the environment. Three lectures and three laboratory hours each week.
GEOL 101 - Introduction to the Earth. (4) Origin and nature of the earth with emphasis on internal processes and phenomena such
as earthquakes, volcanoes, and mountain building; surface processes, including landform evolution. Three lectures and three
laboratory hours each week.
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