| Autor: |
Marcela Lidia Fernandez, Julio Cesar S. de O. Lyrio, S.V. Yalamanchili, Luiz F. S. Braga, Alan Morgan |
| Rok vydání: |
2009 |
| Předmět: |
|
| Zdroj: |
SEG Technical Program Expanded Abstracts 2009. |
| DOI: |
10.1190/1.3255905 |
| Popis: |
Summary The results of integrated interpretation of newly acquired airborne gravity gradient and magnetic data with the existing seismic data from the Chirete Block, onshore northern Argentina are presented. Approximately 30,000 line km of magnetic data and 35,000 line km of gravity gradiometer data and 3675 square km of seismic data are utilized in this interpretation. The main project objective was to map the basement and associated major structural elements for the oil-and-gas prospect selection. 2D seismic depth sections were used as initial constraints for 2.5D and 3D gravity and magnetic modeling. Well log densities and velocities are also constrained in this modeling process. Several gravity and magnetic data enhancements were generated and used for mapping of tectonic framework. The basement depth estimates are computed from the total magnetic intensity profile data. The Werner, Euler, and Peters half slope techniques are used in basement depth computations as well as the depths to the magnetic sources within the sedimentary section. This interpretation was then refined by utilizing the gravity gradient data and seismic data using 2.5D and 3D modeling. The basement depths show significant variation from south to north and ranging approximately 4-13.5 km below sea level. The enhanced potential field data yielded basement faults and structural framework of the area. The general basement faults trends are striking mostly in ENE-WSW direction. Two major East-West faults were identified as being the major bounding faults of the Lomas de Olmedo rift. There exists a remarkable correlation between these faults derived independently from seismic reflection data and enhanced Airborne Gravity Gradiometry data. A number of positive structural features were identified with the associated faulting may provide leads for oil & gas exploration. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
